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Title: Intruder Configurations Of Excited States In The Neutron-rich Isotopes P-33 And P-34.
Creator: Lubna, R. S., Tripathi, Vandana, Tabor, S. L., Tai, P.-L., Kravvaris, K., Bender, P. C., Volya, A., Bouhelal, M., Chiara, C. J., Carpenter, M. P., Janssens, R. V. F., Lauritsen,...
Show moreLubna, R. S., Tripathi, Vandana, Tabor, S. L., Tai, P.-L., Kravvaris, K., Bender, P. C., Volya, A., Bouhelal, M., Chiara, C. J., Carpenter, M. P., Janssens, R. V. F., Lauritsen, T., McCutchan, E. A., Zhu, S., Clark, R. M., Fallon, P., Macchiavelli, A. O., Paschalis, S., Petri, M., Reviol, W., Sarantites, D. G.
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Abstract/Description: Excited states in the neutron-rich isotopes P-33 and P-34 were populated by the O-18 + O-18 fusion-evaporation reaction at E-lab = 24 MeV. The Gammasphere array was used along with the Microball particle detector array to detect gamma transitions in coincidence with the charged particles emitted from the compound nucleus S-36. The use of Microball enabled the selection of the proton emission channel. It also helped in determining the exact position and energy of the emitted proton; this was...
Show moreExcited states in the neutron-rich isotopes P-33 and P-34 were populated by the O-18 + O-18 fusion-evaporation reaction at E-lab = 24 MeV. The Gammasphere array was used along with the Microball particle detector array to detect gamma transitions in coincidence with the charged particles emitted from the compound nucleus S-36. The use of Microball enabled the selection of the proton emission channel. It also helped in determining the exact position and energy of the emitted proton; this was later employed in kinematic Doppler corrections. 16 new transitions and 13 new states were observed in P-33 and 21 gamma rays and 20 energy levels were observed in P-34 for the first time. The nearly 4 pi geometry of Gammasphere allowed the measurement of gamma-ray angular distributions leading to spin assignments for many states. The experimental observations for both isotopes were interpreted with the help of shell-model calculations using the (0+1)(h) over bar omega PSDPF interaction. The calculations accounted for both the 0p-0h and 1p-1h states reasonably well and indicated that 2p-2h excitations might dominate the higher-spin configurations in both P-33 and P-34.
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Date Issued: 2018-04-16
Identifier: FSU_libsubv1_wos_000430060300003, 10.1103/PhysRevC.97.044312
Format: Citation

Title: Exclusive Photoproduction Of Pi Degrees Up To Large Values Of Mandelstam Variables S, T, And U With Clas.
Creator: Kunkel, M. C., Amaryan, M. J., Strakovsky, I. I., Ritman, J., Goldstein, G. R., Adhikari, K. P., Adhikari, S., Avakian, H., Ball, J., Balossino, I., Barion, L., Battaglieri, M.,...
Show moreKunkel, M. C., Amaryan, M. J., Strakovsky, I. I., Ritman, J., Goldstein, G. R., Adhikari, K. P., Adhikari, S., Avakian, H., Ball, J., Balossino, I., Barion, L., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bultmann, S., Burkert, V. D., Cao, F., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Degtyarenko, P., Defurne, M., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fersch, R., Filippi, A., Fradi, A., Gavalian, G., Ghandilyan, Y., Ghosh, S., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Glazier, D., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Guidal, M., Hafidi, K., Hakobyan, H., Harrison, N., Hattawy, M., Hicks, K., Holtrop, M., Hyde, C. E., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Joo, K., Kabir, M. L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F., Kubarovsky, V., Kuhn, S. E., Laget, J. M., Lanza, L., Lenisai, P., Lersch, D., Livingston, K., Macgregor, I. J. D., Markov, N., Njencheu, G. Mbianda, Mckinnon, B., Mineeva, T., Mokeev, V., Montgomery, R. A., Movsisyani, A., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidovi, A., Paolone, M., Park, K., Pasyuk, E., Payette, D., Phelps, W., Pogorelko, O., Poudel, J., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Roy, A., Sabatie, F., Salgado, C., Schadmand, S., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu, Stepanyan, S., Sokhan, D., Sober, D., Sparveris, N., Strauch, S., Taiuti, M., Tan, J. A., Ungaro, M., Voskanyan, H., Voutier, E., Watts, D. P., Weinstein, L., Wei, X., Weygand, D. P., Zachariou, N., Zhang, J., Zhao, Z. W.
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Abstract/Description: Exclusive photoproduction cross sections have been measured for the process gamma p -> p pi degrees[e(+) e(-)(gamma)] with the Dalitz decay final state using tagged photon energies in the range of E-gamma = 1.275-5.425 GeV. The complete angular distribution of the final state pi degrees, for the entire photon energy range up to large values of t and u, has been measured for the first time. The data obtained show that the cross section d sigma / dt, at mid to large angles, decreases with...
Show moreExclusive photoproduction cross sections have been measured for the process gamma p -> p pi degrees[e(+) e(-)(gamma)] with the Dalitz decay final state using tagged photon energies in the range of E-gamma = 1.275-5.425 GeV. The complete angular distribution of the final state pi degrees, for the entire photon energy range up to large values of t and u, has been measured for the first time. The data obtained show that the cross section d sigma / dt, at mid to large angles, decreases with energy as s(-6.89 +/- 0.26). This is in agreement with the perturbative QCD quark counting rule prediction of s(-7). Paradoxically, the size of angular distribution of measured cross sections is greatly underestimated by the QCD-based generalized parton distribution mechanism at highest available invariant energy s = 11 GeV2. At the same time, the Regge-exchange-based models for pi degrees photoproduction are more consistent with experimental data.
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Date Issued: 2018-07-25
Identifier: FSU_libsubv1_wos_000439733000007, 10.1103/PhysRevC.98.015207
Format: Citation

Title: Measurement Of The Beam Asymmetry Sigma And The Target Asymmetry T In The Photoproduction Of Omega Mesons Off The Proton Using Clas At Jefferson Laboratory.
Creator: Roy, P., Akbar, Z., Park, S., Crede, V., Anisovich, A. V., Denisenko, I., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Adhikari, K. P., Adhikari, S., Pereira, S. Anefalos, Ball...
Show moreRoy, P., Akbar, Z., Park, S., Crede, V., Anisovich, A. V., Denisenko, I., Klempt, E., Nikonov, V. A., Sarantsev, A. V., Adhikari, K. P., Adhikari, S., Pereira, S. Anefalos, Ball, J., Balossino, I., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brock, J., Brooks, W. K., Burkert, V. D., Carlin, C., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clary, B. A., Cole, P. L., Contalbrigo, M., D'Angelo, A., Dashyan, N., De Vita, R., Deur, A., Djalali, C., Dugger, M., Dupre, R., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Filippi, A., Fradi, A., Gavalian, G., Gevorgyan, N., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Hattawy, M., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Joo, K., Joosten, S., Keith, C. D., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mayer, M., McCracken, M. E., McKinnon, B., Meekins, D. G., Meyer, C. A., Meziani, Z. E., Mineeva, T., Mokeev, V., Montgomery, R. A., Movsisyan, A., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, E., Phelps, W., Pierce, J. J., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Ritchie, B. G., Rizzo, A., Rosner, G., Sabatie, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu, Smith, G. D., Sober, D. I., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Torayev, B., Ungaro, M., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W.
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Abstract/Description: The photoproduction of omega mesons off the proton has been studied in the reaction gamma p -> p omega using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the decay omega -> pi(+)pi(-)pi(0), using a transversely polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant...
Show moreThe photoproduction of omega mesons off the proton has been studied in the reaction gamma p -> p omega using the CEBAF Large Acceptance Spectrometer (CLAS) and the frozen-spin target in Hall B at the Thomas Jefferson National Accelerator Facility. For the first time, the target asymmetry T has been measured in photoproduction from the decay omega -> pi(+)pi(-)pi(0), using a transversely polarized target with energies ranging from just above the reaction threshold up to 2.8 GeV. Significant nonzero values are observed for these asymmetries, reaching about 30-40% in the third-resonance region. New measurements for the photon-beam asymmetry Sigma are also presented, which agree well with previous CLAS results and extend the world database up to 2.1 GeV. These data and additional. photoproduction observables from CLAS were included in a partial-wave analysis within the Bonn-Gatchina framework. Significant contributions from s-channel resonance production were found in addition to t-channel exchange processes.
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Date Issued: 2018-05-04
Identifier: FSU_libsubv1_wos_000431995400002, 10.1103/PhysRevC.97.055202
Format: Citation

Title: Interaction Of He-8 With Pb-208 At Near-barrier Energies: He-4 And He-6 Production.
Creator: Marquinez-Duran, G., Martel, I., Sanchez-Benitez, A. M., Acosta, L., Aguado, J. L., Berjillos, R., Pinto, A. R., Garcia, T., Duenas, J. A., Rusek, K., Keeley, N., Kemper, K. W.,...
Show moreMarquinez-Duran, G., Martel, I., Sanchez-Benitez, A. M., Acosta, L., Aguado, J. L., Berjillos, R., Pinto, A. R., Garcia, T., Duenas, J. A., Rusek, K., Keeley, N., Kemper, K. W., Alvarez, M. A. G., Borge, M. J. G., Chbihi, A., Cruz, C., Cubero, M., Fernandez-Garcia, J. P., Fernandez-Martinez, B., Flores, J. L., Gomez-Camacho, J., Labrador, J. A., Marques, F. M., Moro, A. M., Mazzocco, M., Pakou, A., Parkar, V. V., Patronis, T. N., Pesudo, V., Pierroutsakou, D., Raabe, R., Silvestri, R., Soic, N., Standylo, L., Strojek, I., Tengblad, O., Wolski, R., Abou-Haidar, Z.
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Abstract/Description: Angular distributions for the inclusive He-4 and He-6 production cross sections in the He-8 + Pb-208 system at incident energies of 16 and 22 MeV measured at the SPIRAL facility of the GANIL laboratory are presented. Using a combination of kinematical arguments and distorted wave Born approximation (DWBA) calculations, neutron transfer reactions were inferred to be the dominant contributors to both inclusive cross sections. Model-dependent values for the ratios of two- to one-neutron...
Show moreAngular distributions for the inclusive He-4 and He-6 production cross sections in the He-8 + Pb-208 system at incident energies of 16 and 22 MeV measured at the SPIRAL facility of the GANIL laboratory are presented. Using a combination of kinematical arguments and distorted wave Born approximation (DWBA) calculations, neutron transfer reactions were inferred to be the dominant contributors to both inclusive cross sections. Model-dependent values for the ratios of two- to one-neutron stripping, sigma(2n)/sigma(1n), were derived and compared with previous results for He-8 and He-6 projectiles incident on other heavy targets. Three- and four-neutron stripping were inferred to be the main processes leading to He-4 production, although the exact mechanism remains to be elucidated.
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Date Issued: 2018-09-28
Identifier: FSU_libsubv1_wos_000446281600004, 10.1103/PhysRevC.98.034615
Format: Citation

