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arXiv · 2503.03034

Exploring Isospin Symmetry Breaking in Exotic Nuclei: High-Precision Mass Measurement of 23Si and Shell-Model Calculations of T = 5/2 Nuclei

F. M. Maier·G. Bollen·B. A. Brown·S. E. Campbell·X. Chen·H. Erington·N. D. Gamage·C. M. Ireland·R. Ringle·S. Schwarz·C. S. Sumithrarachchi·A. C. C. Villari
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Abstract

We present a high-precision mass measurement of the proton-rich nucleus 23Si, performed with the LEBIT Penning trap at the Facility for Rare Isotope Beams (FRIB) utilizing the time-of-flight ion cyclotron resonance (TOF-ICR) technique. We determined a mass excess of 23362.9(5.8) keV, which agrees with a recent storage-ring measurement from CSRe but has a factor 20 improved precision. 23Si is hence the nucleus with the most precisely known mass of all nuclei with an isospin projection of Tz =-5/2. We performed shell-model calculations with the USDC and USDCm Hamiltonians to study binding energy differences and Thomas-Ehrmann shifts in mirror systems with an isospin up to T = 5/2. Our experimental result and other recently reported masses of neutron-deficient sd-shell nuclei agree well with the theoretical predictions, demonstrating that isospin symmetry breaking in sd-shell nuclei, even at high isospin values, is well described by modern shell-model calculations.

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F. M. Maier, G. Bollen, B. A. Brown, S. E. Campbell, X. Chen, H. Erington, N. D. Gamage, C. M. Ireland, R. Ringle, S. Schwarz, C. S. Sumithrarachchi, A. C. C. Villari. 2025-03-04. Exploring Isospin Symmetry Breaking in Exotic Nuclei: High-Precision Mass Measurement of 23Si and Shell-Model Calculations of T = 5/2 Nuclei. https://doi.org/10.1103/14s5-17gj

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