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Γ-Ray Spectroscopic Study of Calcium-48,49 and Scandium-50 Focusing on Low Lying Octupole Vibration Excitations

Title: Γ-Ray Spectroscopic Study of Calcium-48,49 and Scandium-50 Focusing on Low Lying Octupole Vibration Excitations.
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Name(s): McPherson, David M. (David Marc), author
Cottle, Paul D. (Paul Davis), professor directing dissertation
Kercheval, Alec N., university representative
Cao, Jianming, 1962-, committee member
Piekarewicz, Jorge, committee member
Riley, Mark A., committee member
Florida State University, degree granting institution
College of Arts and Sciences, degree granting college
Department of Physics, degree granting department
Type of Resource: text
Genre: Text
Issuance: monographic
Date Issued: 2015
Publisher: Florida State University
Place of Publication: Tallahassee, Florida
Physical Form: computer
online resource
Extent: 1 online resource (80 pages)
Language(s): English
Abstract/Description: An inverse kinematic proton scattering experiment was performed at the National Superconducting Cyclotron Laboratory (NSCL) using the GRETINA-S800 detector system in conjunction with the Ursinus College liquid hydrogen target. $\gamma$-ray yields from the experiment were determined using geant4 simulations, generating state population cross sections. These cross sections were used to extract the delta_3 deformation length for the low-lying octupole vibration excitations in Ca-48,49 using the coupled channels analysis code fresco. Particle-core coupling in Ca-49 was studied in comparison to Ca-48 through determination of the neutron and proton deformation lengths. The total inverse kinematic proton scattering deformation lengths were evaluated for the low-lying octupole vibration excitations in Ca-48,49 to be delta_3(Ca-48, 3^-_1) = 1.0(2)fm, delta_3(Ca-49, 9/2^+_1) = 1.2(1)fm, delta_3 (Ca-49, 9/2^+_1) = 1.5(2)fm, delta_3(Ca-49, 5/2^+_1) = 1.1(1)fm. Proton and neutron deformation lengths for two of these octupole states were also determined to be delta_p(Ca-48, 3^-_1) = 0.9(1)fm, delta_p (Ca-49, 9/2^+_1) = 1.0(1)fm, delta_n(Ca-48, 3^-_1) = 1.1(3)fm, and delta_n(Ca-49, 9/2^+_1) = 1.3(3)fm. Additionally, the ratios of the neutron to proton transition matrix elements were also determined for these two states to be M_n/M_p(Ca-48, 3^-_1) = 1.7(6) and M_n/M_p(Ca-49, 9/2^+_1) = 2.0(5). Statistically, the derived values for these two nuclei are nearly identical.
Identifier: FSU_migr_etd-9650 (IID)
Submitted Note: A Dissertation submitted to the Department of Physics in partial fulfillment of the requirements for the degree of Doctor of Philosophy.
Degree Awarded: Summer Semester 2015.
Date of Defense: July 8, 2015.
Keywords: deformation, deformation length, nuclear, octupole, vibration, γ-ray spectroscopy
Bibliography Note: Includes bibliographical references.
Advisory Committee: Paul Cottle, Professor Directing Dissertation; Alec Kercheval, University Representative; Jianming Cao, Committee Member; Jorge Piekarewicz, Committee Member; Mark Riley, Committee Member.
Subject(s): Nuclear physics
Physics
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_migr_etd-9650
Host Institution: FSU

Choose the citation style.
McPherson, D. M. (D. M. ). (2015). Γ-Ray Spectroscopic Study of Calcium-48,49 and Scandium-50 Focusing on Low Lying Octupole Vibration Excitations. Retrieved from http://purl.flvc.org/fsu/fd/FSU_migr_etd-9650