Title: Alpha-unbound Levels In Ar-34 From Ar-36(p,t)ar-34 Reaction Measurements And Implications For The Astrophysical S-30(alpha, P)cl-33 Reaction Rate.
Creator: Long, A. M., Adachi, T., Beard, M., Berg, G. P. A., Couder, M., deBoer, R. J., Dozono, M., Gorres, J., Fujita, H., Fujita, Y., Hatanaka, K., Ishikawa, D., Kubo, T., Matsubara, H...
Show moreLong, A. M., Adachi, T., Beard, M., Berg, G. P. A., Couder, M., deBoer, R. J., Dozono, M., Gorres, J., Fujita, H., Fujita, Y., Hatanaka, K., Ishikawa, D., Kubo, T., Matsubara, H., Namiki, Y., O'Brien, S., Ohkuma, Y., Okamura, H., Ong, H. J., Patel, D., Sakemi, Y., Shimbara, Y., Suzuki, S., Talwar, R., Tamii, A., Volya, A., Wakasa, T., Watanabe, R., Wiescher, M., Yamada, R., Zenihiro, J.
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Abstract/Description: The S-30(alpha,p)Cl-33 reaction has been identified in several type-1 x-ray burst (XRB) sensitivity studies as a significant reaction within the alpha p process, possibly influencing not only the abundances of burst ashes but also the bolometric shape of double-peaked light curves coming from certain XRB systems. Given the dearth of experimental data on the(30)S(alpha,p)Cl-33 reaction at burst temperatures, we have performed high energy-resolution forward-angle Ar-36(p,t)Ar-34 measurements in...
Show moreThe S-30(alpha,p)Cl-33 reaction has been identified in several type-1 x-ray burst (XRB) sensitivity studies as a significant reaction within the alpha p process, possibly influencing not only the abundances of burst ashes but also the bolometric shape of double-peaked light curves coming from certain XRB systems. Given the dearth of experimental data on the(30)S(alpha,p)Cl-33 reaction at burst temperatures, we have performed high energy-resolution forward-angle Ar-36(p,t)Ar-34 measurements in order to identify levels in( 34)Ar that could appear as resonances in the S-30(alpha,p)Cl-33 reaction. Energies of levels identified in this work, along with model-based assumptions for spin assignments and spectroscopic factors, were then used to determine a rate for the S-30(alpha,p)Cl-33 reaction based on a narrow-resonance formalism. The rates determined in this work are then compared with two standard Hauser-Feshbach model predictions over a range of XRB temperatures.
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Date Issued: 2018-05-22
Identifier: FSU_libsubv1_wos_000433031700004, 10.1103/PhysRevC.97.054613
Format: Citation

Title: Cluster Folding Analysis Of Ne-20+o-16 Elastic Transfer.
Creator: Hamada, Sh, Keeley, N., Kemper, K. W., Rusek, K.
Abstract/Description: The available experimental data for the Ne-20 + O-16 system in the energy range where the effect of a-cluster transfer is well observed are reanalyzed using the cluster folding model. The cluster folding potential, which includes both real and imaginary terms, reproduces the data at forward angles and the inclusion of the O-16(Ne-20,O-16)Ne-20 elastic transfer process provides a satisfactory description of the backward angles. The spectroscopic factor for the Ne-20 -> O-16 + alpha overlap was...
Show moreThe available experimental data for the Ne-20 + O-16 system in the energy range where the effect of a-cluster transfer is well observed are reanalyzed using the cluster folding model. The cluster folding potential, which includes both real and imaginary terms, reproduces the data at forward angles and the inclusion of the O-16(Ne-20,O-16)Ne-20 elastic transfer process provides a satisfactory description of the backward angles. The spectroscopic factor for the Ne-20 -> O-16 + alpha overlap was extracted and compared with other values from the literature. The present results suggest that the (Ne-20, O-16) reaction might be an alternative means of exploring the alpha-particle structure of nuclei.
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Date Issued: 2018-05-21
Identifier: FSU_libsubv1_wos_000433031200003, 10.1103/PhysRevC.97.054609
Format: Citation

Title: Measurements Of The Gamma(upsilon)p -> P 'pi(+)pi(- )cross Section With The Clas Detector For 0.4 Gev2 < Q(2) < 1.0 Gev2 And 1.3 Gev < W < 1.825 Gev.
Creator: Fedotov, G., Skorodumina, Iu A., Burkert, V. D., Gothe, R. W., Hicks, K., Mokeev, V., Adhikari, S., Armstrong, Whitney R., Avakian, H., Ball, J., Balossino, I., Barion, L.,...
Show moreFedotov, G., Skorodumina, Iu A., Burkert, V. D., Gothe, R. W., Hicks, K., Mokeev, V., Adhikari, S., Armstrong, Whitney R., Avakian, H., Ball, J., Balossino, I., Barion, L., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clary, Brandon A., Cole, P. L., Contalbrigo, M., Cortes, O., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Dear, A., Djalali, C., Dupre, R., Egiyan, H., El Fassi, L., Eugenio, P., Fersch, R., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Golovatch, E., Griffioen, K. A., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Holtrop, M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jo, H. S., Johnston, S., Joosten, S., Kabir, M. L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuleshov, S., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Markov, N., McKinnon, B., Mineeva, T., Montgomery, R. A., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Pogorelko, O., Price, J. W., Procureur, S., Prok, Y., Protopopescu, D., Ripani, M., Riser, D., Ritchie, B. G., Rizzo, A., Sabatie, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Smith, G. D., Sober, D., Sokhan, D., Sparveris, N., Strakovsky, I. I., Strauch, S., Taiuti, M., Tan, J. A., Tyler, N., Ungaro, M., Voskanyan, H., Voutier, E., Wei, X., Wood, M. H., Zachariou, N., Zhang, J., Zhao, Z. W.
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Abstract/Description: New results on the single-differential and fully integrated cross sections for the process gamma(upsilon)p -> p'pi(+)pi(-) are presented. The experimental data were collected with the CLAS detector at Jefferson Laboratory. Measurements were carried out in the kinematic region of the reaction invariant mass W from 1.3 to 1.825 GeV and the photon virtuality Q(2) from 0.4 to 1.0 GeV2. The cross sections were obtained in narrow Q(2) bins (0.05 GeV2) with the smallest statistical uncertainties...
Show moreNew results on the single-differential and fully integrated cross sections for the process gamma(upsilon)p -> p'pi(+)pi(-) are presented. The experimental data were collected with the CLAS detector at Jefferson Laboratory. Measurements were carried out in the kinematic region of the reaction invariant mass W from 1.3 to 1.825 GeV and the photon virtuality Q(2) from 0.4 to 1.0 GeV2. The cross sections were obtained in narrow Q(2) bins (0.05 GeV2) with the smallest statistical uncertainties achieved in double-pion electroproduction experiments to date. The results were found to be in agreement with previously available data where they overlap. A preliminary interpretation of the extracted cross sections, which was based on a phenomenological meson-baryon reaction model, revealed substantial relative contributions from nucleon resonances. The data offer promising prospects to improve knowledge on the Q(2) evolution of the electrocouplings of most resonances with masses up to similar to 1.8 GeV.
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Date Issued: 2018-08-21
Identifier: FSU_libsubv1_wos_000442344300006, 10.1103/PhysRevC.98.025203
Format: Citation

Title: Gamma-ray Decay From Neutron-bound And Unbound States In Mo-95 And A Novel Technique For Spin Determination.
Creator: Wiedeking, M., Krticka, M., Bernstein, L. A., Allmond, J. M., Basunia, M. S., Bleuel, D. L., Burke, J. T., Daub, B. H., Fallon, P., Firestone, R. B., Goldblum, B. L., Hatarik, R...
Show moreWiedeking, M., Krticka, M., Bernstein, L. A., Allmond, J. M., Basunia, M. S., Bleuel, D. L., Burke, J. T., Daub, B. H., Fallon, P., Firestone, R. B., Goldblum, B. L., Hatarik, R., Lake, P. T., Larsen, A. C., Lee, I.-Y., Lesher, S. R., Paschalis, S., Petri, M., Phair, L., Scielzo, N. D., Volya, A.
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Abstract/Description: The emission of gamma rays from neutron-bound and neutron-unbound states in Mo-95, populated in the Mo-94(d, p) reaction, has been investigated. Charged particles and gamma radiation were detected with arrays of annular silicon and Clover-type high-purity Germanium detectors, respectively. Utilizing p-gamma and p-gamma-gamma coincidences, the Mo-95 level scheme was greatly enhanced with 102 new transitions and 43 new states. It agrees well with shell model calculations for excitation energies...
Show moreThe emission of gamma rays from neutron-bound and neutron-unbound states in Mo-95, populated in the Mo-94(d, p) reaction, has been investigated. Charged particles and gamma radiation were detected with arrays of annular silicon and Clover-type high-purity Germanium detectors, respectively. Utilizing p-gamma and p-gamma-gamma coincidences, the Mo-95 level scheme was greatly enhanced with 102 new transitions and 43 new states. It agrees well with shell model calculations for excitation energies below approximate to 2 MeV. From p-gamma coincidence data, a new method for the determination of spins of discrete levels is proposed. The method exploits the suppression of high-angular momentum neutron emission from levels with high spins populated in the (d, p) reaction above the neutron separation energy. Spins for almost all Mo-95 levels below 2 MeV (and for a few levels above) have been determined with this method.
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Date Issued: 2016-02-01
Identifier: FSU_libsubv1_wos_000369407300003, 10.1103/PhysRevC.93.024303
Format: Citation

Title: Exclusive Eta Electroproduction At W > 2 Gev With Clas And Transversity Generalized Parton Distributions.
Creator: Bedlinskiy, I., Kubarovsky, V., Stoler, P., Adhikari, K. P., Akbar, Z., Pereira, S. Anefalos, Avakian, H., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Biselli, A....
Show moreBedlinskiy, I., Kubarovsky, V., Stoler, P., Adhikari, K. P., Akbar, Z., Pereira, S. Anefalos, Avakian, H., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Burkert, V. D., Cao, T., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dupre, R., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Fersch, R., Filippi, A., Fleming, J. A., Forest, T. A., Garcon, M., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gleason, C., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Hughes, S. M., Hyde, C. E., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jiang, H., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Kuhn, S. E., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Markov, N., McKinnon, B., Meziani, Z. E., Mirazita, M., Mokeev, V., Montgomery, A., Movsisyan, A., Camacho, C. Munoz, Nadel-Turonski, P., Net, L. A., Ni, A., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Peng, P., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatie, F., Saini, M. S., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu, Smith, G. D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Turisini, M., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Yurov, M., Zachariou, N., Zhang, J., Zonta, I.
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Abstract/Description: The cross section of the exclusive eta electroproduction reaction ep -> e'p'eta was measured at Jefferson Laboratorywith a 5.75 GeV electron beam and the CLAS detector. Differential cross sections d(4) sigma/dtdQ(2) dx(B)d phi(eta) and structure functions sigma(U) = sigma(T) + epsilon sigma(L), sigma(TT), and sigma(LT), as functions of t, were obtained over a wide range of Q(2) and x(B). The eta structure functions are compared with those previously measured for pi(0) at the same kinematics....
Show moreThe cross section of the exclusive eta electroproduction reaction ep -> e'p'eta was measured at Jefferson Laboratorywith a 5.75 GeV electron beam and the CLAS detector. Differential cross sections d(4) sigma/dtdQ(2) dx(B)d phi(eta) and structure functions sigma(U) = sigma(T) + epsilon sigma(L), sigma(TT), and sigma(LT), as functions of t, were obtained over a wide range of Q(2) and x(B). The eta structure functions are compared with those previously measured for pi(0) at the same kinematics. At low t, both pi(0) and eta are described reasonably well by generalized parton distributions (GPDs) in which chiral-odd transversity GPDs are dominant. The pi(0) and eta data, when taken together, can facilitate the flavor decomposition of the transversity GPDs.
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Date Issued: 2017-03-10
Identifier: FSU_libsubv1_wos_000396022500005, 10.1103/PhysRevC.95.035202
Format: Citation

