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16 March 2025

» arxiv » 2201.00330

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Isospin Mixing and the Cubic Isobaric Multiplet Mass Equation in the Lowest T = 2, A = 32 Quintet
M. Kamil ; S. Triambak ; A. Magilligan ; A. García ; B. A. Brown ; P. Adsley ; V. Bildstein ; C. Burbadge ; A. Diaz Varela ; T. Faestermann ; P. E. Garrett ; R. Hertenberger ; N. Y. Kheswa ; K. G. Leach ; R. Lindsay ; D. J. Marín-Lámbarri ; F. Ghazi Moradi ; N. J. Mukwevho ; R. Neveling ; J. C. Nzobadila Ondze ; P. Papka ; L. Pellegri ; V. Pesudo ; B. M. Rebeiro ; M. Scheck ; F. D. Smit ; H.-F. Wirth ;
Date:	2 Jan 2022
Abstract:	The isobaric multiplet mass equation (IMME) is known to break down in the first T = 2, A = 32 isospin quintet. In this work we combine high-resolution experimental data with state-of-the-art shell-model calculations to investigate isospin mixing as a possible cause for this violation. The experimental data are used to validate isospin-mixing matrix elements calculated with newly developed shell-model Hamiltonians. Our analysis shows that isospin mixing with nonanalog T = 1 states contributes to the IMME breakdown, making the requirement of an anomalous cubic term inevitable for the multiplet.
Source:	arXiv, 2201.00330
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