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Low-lying 2(+) states generated by pn-quadrupole correlation and N=28 shell quenching

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Title: Low-lying 2(+) states generated by pn-quadrupole correlation and N=28 shell quenching
Authors: Ebata, Shuichiro Browse this author
Kimura, Masaaki Browse this author →KAKEN DB
Issue Date: 13-Jan-2015
Publisher: American Physical Society
Journal Title: Physical Review C
Volume: 91
Issue: 1
Start Page: 14309
Publisher DOI: 10.1103/PhysRevC.91.014309
Abstract: The quadrupole vibrational modes of neutron-rich N = 28 isotones (Ca-48, Ar-46, S-44, and Si-42) are investigated by using the canonical-basis time-dependent Hartree-Fock-Bogoliubov theory with several choice of energy density functionals, including nuclear pairing correlation. It is found that the quenching of the N = 28 shell gap and the proton holes in the sd shell trigger quadrupole correlation and increase the collectivity of the low-lying 2(+) state in Ar-46. It is also found that the pairing correlation plays an important role to increase the collectivity. We also demonstrate that the same mechanism to enhance the low-lying collectivity applies to other N = 28 isotones S-44 and Si-42, and it generates a couple of low-lying 2(+) states which can be associated with the observed 2(+) states.
Rights: ©2015 American Physical Society
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 木村 真明

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