Title: Measurement Of Target And Double-spin Asymmetries For The (e)over-right-arrow (p)over-right-arrow -> E Pi(+)(n) Reaction In The Nucleon Resonance Region At Low Q(2).
Creator: Zheng, X., Adhikari, K. P., Bosted, P., Deur, A., Drozdov, V., El Fassi, L., Kang, Hyekoo, Kovacs, K., Kuhn, S., Long, E., Phillips, S. K., Ripani, M., Slifer, K., Smith, L. C.,...
Show moreZheng, X., Adhikari, K. P., Bosted, P., Deur, A., Drozdov, V., El Fassi, L., Kang, Hyekoo, Kovacs, K., Kuhn, S., Long, E., Phillips, S. K., Ripani, M., Slifer, K., Smith, L. C., Adikaram, D., Akbar, Z., Amaryan, M. J., Pereira, S. Anefalos, Asryan, G., Avakian, H., Badui, R. A., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Bueltmann, S., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Chen, J.-P., Chetry, T., Choi, Seonho, Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Djalali, C., Dodge, G. E., Dupre, R., Egiyan, H., El Alaoui, A., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Fersch, R., Filippi, A., Fleming, J. A., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gleason, C., Golovach, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Guo, L., Hanretty, C., Harrison, N., Hattawy, M., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jiang, H., Jo, H. S., Joosten, S., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Kubarovsky, V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Markov, N., McKinnon, B., Mirazita, M., Mokeev, V., Movsisyan, A., Munevar, E., Camacho, C. Munoz, Murdoch, G., Nadel-Turonski, P., Net, L. A., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Peng, P., Pisano, S., Pogorelko, O., Price, J. W., Puckett, A. J. R., Raue, B. A., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatie, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Skorodumina, Iu, Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zhang, J., Zonta, I.
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Abstract/Description: We report measurements of target- and double-spin asymmetries for the exclusive channel (e) over right arrow (p) over right arrow -> ep(+)(n) in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). These asymmetries were extracted from data obtained using a longitudinally polarized NH3 target and a longitudinally polarized electron beam with energies 1.1, 1.3, 2.0, 2.3, and 3.0 GeV. The new results are consistent with previous CLAS publications...
Show moreWe report measurements of target- and double-spin asymmetries for the exclusive channel (e) over right arrow (p) over right arrow -> ep(+)(n) in the nucleon resonance region at Jefferson Lab using the CEBAF Large Acceptance Spectrometer (CLAS). These asymmetries were extracted from data obtained using a longitudinally polarized NH3 target and a longitudinally polarized electron beam with energies 1.1, 1.3, 2.0, 2.3, and 3.0 GeV. The new results are consistent with previous CLAS publications but are extended to a low Q(2) range from 0.0065 to 0.35 (GeV/c)(2). The Q(2) access was made possible by a custom-built Cherenkov detector that allowed the detection of electrons for scattering angles as low as 6 degrees. These results are compared with the unitary isobar models JANR and MAID, the partial-wave analysis prediction from SAID, and the dynamic model DMT. In many kinematic regions our results, in particular results on the target asymmetry, help to constrain the polarization-dependent components of these models.
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Date Issued: 2016-10-19
Identifier: FSU_libsubv1_wos_000386170700004, 10.1103/PhysRevC.94.045206
Format: Citation

Title: Measurement Of The Beam Asymmetry Sigma For Pi(0) And Eta Photoproduction On The Proton At E-gamma=9 Gev.
Creator: Al Ghoul, H., Anassontzis, E. G., Austregesilo, A., Barbosa, F., Barnes, A., Beattie, T. D., Bennett, D. W., Berdnikov, V. V., Black, T., Boeglin, W., Briscoe, W. J., Brooks, W....
Show moreAl Ghoul, H., Anassontzis, E. G., Austregesilo, A., Barbosa, F., Barnes, A., Beattie, T. D., Bennett, D. W., Berdnikov, V. V., Black, T., Boeglin, W., Briscoe, W. J., Brooks, W. K., Cannon, B. E., Chernyshov, O., Chudakov, E., Crede, V., Dalton, M. M., Deur, A., Dobbs, S., Dolgolenko, A., Dugger, M., Dzhygadlo, R., Egiyan, H., Eugenio, P., Fanelli, C., Foda, A. M., Frye, J., Furletov, S., Gan, L., Gasparian, A., Gerasimov, A., Gevorgyan, N., Goetzen, K., Goryachev, V. S., Guo, L., Hakobyan, H., Hardin, J., Henderson, A., Huber, G. M., Ireland, D. G., Ito, M. M., Jarvis, N. S., Jones, R. T., Kakoyan, V., Kamel, M., Klein, F. J., Kliemt, R., Kourkoumeli, C., Kuleshov, S., Kuznetsov, I., Lara, M., Larin, I., Lawrence, D., Levine, W. I., Livingston, K., Lolos, G. J., Lyubovitskij, V., Mack, D., Mattione, P. T., Matveev, V., McCaughan, M., McCracken, M., McGinley, W., McIntyre, J., Mendez, R., Meyer, C. A., Miskimen, R., Mitchell, R. E., Mokaya, F., Moriya, K., Nerling, F., Nigmatkulov, G., Ochoa, N., Ostrovidov, A. I., Papandreou, Z., Patsyuk, M., Pedroni, R., Pennington, M. R., Pentchev, L., Peters, K. J., Pooser, E., Pratt, B., Qiang, Y., Reinhold, J., Ritchie, B. G., Robison, L., Romanov, D., Salgado, C., Schumacher, R. A., Schwarz, C., Schwiening, J., Semenov, A. Yu, Semenova, I. A., Seth, K. K., Shepherd, M. R., Smith, E. S., Sober, D. I., Somov, A., Somov, S., Soto, O., Sparks, N., Staib, M. J., Stevens, J. R., Strakovsky, I. I., Subedi, A., Tarasov, V., Taylor, S., Teymurazyan, A., Tolstukhin, I., Tomaradze, A., Toro, A., Tsaris, A., Vasileiadis, G., Vega, I., Walford, N. K., Werthmuller, D., Whitlatch, T., Williams, M., Wolin, E., Xiao, T., Zarling, J., Zhang, Z., Zihlmann, B., Mathieu, V., Nys, J.
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Abstract/Description: We report measurements of the photon beam asymmetry Sigma for the reactions (gamma) over right arrowp -> p pi(0) and gamma p -> p eta from the GLUEX experiment using a 9 GeV linearly polarized, tagged photon beam incident on a liquid hydrogen target in Jefferson Lab's Hall D. The asymmetries, measured as a function of the proton momentum transfer, possess greater precision than previous pi(0) measurements and are the first. measurements in this energy regime. The results are compared with...
Show moreWe report measurements of the photon beam asymmetry Sigma for the reactions (gamma) over right arrowp -> p pi(0) and gamma p -> p eta from the GLUEX experiment using a 9 GeV linearly polarized, tagged photon beam incident on a liquid hydrogen target in Jefferson Lab's Hall D. The asymmetries, measured as a function of the proton momentum transfer, possess greater precision than previous pi(0) measurements and are the first. measurements in this energy regime. The results are compared with theoretical predictions based on t-channel, quasiparticle exchange and constrain the axial-vector component of the neutral meson production mechanism in these models.
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Date Issued: 2017-04-24
Identifier: FSU_libsubv1_wos_000400140500002, 10.1103/PhysRevC.95.042201
Format: Citation

Title: Indirect Study Of The Stellar Ar-34(alpha, P)k-37 Reaction Rate Through Ca-40(p, T)ca-38 Reaction Measurements.
Creator: Long, A. M., Adachi, T., Beard, M., Berg, G. P. A., Buthelezi, Z., Carter, J., Couder, M., deBoer, R. J., Fearick, R. W., Fortsch, S. V., Gorres, J., Mira, J. P., Murray, S. H....
Show moreLong, A. M., Adachi, T., Beard, M., Berg, G. P. A., Buthelezi, Z., Carter, J., Couder, M., deBoer, R. J., Fearick, R. W., Fortsch, S. V., Gorres, J., Mira, J. P., Murray, S. H. T., Neveling, R., Papka, P., Smit, F. D., Sideras-Haddad, E., Swartz, J. A., Talwar, R., Usman, I. T., Wiescher, M., Van Zyl, J. J., Volya, A.
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Abstract/Description: The Ar-34(alpha, p)K-37 reaction is believed to be one of the last in a sequence of (alpha, p) and (p, gamma) reactions within the T-z = -1, sd-shell nuclei, known as the alpha p-process. This process is expected to influence the shape and rise times of luminosity curves coming from type I x-ray bursts (XRBs). With very little experimental information known on many of the reactions within the alpha p-process, stellar rates are calculated using a statistical model, such as Hauser-Feshbach....
Show moreThe Ar-34(alpha, p)K-37 reaction is believed to be one of the last in a sequence of (alpha, p) and (p, gamma) reactions within the T-z = -1, sd-shell nuclei, known as the alpha p-process. This process is expected to influence the shape and rise times of luminosity curves coming from type I x-ray bursts (XRBs). With very little experimental information known on many of the reactions within the alpha p-process, stellar rates are calculated using a statistical model, such as Hauser-Feshbach. Questions on the applicability of a Hauser-Feshbach model for the Ar-34(alpha, p)K-37 reaction arise due to level density considerations in the compound nucleus, Ca-38. We have performed high energy-resolution forward-angle Ca-40(p, t)Ca-38 measurements with the K = 600 spectrograph at iThemba LABS in order to identify levels above the alpha-threshold in Ca-38. States identified in this work were then used to determine the Ar-34(alpha, p)K-37 reaction rate based on a narrow-resonance formalism. Comparisons are made to two standard Hauser-Feshbach model predicted rates at XRB temperatures.
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Date Issued: 2017-05-10
Identifier: FSU_libsubv1_wos_000401231400006, 10.1103/PhysRevC.95.055803
Format: Citation

