High-precision Penning trap mass measurements of neutron-rich chlorine isotopes at the N=28 shell closure
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arXiv
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2025
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| author | Erington, H. Bollen, G. Dykstra, G. Hamaker, A. Ireland, C. M. Nicoloff, C. R. Puentes, D. Ringle, R. Schwarz, S. Sumithrarachchi, C. S. Valverde, A. A. Yandow, I. T. |
| author_facet | Erington, H. Bollen, G. Dykstra, G. Hamaker, A. Ireland, C. M. Nicoloff, C. R. Puentes, D. Ringle, R. Schwarz, S. Sumithrarachchi, C. S. Valverde, A. A. Yandow, I. T. |
| contents | Although it is known that the $N=28$ spherical shell closure erodes, the strength of the closure with decreasing proton number $Z<20$ is an open question in nuclear structure. In this region of interest, direct high-precision mass measurements of neutron-rich $^{43-45}$Cl isotopes were performed at the Low Energy Beam and Ion Trap (LEBIT) when coupled to the National Superconducting Cyclotron Lab. The resulting mass excesses (MEs) are ME($^{43}$Cl) = -24114.4(1.7) keV, ME($^{44}$Cl) = -20450.8(10.6) keV, and ME($^{45}$Cl) = -18240.1(3.7) keV, and improve the uncertainty of these masses by up to a factor of ~40 compared to the previous values reported in the 2020 Atomic Mass Evaluation. Comparison to $\textit{ab initio}$ calculations using the Valence-Space In-Medium Similarity Renormalization Group (VS-IMSRG) shows good agreement up to and including the closure. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_18354 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-precision Penning trap mass measurements of neutron-rich chlorine isotopes at the N=28 shell closure Erington, H. Bollen, G. Dykstra, G. Hamaker, A. Ireland, C. M. Nicoloff, C. R. Puentes, D. Ringle, R. Schwarz, S. Sumithrarachchi, C. S. Valverde, A. A. Yandow, I. T. Nuclear Experiment Nuclear Theory Although it is known that the $N=28$ spherical shell closure erodes, the strength of the closure with decreasing proton number $Z<20$ is an open question in nuclear structure. In this region of interest, direct high-precision mass measurements of neutron-rich $^{43-45}$Cl isotopes were performed at the Low Energy Beam and Ion Trap (LEBIT) when coupled to the National Superconducting Cyclotron Lab. The resulting mass excesses (MEs) are ME($^{43}$Cl) = -24114.4(1.7) keV, ME($^{44}$Cl) = -20450.8(10.6) keV, and ME($^{45}$Cl) = -18240.1(3.7) keV, and improve the uncertainty of these masses by up to a factor of ~40 compared to the previous values reported in the 2020 Atomic Mass Evaluation. Comparison to $\textit{ab initio}$ calculations using the Valence-Space In-Medium Similarity Renormalization Group (VS-IMSRG) shows good agreement up to and including the closure. |
| title | High-precision Penning trap mass measurements of neutron-rich chlorine isotopes at the N=28 shell closure |
| topic | Nuclear Experiment Nuclear Theory |
| url | https://arxiv.org/abs/2505.18354 |