open access

https://hdl.handle.net/2115/58432

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

英語

2015-01-13

American Physical Society

Physical Review C

91(1)

14309

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.

学術雑誌論文

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©2015 American Physical Society

0556-2813

1089-490X