Title: Independent Measurement Of The Hoyle State Beta Feeding From B-12 Using Gammasphere.
Creator: Munch, M., Alcorta, M., Fynbo, H. O. U., Albers, M., Almaraz-Calderon, S., Avila, M. L., Ayangeakaa, A. D., Back, B. B., Bertone, P. F., Carnelli, P. F. F., Carpenter, M. P.,...
Show moreMunch, M., Alcorta, M., Fynbo, H. O. U., Albers, M., Almaraz-Calderon, S., Avila, M. L., Ayangeakaa, A. D., Back, B. B., Bertone, P. F., Carnelli, P. F. F., Carpenter, M. P., Chiara, C. J., Clark, J. A., DiGiovine, B., Greene, J. P., Harker, J. L., Hoffman, C. R., Hubbard, N. J., Jiang, C. L., Kirsebom, O. S., Lauritsen, T., Laursen, K. L., Marley, S. T., Nair, C., Nusair, O., Santiago-Gonzalez, D., Sethi, J., Seweryniak, D., Talwar, R., Ugalde, C., Zhu, S.
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Abstract/Description: Using an array of high-purity Compton-suppressed germanium detectors, we performed an independent measurement of the beta-decay branching ratio from B-12 to the second-excited state, also known as the Hoyle state, in C-12. Our result is 0.64(11)%, which is a factor similar to 2 smaller than the previously established literature value, but is in agreement with another recent measurement. This could indicate that the Hoyle state is more clustered than previously believed. The angular...
Show moreUsing an array of high-purity Compton-suppressed germanium detectors, we performed an independent measurement of the beta-decay branching ratio from B-12 to the second-excited state, also known as the Hoyle state, in C-12. Our result is 0.64(11)%, which is a factor similar to 2 smaller than the previously established literature value, but is in agreement with another recent measurement. This could indicate that the Hoyle state is more clustered than previously believed. The angular correlation of the Hoyle state. cascade has also been measured for the first time. It is consistent with theoretical predictions.
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Date Issued: 2016-06-07
Identifier: FSU_libsubv1_wos_000377302500006, 10.1103/PhysRevC.93.065803
Format: Citation

Title: Half-lives Of Neutron-rich Cd128-130.
Creator: Dunlop, R., Bildstein, V., Dillmann, I., Jungclaus, A., Svensson, C. E., Andreoiu, C., Ball, G. C., Bernier, N., Bidaman, H., Boubel, P., Burbadge, C., Caballero-Folch, R.,...
Show moreDunlop, R., Bildstein, V., Dillmann, I., Jungclaus, A., Svensson, C. E., Andreoiu, C., Ball, G. C., Bernier, N., Bidaman, H., Boubel, P., Burbadge, C., Caballero-Folch, R., Dunlop, M. R., Evitts, L. J., Garcia, F., Garnsworthy, A. B., Garrett, P. E., Hackman, G., Hallam, S., Henderson, J., Ilyushkin, S., Kisliuk, D., Krucken, R., Lassen, J., Li, R., MacConnachie, E., MacLean, A. D., McGee, E., Moukaddam, M., Olaizola, B., Padilla-Rodal, E., Park, J., Paetkau, O., Petrache, C. M., Pore, J. L., Radich, A. J., Ruotsalainen, P., Smallcombe, J., Smith, J. K., Tabor, S. L., Teigelhofer, A., Turko, J., Zidar, T.
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Abstract/Description: The beta-decay half-lives of Cd128-130 have been measured with the newly commissioned GRIFFIN gamma-ray spectrometer at the TRIUMF-ISAC facility. The time structures of the most intense gamma rays emitted following the beta decay were used to determine the half-lives of Cd-128 and Cd-130 to be T-1/2 = 246.2 (21) ms and T-1/2 = 126 (4) ms, respectively. The half-lives of the 3/2(+) and 11/2(-) states of Cd-129 were measured to be T-1/2(3/2(+)) = 157 (8) ms and T-1/2(11/2(-)) = 147(3) ms. The...
Show moreThe beta-decay half-lives of Cd128-130 have been measured with the newly commissioned GRIFFIN gamma-ray spectrometer at the TRIUMF-ISAC facility. The time structures of the most intense gamma rays emitted following the beta decay were used to determine the half-lives of Cd-128 and Cd-130 to be T-1/2 = 246.2 (21) ms and T-1/2 = 126 (4) ms, respectively. The half-lives of the 3/2(+) and 11/2(-) states of Cd-129 were measured to be T-1/2(3/2(+)) = 157 (8) ms and T-1/2(11/2(-)) = 147(3) ms. The half-lives of the Cd isotopes around the N = 82 shell closure are an important ingredient in astrophysical simulations to derive the magnitude of the second r-process abundance peak in the A similar to 130 region. Our new results are compared with recent literature values and theoretical calculations.
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Date Issued: 2016-06-16
Identifier: FSU_libsubv1_wos_000378051800001, 10.1103/PhysRevC.93.062801
Format: Citation

Title: Multiple Band Structures In Ge-70.
Creator: Haring-Kaye, R. A., Morrow, S. I., Doring, J., Tabor, S. L., Le, K. Q., Allegro, P. R. P., Bender, P. C., Elder, R. M., Medina, N. H., Oliveira, J. R. B., Tripathi, Vandana
Abstract/Description: High-spin states in Ge-70 were studied using the Mn-55(O-18, p2n) fusion-evaporation reaction at a beam energy of 50 MeV. Prompt gamma-gamma coincidences were measured using the Florida State University Compton-suppressed Ge array consisting of three Clover detectors and seven single-crystal detectors. An investigation of these coincidences resulted in the addition of 31 new transitions and the rearrangement of four others in the Ge-70 level scheme, providing a more complete picture of the...
Show moreHigh-spin states in Ge-70 were studied using the Mn-55(O-18, p2n) fusion-evaporation reaction at a beam energy of 50 MeV. Prompt gamma-gamma coincidences were measured using the Florida State University Compton-suppressed Ge array consisting of three Clover detectors and seven single-crystal detectors. An investigation of these coincidences resulted in the addition of 31 new transitions and the rearrangement of four others in the Ge-70 level scheme, providing a more complete picture of the high-spin decay pattern involving both positive-and negative-parity states with multiple band structures. Spins were assigned based on directional correlation of oriented nuclei ratios, which many times also led to unambiguous parity determinations based on the firm assignments for low-lying states made in previous work. Total Routhian surface calculations, along with the observed trends in the experimental kinematic moment of inertia with rotational frequency, support the multiquasiparticle configurations of the various crossing bands proposed in recent studies. The high-spin excitation spectra predicted by previous shell-model calculations compare favorably with the experimental one determined from this study.
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Date Issued: 2018-02-07
Identifier: FSU_libsubv1_wos_000424379000002, 10.1103/PhysRevC.97.024308
Format: Citation

Title: Cluster Structure Of O-17.
Creator: Mezhevych, S. Yu, Rudchik, A. T., Rudchik, A. A., Ponkratenko, O. A., Keeley, N., Kemper, K. W., Mazzocco, M., Rusek, K., Sakuta, S. B.
Abstract/Description: The transfer reaction C-13(B-11, Li-7)O-17 leading to the ground and several excited states of O-17 was investigated at an incident boron beam energy of 45 MeV. The experimental data were analyzed by means of coupled-channel Born approximation calculations and O-17 = alpha + C-13 spectroscopic factors were extracted from a comparison of the data and the calculations at forward angles. The largest spectroscopic factor obtained was that for the subthreshold 6.356 MeV 1/2(+) state, important for...
Show moreThe transfer reaction C-13(B-11, Li-7)O-17 leading to the ground and several excited states of O-17 was investigated at an incident boron beam energy of 45 MeV. The experimental data were analyzed by means of coupled-channel Born approximation calculations and O-17 = alpha + C-13 spectroscopic factors were extracted from a comparison of the data and the calculations at forward angles. The largest spectroscopic factor obtained was that for the subthreshold 6.356 MeV 1/2(+) state, important for the production of neutrons in the stellar environment, and the squared Coulomb modified asymptotic normalization coefficient, (C) over tilde2, is consistent with previous determinations. A significant rise in the experimental data at backward scattering angles suggested the possibility of 17O = Li-6+B-11 clustering in some O-17 states, including the ground state. However, explicit inclusion of Li-6 transfer in the calculations could not explain the observed effect. Compound nucleus calculations suggested that while the backward angle rise could be explained by such processes for two of the populated O-17 states other multistep direct processes must contribute significantly to the other two.
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Date Issued: 2017-03-16
Identifier: FSU_libsubv1_wos_000396701600002, 10.1103/PhysRevC.95.034607
Format: Citation

Title: Octupole Strength In The Neutron-rich Calcium Isotopes.
Creator: Riley, L. A., McPherson, D. M., Agiorgousis, M. L., Baugher, T. R., Bazin, D., Bowry, M., Cottle, P. D., DeVone, F. G., Gade, A., Glowacki, M. T., Gregory, S. D., Haldeman, E. B...
Show moreRiley, L. A., McPherson, D. M., Agiorgousis, M. L., Baugher, T. R., Bazin, D., Bowry, M., Cottle, P. D., DeVone, F. G., Gade, A., Glowacki, M. T., Gregory, S. D., Haldeman, E. B., Kemper, K. W., Lunderberg, E., Noji, S., Recchia, F., Sadler, B. V., Scott, M., Weisshaar, D., Zegers, R. G. T.
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Abstract/Description: Low-lying excited states of the neutron-rich calcium isotopes Ca48-52 have been studied via gamma-ray spectroscopy following inverse-kinematics proton scattering on a liquid hydrogen target using the GRETINA gamma-ray tracking array. The energies and strengths of the octupole states in these isotopes are remarkably constant, indicating that these states are dominated by proton excitations.
Date Issued: 2016-04-22
Identifier: FSU_libsubv1_wos_000374546500004, 10.1103/PhysRevC.93.044327
Format: Citation

Title: Photoproduction Of The F(1)(1285) Meson.
Creator: Dickson, R., Schumacher, R. A., Adhikari, K. P., Akbar, Z., Amaryan, M. J., Pereira, S. Anefalos, Badui, R. A., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli...
Show moreDickson, R., Schumacher, R. A., Adhikari, K. P., Akbar, Z., Amaryan, M. J., Pereira, S. Anefalos, Badui, R. A., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A., Boiarinov, S., Briscoe, W. J., Burkert, V. D., Cao, T., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Chetry, T., Ciullo, G., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dugger, M., Dupre, R., El Alaoui, A., El Fassi, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J. A., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gothe, R. W., Griffioen, K. A., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Holtrop, M., Hicks, K., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, H., Jo, H. S., Joosten, S., Keller, D., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Mattione, P., McKinnon, B., Meyer, C. A., Mirazita, M., Markov, N., Mokeev, V., Moriya, K., Munevar, E., Murdoch, G., Nadel-Turonski, P., Net, L. A., Ni, A., Osipenko, M., Ostrovidov, A. I., Park, K., Pasyuk, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Puckett, A. J. R., Raue, B. A., Ripani, M., Rizzo, A., Rosner, G., Roy, P., Salgado, C., Seder, E., Sharabian, Y. G., Skorodumina, Iu, Smith, E. S., Smith, G. D., Sober, D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Stankovic, I., Strauch, S., Sytnik, V., Taiuti, M., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Weygand, D., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., Zonta, I.
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Abstract/Description: The f(1)(1285) meson withmass 1281.0 +/- 0.8MeV/c(2) and width 18.4 +/- 1.4MeV (full width at half maximum) was measured for the first time in photoproduction from a proton target using CLAS at Jefferson Lab. Differential cross sections were obtained via the eta pi(+)pi(-), K+(K) over bar (0) pi(-), and (K-K0)pi(+) decay channels from threshold up to a center-of-mass energy of 2.8 GeV. The mass, width, and an amplitude analysis of the eta pi(+)pi(-) final-state Dalitz distribution are...
Show moreThe f(1)(1285) meson withmass 1281.0 +/- 0.8MeV/c(2) and width 18.4 +/- 1.4MeV (full width at half maximum) was measured for the first time in photoproduction from a proton target using CLAS at Jefferson Lab. Differential cross sections were obtained via the eta pi(+)pi(-), K+(K) over bar (0) pi(-), and (K-K0)pi(+) decay channels from threshold up to a center-of-mass energy of 2.8 GeV. The mass, width, and an amplitude analysis of the eta pi(+)pi(-) final-state Dalitz distribution are consistent with the axial-vector J(P) = 1(+) f(1)(1285) identity, rather than the pseudoscalar 0(-) eta(1295). The production mechanism is more consistent with s-channel decay of a high-mass N* state and not with t-channel meson exchange. Decays to eta pi pi go dominantly via the intermediate a(0)(+/-) (980)pi(-/+) states, with the branching ratio Gamma [a(0)pi (no (K) over barK)]/Gamma[eta pi pi (all)] = 0.74 +/- 0.09. The branching ratios Gamma (K (K) over bar pi)/Gamma(eta pi pi) = 0.216 +/- 0.033 and Gamma (gamma rho(0))/Gamma(eta pi pi) = 0.047 +/- 0.018 were also obtained. The first is in agreement with previous data for the f(1)(1285), while the latter is lower than the world average.
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Date Issued: 2016-06-09
Identifier: FSU_libsubv1_wos_000377500200001, 10.1103/PhysRevC.93.065202
Format: Citation

