Effective proton-neutron interaction in mirror nuclei

2025/03/03 by Y. M. Xing, Xing, Y. M., Ying-she Luo +21
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #Nuclear physics research studies #Quantum, superfluid, helium dynamics

paper · pdf · doi:10.48550/arxiv.2503.01398

openalex publication_date 2025/03/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Effective proton-neutron interactions, V_pn, in mirror nuclei are systematically analyzed using the ground-state atomic masses. A mirror symmetry of V_pn is found for bound nuclei with a standard deviation of σ=32 keV. However, this mirror symmetry is apparently broken for some mirror-nuclei pairs when a proton-unbound nucleus is involved in extracting the V_pn values. Such a mirror-symmetry breaking is attributed to the Thomas-Ehrman shift of the proton-unbound nucleus and investigated by using the Gamow shell model. It is concluded that the Thomas-Ehrman shift originates mainly from reduced Coulomb energies in the proton-unbound nuclei due to the extended radial density distribution of valence protons.

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