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Level structure; shell model; core excitation

Shell-model calculations are performed using NuShellX code in the model space $\pi( f_{5/2}, p_{3/2}, p_{1/2}, g_{9/2}) \otimes \nu(g_{9/2}, g_{7/2}, d_{5/2}, h_{11/2})$, which probe the proton core excitation from the interior of $Z = 38$ semiclosed shell and neutron core excitation from the interior of $N = 56$ semiclosed shell for the level structure of $^{89}Sr$. Our calculations show that the excitation of a single $d_{5/2}$ neutron across $N = 56$ semiclosed shell into the $h_{11/2}$ orbit should have great effects on the excited states of $^{89}Sr$. In addition, the systematic features of proton core excitation across $Z = 38$ semiclosed shell into the $g_{9/2}$ orbit and neutron core excitation across $N = 56$ semiclosed shell into the $g_{7/2}, s_{1/2}, d_{3/2}, h_{11/2}$ orbits in $N = 51$ isotones are discussed.

YI HENG WU¹ KE YAN MA² FEI CHENG¹ XUE YUAN CAI¹

1. School of Physics and Electronic Engineering, An Qing Normal University, Anqing, China
2. College of Physics, Jilin University, Changchun, China

Published

12 March 2020

Manuscript received

13 March 2019

Manuscript revised

1 July 2019

Accepted

11 December 2019

Early published

Unedited version published online

Final version published online

12 March 2020