Title: Photoproduction Of Lambda And Sigma(0) Hyperons Using Linearly Polarized Photons.
Creator: Paterson, C. A., Ireland, D. G., Livingston, K., McKinnon, B., Adhikari, K. P., Adikaram, D., Akbar, Z., Amaryan, M., Pereira, S. Anefalos, Badui, R. A., Ball, J., Baltzell, N....
Show morePaterson, C. A., Ireland, D. G., Livingston, K., McKinnon, B., Adhikari, K. P., Adikaram, D., Akbar, Z., Amaryan, M., Pereira, S. Anefalos, Badui, R. A., Ball, J., Baltzell, N. A., Battaglieri, M., Bedlinskiy, I., Biselli, A., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Compton, N., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., De Vita, R., Deur, A., Djalali, C., Dugger, M., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J. A., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Glazier, D. I., Gleason, C., Gothe, R. W., Griffioen, K. A., Guo, L., Hafidi, K., Harrison, N., Hattawy, M., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jiang, H., Joo, K., Keller, D., Khachatryan, G., Khandaker, M., Kim, W., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Lanza, L., Lenisa, P., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mattione, P., Mayer, C. A., McCracken, M. E., Mokeev, V., Movsisyan, A., Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Net, L. A., Ni, A., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Pasyuk, E., Peng, P., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Roy, P., Sabatie, F., Salgado, C., Schumacher, R. A., Seder, E., Sharabian, Y. G., Skorodumina, Iu, Smith, G. D., Sober, D. I., Sokhan, D., Sparveris, N., Strakovsky, I. I., Strauch, S., Sytnik, V., Taiuti, M., Torayev, B., Tucker, R., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Zachariou, N., Zana, L., Zhang, J., Zonta, I.
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Abstract/Description: Background: Measurements of polarization observables for the reactions (gamma) over right arrowp -> K+ Lambda and (gamma) over right arrowp -> K+ Sigma(0) have been performed. This is part of a program of measurements designed to study the spectrum of baryon resonances in particular, and nonperturbative QCD in general. Purpose: The accurate measurement of several polarization observables provides tight constraints for phenomenological fits, which allow the study of strangeness in nucleon and...
Show moreBackground: Measurements of polarization observables for the reactions (gamma) over right arrowp -> K+ Lambda and (gamma) over right arrowp -> K+ Sigma(0) have been performed. This is part of a program of measurements designed to study the spectrum of baryon resonances in particular, and nonperturbative QCD in general. Purpose: The accurate measurement of several polarization observables provides tight constraints for phenomenological fits, which allow the study of strangeness in nucleon and nuclear systems. Beam-recoil observables for the (gamma) over right arrowp -> K+ Sigma(0) reaction have not been reported before now. Method: Themeasurements were carried out using linearly polarized photon beams incident on a liquid hydrogen target, and the CLAS detector at the Thomas Jefferson National Accelerator Facility. The energy range of the results is 1.71 < W < 2.19 GeV, with an angular range -0.75 < cos theta(K)* < +0.85. Results: The observables extracted for both reactions are beam asymmetry Sigma, target asymmetry T, and the beam-recoil double polarization observables O-x and O-z. Conclusions: Comparison with theoretical fits indicates that, in the regions where no previous data existed, the new data contain significant new information, and strengthen the evidence for the set of resonances used in the latest Bonn-Gatchina fit.
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Date Issued: 2016-06-08
Identifier: FSU_libsubv1_wos_000377302700004, 10.1103/PhysRevC.93.065201
Format: Citation

Title: Nuclear mass predictions for the crustal composition of neutron stars: A Bayesian neural network approach.
Creator: Utama, R., Piekarewicz, J., Prosper, H. B.
Abstract/Description: Background: Besides their intrinsic nuclear-structure value, nuclear mass models are essential for astrophysical applications, such as r-process nucleosynthesis and neutron-star structure. Purpose: To overcome the intrinsic limitations of existing "state-of-the-art" mass models through a refinement based on a Bayesian neural network (BNN) formalism. Methods: A novel BNN approach is implemented with the goal of optimizing mass residuals between theory and experiment. Results: A significant...
Show moreBackground: Besides their intrinsic nuclear-structure value, nuclear mass models are essential for astrophysical applications, such as r-process nucleosynthesis and neutron-star structure. Purpose: To overcome the intrinsic limitations of existing "state-of-the-art" mass models through a refinement based on a Bayesian neural network (BNN) formalism. Methods: A novel BNN approach is implemented with the goal of optimizing mass residuals between theory and experiment. Results: A significant improvement (of about 40%) in the mass predictions of existing models is obtained after BNN refinement. Moreover, these improved results are now accompanied by proper statistical errors. Finally, by constructing a "world average" of these predictions, a mass model is obtained that is used to predict the composition of the outer crust of a neutron star. Conclusions: The power of the Bayesian neural network method has been successfully demonstrated by a systematic improvement in the accuracy of the predictions of nuclear masses. Extension to other nuclear observables is a natural next step that is currently under investigation.
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Date Issued: 2016-01-20
Identifier: FSU_libsubv1_wos_000368514400002, 10.1103/PhysRevC.93.014311
Format: Citation

Title: Persistence of collective behavior at high spin in the N = 88 nucleus 153Tb.
Creator: Hartley, D. J., Riley, M. A., Wang, X., Miller, S,, Jassens, R. V.F., Paul, E, S,, Rees, J. M., Simpson, J., Riedinger, L. L., Ayangeakaa, A. D., Carpenter, M. P., Chiara, C. J....
Show moreHartley, D. J., Riley, M. A., Wang, X., Miller, S,, Jassens, R. V.F., Paul, E, S,, Rees, J. M., Simpson, J., Riedinger, L. L., Ayangeakaa, A. D., Carpenter, M. P., Chiara, C. J., Garg, U., Hampson, P., Hoffman, C. R., Kondev, F. G., Lauritsen, T., Mason, P. J. R., Matta, J. T., Nolan, P. J., Ollier, J., Petri, M., Radford, D. C., Revill, J. P., Zhu, S., Ragnarsson, I.
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Abstract/Description: Excited states in the N = 88 nucleus 153Tb were observed up to spin ∼40 in an experiment utilizing the Gammasphere array. The 153Tb states were populated in a weak α4n evaporation channel of the 37Cl + 124Sn reaction. Two previously known sequences were extended to higher spins, and a new decoupled structure was identified. The πh11/2 band was observed in the spin region where other N = 88 isotopes exhibit effects of prolate to oblate shape changes leading to band termination along the yrast...
Show moreExcited states in the N = 88 nucleus 153Tb were observed up to spin ∼40 in an experiment utilizing the Gammasphere array. The 153Tb states were populated in a weak α4n evaporation channel of the 37Cl + 124Sn reaction. Two previously known sequences were extended to higher spins, and a new decoupled structure was identified. The πh11/2 band was observed in the spin region where other N = 88 isotopes exhibit effects of prolate to oblate shape changes leading to band termination along the yrast line, whereas 153Tb displays a persistent collective behavior. However, minor perturbations of the very highest state in both signatures of this h11/2 band are observed, which perhaps signal the start of the transition towards band termination.
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Date Issued: 2015-05-29
Identifier: FSU_libsubv1_scholarship_submission_1493411129, 10.1103/PhysRevC.91.05
Format: Citation

Title: Double K-s(0) Photoproduction Off The Proton At Clas.
Creator: Chandavar, S., Goetz, J. T., Hicks, K., Keller, D., Kunkel, M. C., Paolone, M., Weygand, D. P., Adhikari, K. P., Adhikari, S., Akbar, Z., Ball, J., Balossino, I., Barion, L.,...
Show moreChandavar, S., Goetz, J. T., Hicks, K., Keller, D., Kunkel, M. C., Paolone, M., Weygand, D. P., Adhikari, K. P., Adhikari, S., Akbar, Z., Ball, J., Balossino, I., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Cao, F., Carman, D. S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clark, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Defurne, M., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Filippi, A., Fradi, A., Gavalian, G., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Glazier, D. I., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Holtrop, M., Ilieva, Y., Ireland, D. G., Isupov, E. L., Jenkins, D., Johnston, S., Joo, K., Joosten, S., Kabir, M. L., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Lanza, L., Lenisa, P., Livingston, K., MacGregor, I. J. D., Markov, N., McCracken, M. E., McKinnon, B., Meyer, C. A., Mineeva, T., Mokeev, V., Movsisyan, A., Camacho, C. Munoz, Nadel-Turonski, P., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Raue, B. A., Ripani, M., Riser, D., Ritchie, B. G., Rizzo, A., Rosner, G., Sabatie, F., Salgado, C., Schumacher, R. A., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu, Sokhan, D., Smith, G. D., Sparveris, N., Stepanyan, S., Strakovsky, I. I., Strauch, S., Ungaro, M., Voutier, E., Wei, X., Zachariou, N., Zhang, J., Zhao, Z. W.
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Abstract/Description: The f(0)(1500) meson resonance is one of several contenders to have significant mixing with the lightest glueball. This resonance is well established from several previous experiments. Here we present the first photoproduction data for the f(0)(1500) via decay into the K-S(0) K-S(0) channel using the CLAS detector. The reaction gamma p -> fJp -> K-S(0) K-S(0) p, where J = 0,2, was measured with photon energies from 2.7-5.1 GeV. Aclear peak is seen at 1500 MeV in the background subtracted...
Show moreThe f(0)(1500) meson resonance is one of several contenders to have significant mixing with the lightest glueball. This resonance is well established from several previous experiments. Here we present the first photoproduction data for the f(0)(1500) via decay into the K-S(0) K-S(0) channel using the CLAS detector. The reaction gamma p -> fJp -> K-S(0) K-S(0) p, where J = 0,2, was measured with photon energies from 2.7-5.1 GeV. Aclear peak is seen at 1500 MeV in the background subtracted invariant mass spectra of the two kaons. This is enhanced if the measured four-momentum transfer to the proton target is restricted to be less than 1.0 GeV2. By comparing data with simulations, it can be concluded that the peak at 1500 MeV is produced primarily at low t, which is consistent with a t-channel production mechanism.
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Date Issued: 2018-02-26
Identifier: FSU_libsubv1_wos_000426043700006, 10.1103/PhysRevC.97.025203
Format: Citation

