The recent experimental observation of isospin symmetry breaking (ISB) in the ground states of the T = 3/2 mirror pair Sr-73-Br-73 is theoretically studied using large-scale shell-model calculations. The large valence space and the successful PFSDG-U effective interaction used for the nuclear part of the problem capture possible structural changes and provide a robust basis to treat the ISB effects of both electromagnetic and nonelectromagnetic origin. The calculated shifts and mirror-energy differences are consistent with the inversion of the I-pi = 1/2(-), 5/2(-) states between Sr-73 and Br-73 and suggest that the role played by the Coulomb interaction is dominant. An isospin breaking contribution of nuclear origin is estimated to be approximate to 25 keV.
Isospin symmetry breaking in the mirror pair Sr-73-Br-73
Lenzi, SM;
2020
Abstract
The recent experimental observation of isospin symmetry breaking (ISB) in the ground states of the T = 3/2 mirror pair Sr-73-Br-73 is theoretically studied using large-scale shell-model calculations. The large valence space and the successful PFSDG-U effective interaction used for the nuclear part of the problem capture possible structural changes and provide a robust basis to treat the ISB effects of both electromagnetic and nonelectromagnetic origin. The calculated shifts and mirror-energy differences are consistent with the inversion of the I-pi = 1/2(-), 5/2(-) states between Sr-73 and Br-73 and suggest that the role played by the Coulomb interaction is dominant. An isospin breaking contribution of nuclear origin is estimated to be approximate to 25 keV.
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73Sr-Br-PhysRevC.102.031302.pdf
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