Influence of the unique-parity states on the collectivity of low-lying states

Yan An Luo, Nankai University
Jin Quan Chen, Nanjing University
Ya Chen Gao, Liaoning Normal University
Ping Zhi Ning, Nankai University
J. P. Draayer, Louisiana State University


The importance of the unique-parity single-particle level in the description of nuclear collectivity is stressed in the framework of the nucleon-pair shell model truncated to the SD subspace. It is found that with the shell model Hamiltonian which includes the single-particle energy term, the unique-parity single-particle level has to be included to describe the low-lying collective states reasonably.