Title: Determination Of The Real Part Of The Eta '-nb Optical Potential.
Creator: Nanova, M., Friedrich, S., Metag, V., Paryev, E. Ya, Afzal, F. N., Bayadilov, D., Beck, R., Becker, M., Boese, S., Brinkmann, K.-T., Crede, V., Elsner, D., Frommberger, F.,...
Show moreNanova, M., Friedrich, S., Metag, V., Paryev, E. Ya, Afzal, F. N., Bayadilov, D., Beck, R., Becker, M., Boese, S., Brinkmann, K.-T., Crede, V., Elsner, D., Frommberger, F., Gruener, M., Gutz, E., Hammann, Ch, Hannappel, J., Hartmann, J., Hillert, W., Hoffmeister, P., Honisch, Ch, Jude, T., Kalischewski, F., Keshelashvili, I., Klein, F., Koop, K., Krusche, B., Lang, M., Makonyi, K., Messi, F., Mueller, J., Muellers, J., Piontek, D.-M., Rostomyan, T., Schaab, D., Schmidt, C., Schmieden, H., Schmitz, R., Seifen, T., Sowa, C., Spieker, K., Thiel, A., Thoma, U., Triffterer, T., Urban, M., van Pee, H., Walther, D., Wendel, C., Werthmuller, D., Wiedner, U., Wilson, A., Witthauer, L., Wunderlich, Y., Zaunick, H.-G.
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Abstract/Description: The excitation function and momentum distribution of eta' mesons have been measured in photoproduction off Nb-93 in the energy range of 1.2-2.9 GeV. The experiment has been performed with the combined Crystal Barrel and MiniTAPS detector system, using tagged photon beams from the ELSA electron accelerator. Information on the sign and magnitude of the real part of the eta'-Nb potential has been extracted from a comparison of the data with model calculations. An attractive potential of -(41 +/-...
Show moreThe excitation function and momentum distribution of eta' mesons have been measured in photoproduction off Nb-93 in the energy range of 1.2-2.9 GeV. The experiment has been performed with the combined Crystal Barrel and MiniTAPS detector system, using tagged photon beams from the ELSA electron accelerator. Information on the sign and magnitude of the real part of the eta'-Nb potential has been extracted from a comparison of the data with model calculations. An attractive potential of -(41 +/- 10(stat) +/- 15(syst)) MeV depth at normal nuclear matter density is deduced within model uncertainties. This value is consistent with the potential depth of -(37 +/- 10(stat) +/- 10(syst)) MeV obtained in an earlier measurement for a light nucleus (carbon). This relatively shallow eta'-nucleus potential will make the search for eta'-nucleus bound states more difficult.
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Date Issued: 2016-08-31
Identifier: FSU_libsubv1_wos_000383045100006, 10.1103/PhysRevC.94.025205
Format: Citation

Title: Difference In Proton Radii Of Mirror Nuclei As A Possible Surrogate For The Neutron Skin.
Creator: Yang, Junjie, Piekarewicz, J.
Abstract/Description: It has recently been suggested that differences in the charge radii of mirror nuclei are proportional to the neutron-skin thickness of neutron-rich nuclei and to the slope of the symmetry energy L [Brown, Phys. Rev. Lett. 102, 122502 (2009)]. The determination of the neutron skin has important implications for nuclear physics and astrophysics. Although the use of electroweak probes provides a largely model-independent determination of the neutron skin, the experimental challenges are enormous...
Show moreIt has recently been suggested that differences in the charge radii of mirror nuclei are proportional to the neutron-skin thickness of neutron-rich nuclei and to the slope of the symmetry energy L [Brown, Phys. Rev. Lett. 102, 122502 (2009)]. The determination of the neutron skin has important implications for nuclear physics and astrophysics. Although the use of electroweak probes provides a largely model-independent determination of the neutron skin, the experimental challenges are enormous. Thus, the possibility that differences in the charge radii of mirror nuclei may be used as a surrogate for the neutron skin is a welcome alternative. To test the validity of this assumption we perform calculations based on a set of relativistic energy density functionals that span a wide region of values of L. Our results confirm that the difference in charge radii between various neutron-deficient nickel isotopes and their corresponding mirror nuclei is indeed strongly correlated to both the neutron-skin thickness and L. Moreover, given that various neutron-star properties are also sensitive to L, a data-to-data relation emerges between the difference in charge radii of mirror nuclei and the radius of low-mass neutron stars.
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Date Issued: 2018-01-22
Identifier: FSU_libsubv1_wos_000423230200005, 10.1103/PhysRevC.97.014314
Format: Citation

Title: gamma-soft Ba-146 and the role of nonaxial shapes at N approximate to 90.
Creator: Mitchell, A. J., Lister, C. J., McCutchan, E. A., Albers, M., Ayangeakaa, A. D., Bertone, P. F., Carpenter, M. P., Chiara, C. J., Chowdhury, P., Clark, J. A., Copp, P., David, H...
Show moreMitchell, A. J., Lister, C. J., McCutchan, E. A., Albers, M., Ayangeakaa, A. D., Bertone, P. F., Carpenter, M. P., Chiara, C. J., Chowdhury, P., Clark, J. A., Copp, P., David, H. M., Deo, A. Y., DiGiovine, B., D'Olympia, N., Dungan, R., Harding, R. D., Harker, J., Hota, S. S., Janssens, R. V. F., Kondev, F. G., Liu, S. H., Ramayya, A. V., Rissanen, J., Savard, G., Seweryniak, D., Shearman, R., Sonzogni, A. A., Tabor, S. L., Walters, W. B., Wang, E., Zhu, S.
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Abstract/Description: Low-spin states in the neutron-rich, N = 90 nuclide Ba-146 were populated following beta decay of Cs-146, with the goal of clarifying the development of deformation in barium isotopes through delineation of their nonyrast structures. Fission fragments of Cs-146 were extracted from a 1.7-Ci Cf-252 source and mass selected using the CAlifornium Rare Ion Breeder Upgrade (CARIBU) facility. Low-energy ions were deposited at the center of a box of thin beta detectors, surrounded by a highly...
Show moreLow-spin states in the neutron-rich, N = 90 nuclide Ba-146 were populated following beta decay of Cs-146, with the goal of clarifying the development of deformation in barium isotopes through delineation of their nonyrast structures. Fission fragments of Cs-146 were extracted from a 1.7-Ci Cf-252 source and mass selected using the CAlifornium Rare Ion Breeder Upgrade (CARIBU) facility. Low-energy ions were deposited at the center of a box of thin beta detectors, surrounded by a highly efficient high-purity Ge array. The new Ba-146 decay scheme now contains 31 excited levels extending up to similar to 2.5 MeV excitation energy, double what was previously known. These data are compared to predictions from the interacting boson approximation (IBA) model. It appears that the abrupt shape change found at N = 90 in Sm and Gd is much more gradual in Ba and Ce, due to an enhanced role of the gamma degree of freedom.
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Date Issued: 2016-01-12
Identifier: FSU_libsubv1_wos_000367895600001, 10.1103/PhysRevC.93.014306
Format: Citation

Title: Power Of Two.
Creator: Piekarewicz, J., Linero, A. R., Giuliani, P., Chicken, E.
Abstract/Description: Background: Besides its intrinsic value as a fundamental nuclear-structure observable, the weak-charge density of Pb-208-a quantity that is closely related to its neutron distribution-is of fundamental importance in constraining the equation of state of neutron-rich matter. Purpose: To assess the impact that a second electroweak measurement of the weak-charge form factor of Pb-208 may have on the determination of its overall weak-charge density. Methods: Using the two putative experimental...
Show moreBackground: Besides its intrinsic value as a fundamental nuclear-structure observable, the weak-charge density of Pb-208-a quantity that is closely related to its neutron distribution-is of fundamental importance in constraining the equation of state of neutron-rich matter. Purpose: To assess the impact that a second electroweak measurement of the weak-charge form factor of Pb-208 may have on the determination of its overall weak-charge density. Methods: Using the two putative experimental values of the form factor, together with a simple implementation of Bayes' theorem, we calibrate a theoretically sound-yet surprisingly little known-symmetrized Fermi function, that is characterized by a density and form factor that are both known exactly in closed form. Results: Using the charge form factor of Pb-208 as a proxy for its weak-charge form factor, we demonstrate that using only two experimental points to calibrate the symmetrized Fermi function is sufficient to accurately reproduce the experimental charge form factor over a significant range of momentum transfers. Conclusions: It is demonstrated that a second measurement of the weak-charge form factor of Pb-208 supplemented by a robust theoretical input in the form of the symmetrized Fermi function would place significant constraints on the neutron distribution of Pb-208. In turn, such constraints will become vital in the interpretation of hadronic experiments that will probe the neutron-rich skin of exotic nuclei at future radioactive beam facilities.
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Date Issued: 2016-09-15
Identifier: FSU_libsubv1_wos_000383149400001, 10.1103/PhysRevC.94.034316
Format: Citation

Title: Sensitivity Of The Fusion Cross Section To The Density Dependence Of The Symmetry Energy.
Creator: Reinhard, P.-G., Umar, A. S., Stevenson, P. D., Piekarewicz, J., Oberacker, V. E., Maruhn, J. A.
Abstract/Description: Background: The study of the nuclear equation of state (EOS) and the behavior of nuclear matter under extreme conditions is crucial to our understanding of many nuclear and astrophysical phenomena. Nuclear reactions serve as one of the means for studying the EOS. Purpose: It is the aim of this paper to discuss the impact of nuclear fusion on the EOS. This is a timely subject given the expected availability of increasingly exotic beams at rare isotope facilities [A. B. Balantekin et al., Mod....
Show moreBackground: The study of the nuclear equation of state (EOS) and the behavior of nuclear matter under extreme conditions is crucial to our understanding of many nuclear and astrophysical phenomena. Nuclear reactions serve as one of the means for studying the EOS. Purpose: It is the aim of this paper to discuss the impact of nuclear fusion on the EOS. This is a timely subject given the expected availability of increasingly exotic beams at rare isotope facilities [A. B. Balantekin et al., Mod. Phys. Lett. A 29, 1430010 (2014)]. In practice, we focus on Ca-48+Ca-48 fusion. Method: We employ three different approaches to calculate fusion cross sections for a set of energy density functionals with systematically varying nuclear matter properties. Fusion calculations are performed using frozen densities, using a dynamic microscopic method based on density-constrained time-dependent Hartree-Fock (DC-TDHF) approach, as well as direct TDHF study of above barrier cross sections. For these studies, we employ a family of Skyrme parametrizations with systematically varied nuclear matter properties. Results: The folding-potential model provides a reasonable first estimate of cross sections. DC-TDHF, which includes dynamical polarization, reduces the fusion barriers and delivers much better cross sections. Full TDHF near the barrier agrees nicely with DC-TDHF. Most of the Skyrme forces which we used deliver, on the average, fusion cross sections in good agreement with the data. Trying to read off a trend in the results, we find a slight preference for forces which deliver a slope of symmetry energy of L approximate to 50 MeV that corresponds to a neutron-skin thickness of Ca-48 of R-skin = (0.180-0.210) fm. Conclusions: Fusion reactions in the barrier and sub-barrier region can be a tool to study the EOS and the neutron skin of nuclei. The success of the approach will depend on reduced experimental uncertainties of fusion data as well as the development of fusion theories that closely couple to the microscopic structure and dynamics.
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Date Issued: 2016-04-28
Identifier: FSU_libsubv1_wos_000374956300001, 10.1103/PhysRevC.93.044618
Format: Citation

