Exploring Isospin Symmetry Breaking in Exotic Nuclei: High-Precision Mass Measurement of 23Si and Shell-Model Calculations of T = 5/2 Nuclei
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arXiv
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2025
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| author | Maier, F. M. Bollen, G. Brown, B. A. Campbell, S. E. Chen, X. Erington, H. Gamage, N. D. Ireland, C. M. Ringle, R. Schwarz, S. Sumithrarachchi, C. S. Villari, A. C. C. |
| author_facet | Maier, F. M. Bollen, G. Brown, B. A. Campbell, S. E. Chen, X. Erington, H. Gamage, N. D. Ireland, C. M. Ringle, R. Schwarz, S. Sumithrarachchi, C. S. Villari, A. C. C. |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_03034 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exploring Isospin Symmetry Breaking in Exotic Nuclei: High-Precision Mass Measurement of 23Si and Shell-Model Calculations of T = 5/2 Nuclei Maier, F. M. Bollen, G. Brown, B. A. Campbell, S. E. Chen, X. Erington, H. Gamage, N. D. Ireland, C. M. Ringle, R. Schwarz, S. Sumithrarachchi, C. S. Villari, A. C. C. Nuclear Experiment 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. |
| title | Exploring Isospin Symmetry Breaking in Exotic Nuclei: High-Precision Mass Measurement of 23Si and Shell-Model Calculations of T = 5/2 Nuclei |
| topic | Nuclear Experiment |
| url | https://arxiv.org/abs/2503.03034 |