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Direct Evidence of Octupole Deformation in Neutron-Rich Ba-144

Title: Direct Evidence of Octupole Deformation in Neutron-Rich Ba-144.
Name(s): Bucher, B., author
Zhu, S., author
Wu, C. Y., author
Janssens, R. V. F., author
Cline, D., author
Hayes, A. B., author
Albers, M., author
Ayangeakaa, A. D., author
Butler, P. A., author
Campbell, C. M., author
Carpenter, M. P., author
Chiara, C. J., author
Clark, J. A., author
Crawford, H. L., author
Cromaz, M., author
David, H. M., author
Dickerson, C., author
Gregor, E. T., author
Harker, J., author
Hoffman, C. R., author
Kay, B. P., author
Kondev, F. G., author
Korichi, A., author
Lauritsen, T., author
Macchiavelli, A. O., author
Pardo, R. C., author
Richard, A., author
Riley, M. A., author
Savard, G., author
Scheck, M., author
Seweryniak, D., author
Smith, M. K., author
Vondrasek, R., author
Wiens, A., author
Type of Resource: text
Genre: Text
Date Issued: 2016-03-17
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The neutron-rich nucleus Ba-144 (t(1/2) = 11.5 s) is expected to exhibit some of the strongest octupole correlations among nuclei with mass numbers A less than 200. Until now, indirect evidence for such strong correlations has been inferred from observations such as enhanced E1 transitions and interleaving positive- and negative-parity levels in the ground-state band. In this experiment, the octupole strength was measured directly by sub-barrier, multistep Coulomb excitation of a post-accelerated 650-MeV Ba-144 beam on a 1.0-mg/cm(2) Pb-208 target. The measured value of the matrix element, < 3(1)(-)parallel to M(E3)parallel to 0(1)(+)> = 0.65((+17)(-23)) eb(3/2,) corresponds to a reduced Bd(E3) transition probability of 48((+25)(-34)) W.u. This result represents an unambiguous determination of the octupole collectivity, is larger than any available theoretical prediction, and is consistent with octupole deformation.
Identifier: FSU_libsubv1_wos_000372432700004 (IID), 10.1103/PhysRevLett.116.112503 (DOI)
Keywords: barium isotopes, deformed-nuclei, energy, ground-state, parity, radioactive beams
Publication Note: The publisher’s version of record is available at
Persistent Link to This Record:
Host Institution: FSU
Is Part Of: Physical Review Letters.
Issue: iss. 11, vol. 116

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Bucher, B., Zhu, S., Wu, C. Y., Janssens, R. V. F., Cline, D., Hayes, A. B., … Wiens, A. (2016). Direct Evidence of Octupole Deformation in Neutron-Rich Ba-144. Physical Review Letters. Retrieved from