Title: Validating Neural-network Refinements Of Nuclear Mass Models.
Creator: Utama, R., Piekarewicz, J.
Abstract/Description: Background: Nuclear astrophysics centers on the role of nuclear physics in the cosmos. In particular, nuclear masses at the limits of stability are critical in the development of stellar structure and the origin of the elements. Purpose: We aim to test and validate the predictions of recently refined nuclear mass models against the newly published AME2016 compilation. Methods: The basic paradigm underlining the recently refined nuclear mass models is based on existing state-of-the-art models...
Show moreBackground: Nuclear astrophysics centers on the role of nuclear physics in the cosmos. In particular, nuclear masses at the limits of stability are critical in the development of stellar structure and the origin of the elements. Purpose: We aim to test and validate the predictions of recently refined nuclear mass models against the newly published AME2016 compilation. Methods: The basic paradigm underlining the recently refined nuclear mass models is based on existing state-of-the-art models that are subsequently refined through the training of an artificial neural network. Bayesian inference is used to determine the parameters of the neural network so that statistical uncertainties are provided for all model predictions. Results: We observe a significant improvement in the Bayesian neural network (BNN) predictions relative to the corresponding "bare" models when compared to the nearly 50 new masses reported in the AME2016 compilation. Further, AME2016 estimates for the handful of impactful isotopes in the determination of r-process abundances are found to be in fairly good agreement with our theoretical predictions. Indeed, the BNN-improved Duflo-Zuker model predicts a root-mean-square deviation relative to experiment of sigma(rms) similar or equal to 400 keV. Conclusions: Given the excellent performance of the BNN refinement in confronting the recently published AME2016 compilation, we are confident of its critical role in our quest for mass models of the highest quality. Moreover, as uncertainty quantification is at the core of the BNN approach, the improved mass models are in a unique position to identify those nuclei that will have the strongest impact in resolving some of the outstanding questions in nuclear astrophysics.
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Date Issued: 2018-01-16
Identifier: FSU_libsubv1_wos_000423123400001, 10.1103/PhysRevC.97.014306
Format: Citation

Title: Reaction Rate For Carbon Burning In Massive Stars.
Creator: Jiang, C. L., Santiago-Gonzalez, D., Almaraz-Calderon, S., Rehm, K. E., Back, B. B., Auranen, K., Avila, M. L., Ayangeakaa, A. D., Bottoni, S., Carpenter, M. P., Dickerson, C.,...
Show moreJiang, C. L., Santiago-Gonzalez, D., Almaraz-Calderon, S., Rehm, K. E., Back, B. B., Auranen, K., Avila, M. L., Ayangeakaa, A. D., Bottoni, S., Carpenter, M. P., Dickerson, C., DiGiovine, B., Greene, J. P., Hoffman, C. R., Janssens, R. V. F., Kay, B. P., Kuvin, S. A., Lauritsen, T., Pardo, R. C., Sethi, J., Seweryniak, D., Talwar, R., Ugalde, C., Zhu, S., Bourgin, D., Courtin, S., Haas, F., Heine, M., Fruet, G., Montanari, D., Jenkins, D. G., Morris, L., Lefebvre-Schuhl, A., Alcorta, M., Fang, X., Tang, X. D., Bucher, B., Deibel, C. M., Marley, S. T.
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Abstract/Description: Carbon burning is a critical phase for nucleosynthesis in massive stars. The conditions for igniting this burning stage, and the subsequent isotope composition of the resulting ashes, depend strongly on the reaction rate for C-12 + C-12 fusion at very low energies. Results for the cross sections for this reaction are influenced by various backgrounds encountered in measurements at such energies. In this paper, we report on a new measurement of C-12 + C-12 fusion cross sections where these...
Show moreCarbon burning is a critical phase for nucleosynthesis in massive stars. The conditions for igniting this burning stage, and the subsequent isotope composition of the resulting ashes, depend strongly on the reaction rate for C-12 + C-12 fusion at very low energies. Results for the cross sections for this reaction are influenced by various backgrounds encountered in measurements at such energies. In this paper, we report on a new measurement of C-12 + C-12 fusion cross sections where these backgrounds have been minimized. It is found that the astrophysical S factor exhibits a maximum around E-cm = 3.5-4.0 MeV, which leads to a reduction of the previously predicted astrophysical reaction rate.
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Date Issued: 2018-01-10
Identifier: FSU_libsubv1_wos_000419707600002, 10.1103/PhysRevC.97.012801
Format: Citation

Title: Radiative Decay Of Neutron-unbound Intruder States In O-19.
Creator: Dungan, R., Tabor, S. L., Tripathi, Vandana, Volya, A., Kravvaris, K., Abromeit, B., Caussyn, D. D., Morrow, S., Parker, J. J., Tai, P.-L., VonMoss, J. M.
Abstract/Description: The Be-9(C-14, alpha gamma) reaction at E-Lab = 30 and 35 MeV was used to study excited states of O-19. The Florida State University (FSU) gamma detector array was used to detect gamma radiation in coincidence with charged particles detected and identified with a silicon Delta E-E particle telescope. gamma decays have been observed for the first time from six states ranging from 368 to 2147 keV above the neutron separation energy (S-n = 3962 keV) in O-19. The gamma-decaying states are...
Show moreThe Be-9(C-14, alpha gamma) reaction at E-Lab = 30 and 35 MeV was used to study excited states of O-19. The Florida State University (FSU) gamma detector array was used to detect gamma radiation in coincidence with charged particles detected and identified with a silicon Delta E-E particle telescope. gamma decays have been observed for the first time from six states ranging from 368 to 2147 keV above the neutron separation energy (S-n = 3962 keV) in O-19. The gamma-decaying states are interspersed among states previously observed to decay by neutron emission. The ability of electromagnetic decay to compete successfully with neutron decay is explained in terms of neutron angular momentum barriers and small spectroscopic factors implying higher spin and complex structure for these intruder states. These results illustrate the need for complementary experimental approaches to best illuminate the complete nuclear structure.
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Date Issued: 2016-02-22
Identifier: FSU_libsubv1_wos_000370798600001, 10.1103/PhysRevC.93.021302
Format: Citation

Title: Structure Of C-14 And B-14 From The C-14,c-15(d,he-3)b-13,b-14 Reactions.
Creator: Bedoor, S., Wuosmaa, A. H., Albers, M., Alcorta, M., Almaraz-Calderon, Sergio, Back, B. B., Bertone, P. F., Deibel, C. M., Hoffman, C. R., Lighthall, J. C., Marley, S. T.,...
Show moreBedoor, S., Wuosmaa, A. H., Albers, M., Alcorta, M., Almaraz-Calderon, Sergio, Back, B. B., Bertone, P. F., Deibel, C. M., Hoffman, C. R., Lighthall, J. C., Marley, S. T., Mcneel, D. G., Pardo, R. C., Rehm, K. E., Schiffer, J. P., Shetty, D. V.
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Abstract/Description: We have studied the C-14,C-15(d,He-3)B-13,B-14 proton-removing reactions in inverse kinematics. The (d,He-3) reaction probes the proton occupation of the target ground state, and also provides spectroscopic information about the final states in B-13,B-14. The experiments were performed using C-14,C-15 beams from the ATLAS accelerator at Argonne National Laboratory. The reaction products were analyzed with the HELIOS device. Angular distributions were obtained for transitions from both...
Show moreWe have studied the C-14,C-15(d,He-3)B-13,B-14 proton-removing reactions in inverse kinematics. The (d,He-3) reaction probes the proton occupation of the target ground state, and also provides spectroscopic information about the final states in B-13,B-14. The experiments were performed using C-14,C-15 beams from the ATLAS accelerator at Argonne National Laboratory. The reaction products were analyzed with the HELIOS device. Angular distributions were obtained for transitions from both reactions. The C-14-beam data reveal transitions to excited states in B-13 that suggest configurations with protons outside the pi(0p(3/2)) orbital, and some possibility of proton cross-shell 0p-1s0d excitations, in the C-14 ground state. The C-15-beam data confirm the existence of a broad 2(-) excited state in B-14. The experimental data are compared to the results of shell-model calculations.
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Date Issued: 2016-04-21
Identifier: FSU_libsubv1_wos_000374546400004, 10.1103/PhysRevC.93.044323
Format: Citation

Title: Sub-coulomb He-3 Transfer And Its Use To Extract Three-particle Asymptotic Normalization Coefficients.
Creator: Avila, M. L., Baby, L. T., Belarge, J., Keeley, N., Kemper, K. W., Koshchiy, E., Kuchera, A. N., Rogachev, G. V., Rusek, K., Santiago-Gonzalez, D.
Abstract/Description: Data for the C-13(Li-6, t)O-16 reaction, obtained in inverse kinematics at a C-13 incident energy of 7.72 MeV, are presented. A distorted wave Born approximation (DWBA) analysis was used to extract spectroscopic factors and asymptotic normalization coefficients (ANCs) for the < O-16 vertical bar C-13 + He-3 > overlaps, subject to the assumption of a fixed < Li-6 vertical bar He-3 + H-3 > overlap. The variation of the extracted spectroscopic factors and ANCs as a function of various inputs to...
Show moreData for the C-13(Li-6, t)O-16 reaction, obtained in inverse kinematics at a C-13 incident energy of 7.72 MeV, are presented. A distorted wave Born approximation (DWBA) analysis was used to extract spectroscopic factors and asymptotic normalization coefficients (ANCs) for the < O-16 vertical bar C-13 + He-3 > overlaps, subject to the assumption of a fixed < Li-6 vertical bar He-3 + H-3 > overlap. The variation of the extracted spectroscopic factors and ANCs as a function of various inputs to the DWBA calculations was explored. The extracted ANCs were found to vary as a cubic function of the radius of the potential well binding the transferred He-3 to the C-13 core while the spectroscopic factors varied as a quartic function of the radius. The ANC values could be determined to within a factor of two for this system.
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Date Issued: 2018-01-22
Identifier: FSU_libsubv1_wos_000423230200004, 10.1103/PhysRevC.97.014313
Format: Citation

Title: Target And Beam-target Spin Asymmetries In Exclusive Pion Electroproduction For Q(2) > 1 Gev2. I. Ep -> E Pi(+)n.
Creator: Bosted, P. E., Amaryan, M. J., Pereira, S. Anefalos, Avakian, H., Badui, R. A., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S.,...
Show moreBosted, P. E., Amaryan, M. J., Pereira, S. Anefalos, Avakian, H., Badui, R. A., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Briscoe, W. J., Bultmann, S., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Crede, V., D'Angelo, A., De Vita, R., Deur, A., De Sanctis, E., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J. A., Forest, T., Fradi, A., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Hakobyan, H., Hattawy, M., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jiang, H., Jo, H. S., Joo, K., Joosten, S., Khachatryan, G., Khandaker, M., Kim, A., Kim, W., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Lanza, L., Net, L. A., Lenisa, P., Livingston, K., MacGregor, I. J. D., McCracken, M. E., McKinnon, B., Meyer, C. A., Mirazita, M., Mokeev, V. I., Montgomery, R. A., Munevar, E., Camacho, C. Munoz, Murdoch, G., Nadel-Turonski, P., Niccolai, S., Osipenko, M., Ostrovidov, A. I., Park, K., Pasyuk, E., Peng, P., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Ripani, M., Rosner, G., Rossi, P., Schumacher, R. A., Seder, E., Skorodumina, Iu, Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Wei, X., Weinstein, L. B., Zachariou, N., Zhang, J., Zhao, Z. W., Zonta, I.
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Abstract/Description: Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive pi(+) electroproduction reaction. gamma(*) p -> n pi(+). The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic range covered is 1.1 < W < 3 GeV and 1 < Q(2) < 6 GeV2. Results were obtained for about 6000 bins in W, Q(2), cos(theta(*)), and...
Show moreBeam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive pi(+) electroproduction reaction. gamma(*) p -> n pi(+). The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic range covered is 1.1 < W < 3 GeV and 1 < Q(2) < 6 GeV2. Results were obtained for about 6000 bins in W, Q(2), cos(theta(*)), and phi(*). Except at forward angles, very large target-spin asymmetries are observed over the entire W region. Reasonable agreement is found with phenomenological fits to previous data for W < 1.6 GeV, but very large differences are seen at higher values of W. A generalized parton distributions (GPD)-based model is in poor agreement with the data. When combined with cross-sectional measurements, the present results provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q(2), for resonances with masses as high as 2.4 GeV.
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Date Issued: 2017-03-20
Identifier: FSU_libsubv1_wos_000399238200004, 10.1103/PhysRevC.95.035206
Format: Citation

Title: Target And Beam-target Spin Asymmetries In Exclusive Pion Electroproduction For Q(2) > 1 Gev2. Ii. Ep -> E Pi(0) P.
Creator: Bosted, P. E., Kim, A., Adhikari, K. P., Adikaram, D., Akbar, Z., Amaryan, M. J., Pereira, S. Anefalos, Avakian, H., Badui, R. A., Ball, J., Balossino, I., Battaglieri, M.,...
Show moreBosted, P. E., Kim, A., Adhikari, K. P., Adikaram, D., Akbar, Z., Amaryan, M. J., Pereira, S. Anefalos, Avakian, H., Badui, R. A., Ball, J., Balossino, I., Battaglieri, M., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bultmann, S., Burkert, V. D., Cao, T., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fanchini, E., Fedotov, G., Fegan, S., Fersch, R., Filippi, A., Fleming, J. A., Forest, T. A., Fradi, A., Ghandilyan, Y., Gilfoyle, G. P., Girod, F. X., Glazier, D. I., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guidal, M., Guler, N., Hakobyan, H., Guo, L., Hafidi, K., Hakobyan, H., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Hollis, G., Holtrop, M., Hughes, S. M., Ireland, D. G., Isupov, E. L., Jenkins, D., Jiang, H., Jo, H. S., Joo, K., Keller, D., Khachatryan, G., Khandaker, M., Kim, W., Klei, A., Klein, F. J., Koirala, S., Kubarovsky, V., Kuhn, S. E., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Markov, N., Mayer, M., McCracken, M. E., McKinnon, B., Mineeva, T., Mirazita, M., Mokeev, V. I., Montgomery, R. A., Movsisyan, A., Camacho, C. Munoz, Murdoch, G., Nadel-Turonski, P., Ni, A., Niccolai, S., Niculescu, G., Osipenko, M., Ostrovidov, A. I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Prok, Y., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatie, F., Saini, M. S., Schumacher, R. A., Seder, E., Sharabian, Y. G., Skorodumina, Iu, Smith, G. D., Sokhan, D., Sparveris, N., Stankovic, I., Stepanyan, S., Stoler, P., Strakovsky, I. I., Strauch, S., Taiuti, M., Tian, Ye, Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Zachariou, N., Zhang, J., Zhao, Z. W., Zonta, I.
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Abstract/Description: Beam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive pi(0) electroproduction reaction. gamma(*) p -> p pi(0), expanding an analysis of the. gamma(*) p -> n pi(+) reaction from the same experiment. The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic ranges covered are 1.1 < W < 3 GeV and 1 <...
Show moreBeam-target double-spin asymmetries and target single-spin asymmetries were measured for the exclusive pi(0) electroproduction reaction. gamma(*) p -> p pi(0), expanding an analysis of the. gamma(*) p -> n pi(+) reaction from the same experiment. The results were obtained from scattering of 6-GeV longitudinally polarized electrons off longitudinally polarized protons using the CEBAF Large Acceptance Spectrometer at Jefferson Laboratory. The kinematic ranges covered are 1.1 < W < 3 GeV and 1 < Q(2) < 6 GeV2. Results were obtained for about 5700 bins in W, Q(2), cos(theta(*)), and phi(*). The beam-target asymmetries were found to generally be greater than zero, with relatively modest phi(*) dependence. The target asymmetries exhibit very strong phi(*) dependence, with a change in sign occurring between results at low W and high W, in contrast to pi(+) electroproduction. Reasonable agreement is found with phenomenological fits to previous data for W < 1.6 GeV, but significant differences are seen at higherW. When combined with cross-sectional measurements, as well as pi(+) observables, the present results will provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q(2), for resonances with masses as high as 2.4 GeV.
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Date Issued: 2017-03-20
Identifier: FSU_libsubv1_wos_000399238200005, 10.1103/PhysRevC.95.035207
Format: Citation

Title: Target And Beam-target Spin Asymmetries In Exclusive Pi(+) And Pi(-) Electroproduction With 1.6-to 5.7-gev Electrons.
Creator: Bosted, P. E., Biselli, A. S., Careccia, S., Dodge, G., Fersch, R., Guler, N., Kuhn, S. E., Pierce, J., Prok, Y., Zheng, X., Adhikari, K. P., Adikaram, D., Akbar, Z., Amaryan, M...
Show moreBosted, P. E., Biselli, A. S., Careccia, S., Dodge, G., Fersch, R., Guler, N., Kuhn, S. E., Pierce, J., Prok, Y., Zheng, X., Adhikari, K. P., Adikaram, D., Akbar, Z., Amaryan, M. J., Pereira, S. Anefalos, Asryan, G., Avakian, H., Badui, R. A., Ball, J., Baltzell, N. A., Battaglieri, M., Batourine, V., Bedlinskiy, I., Boiarinov, S., Briscoe, W. J., Bultmann, S., Burkert, V. D., Cao, T., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Chetry, T., Ciullo, G., Clark, L., Colaneri, L., Cole, P. L., Contalbrigo, M., Cortes, O., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Deur, A., Djalali, C., Dupre, R., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fanchini, E., Fedotov, G., Filippi, A., Fleming, J. A., Forest, T. A., Fradi, A., Garcon, M., Gevorgyan, N., Ghandilyan, Y., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gleason, C., Gohn, W., Golovatch, E., Gothe, R. W., Griffioen, K. A., Guo, L., Hafidi, K., Hanretty, C., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Hughes, S. M., Ilieva, Y., Ireland, D. G., Ishkhanov, B. S., Isupov, E. L., Jenkins, D., Jiang, H., Jo, H. S., Joo, K., Joosten, S., Keller, D., Khandaker, M., Kim, W., Klein, A., Klein, F. J., Kubarovsky, V., Kuleshov, S. V., Lanza, L., Lenisa, P., Livingston, K., Lu, H. Y., MacGregor, I. J. D., Markov, N., McCracken, M. E., McKinnon, B., Meyer, C. A., Minehart, R., Mirazita, M., Mokeev, V., Movsisyan, A., Munevar, E., Camacho, C. Munoz, Nadel-Turonski, P., Net, L. A., Ni, A., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A. I., Paremuzyan, R., Park, K., Pasyuk, E., Peng, P., Phelps, W., Pisano, S., Pogorelko, O., Price, J. W., Procureur, S., Protopopescu, D., Puckett, A. J. R., Raue, B. A., Ripani, M., Rizzo, A., Rosner, G., Rossi, P., Roy, P., Sabatie, F., Salgado, C., Schumacher, R. A., Seder, E., Sharabian, Y. G., Simonyan, A., Skorodumina, Iu, Smith, G. D., Sparveris, N., Stankovic, Ivana, Stepanyan, S., Strakovsky, I. I., Strauch, S., Sytnik, V., Taiuti, M., Tian, Ye, Torayev, B., Ungaro, M., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Wei, X., Weinstein, L. B., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., Zhao, Z. W., Zonta, I.
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Abstract/Description: Beam-target double-spin asymmetries and target single-spin asymmetries in exclusive pi(+) and quasiexclusive pi(-) electroproduction were obtained from scattering of 1.6- to 5.7-GeV longitudinally polarized electrons from longitudinally polarized protons (for pi(+)) and deuterons (for pi(-)) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is 1.1 < W < 2.6 GeV and 0.05 < Q(2) < 5 GeV2, with good angular coverage in the forward hemisphere. The...
Show moreBeam-target double-spin asymmetries and target single-spin asymmetries in exclusive pi(+) and quasiexclusive pi(-) electroproduction were obtained from scattering of 1.6- to 5.7-GeV longitudinally polarized electrons from longitudinally polarized protons (for pi(+)) and deuterons (for pi(-)) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is 1.1 < W < 2.6 GeV and 0.05 < Q(2) < 5 GeV2, with good angular coverage in the forward hemisphere. The asymmetry results were divided into approximately 40 000 kinematic bins for pi(+) from free protons and 15 000 bins for pi(-) production from bound nucleons in the deuteron. The present results are found to be in reasonable agreement with fits to previous world data for W < 1.7 GeV and Q(2) < 0.5 GeV2, with discrepancies increasing at higher values of Q(2), especially for W > 1.5 GeV. Very large target-spin asymmetries are observed for W > 1.6 GeV. When combined with cross-section measurements, the present results can provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q(2), for resonances with masses as high as 2.3 GeV.
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Date Issued: 2016-11-01
Identifier: FSU_libsubv1_wos_000386619500002, 10.1103/PhysRevC.94.055201
Format: Citation

Department of Physics (35)	+ -
Department of Statistics (1)	+ -

text (35)	+ -
journal article (19)	+ -

Briscoe, W. J. (12)	+ -
Crede, V. (12)	+ -
Ireland, D. G. (12)	+ -
Livingston, K. (12)	+ -
Schumacher, R. A. (12)	+ -

Strakovsky, I. I. (12)	+ -
Ball, J. (11)	+ -
Battaglieri, M. (11)	+ -
Bedlinskiy, I. (11)	+ -
Burkert, V. D. (11)	+ -
Carman, D. S. (11)	+ -
Celentano, A. (11)	+ -
Ciullo, G. (11)	+ -
Cole, P. L. (11)	+ -
Contalbrigo, M. (11)	+ -
D'Angelo, A. (11)	+ -
De Vita, R. (11)	+ -
Deur, A. (11)	+ -
Djalali, C. (11)	+ -
Dupre, R. (11)	+ -
El Fassi, L. (11)	+ -
Eugenio, P. (11)	+ -
Fedotov, G. (11)	+ -
Gilfoyle, G. P. (11)	+ -
Girod, F. X. (11)	+ -
Gothe, R. W. (11)	+ -
Griffioen, K. A. (11)	+ -
Guo, L. (11)	+ -
Hattawy, M. (11)	+ -
Hicks, K. (11)	+ -

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