Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes

Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes
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N=40 反演岛的顶峰:富中子铬同位素的精密质量测量和从头算

DOI:
10.1016/j.physletb.2022.137288
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发表时间:
2022
期刊:
影响因子:
4.4
通讯作者:
Silwal R
Silwal R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Silwal R

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质量测量继续为阐明原子核结构和天体物理学意义上的情况提供宝贵的信息。Z= 20和28质子壳层闭合之间的过渡区特别有趣,这是由于随着原子核变得更加富含中子,核变形的发生和演变。这为新兴的从头算核结构模型提供了一个关键的测试平台。在这里,我们提出了高精度的质量测量的富中子铬同位素使用敏感的静电多重反射飞行时间质谱仪(MR-TOF-MS)在TRIUMF的离子阱原子和核科学(TITAN)设施。我们对59,61− 63 Cr的高精度质量测量证实了先前的结果,而64− 65 Cr测量精度的提高使质量表面的精度超过了N= 40。与从头算在介质中的相似重整化群,我们研究的铬同位素集体的趋势,并给出了一个完整的图片N= 40岛的反转从钙到镍。
Mass measurements continue to provide invaluable information for elucidating nuclear structure and scenarios of astrophysical interest. The transition region between the Z= 20 and 28 proton shell closures is particularly interesting due to the onset and evolution of nuclear deformation as nuclei become more neutron-rich. This provides a critical testing ground for emerging ab-initio nuclear structure models. Here, we present high-precision mass measurements of neutron-rich chromium isotopes using the sensitive electrostatic Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) at TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility. Our high-precision mass measurements of 59, 61− 63 Cr confirm previous results, and the improved precision in measurements of 64− 65 Cr refine the mass surface beyond N= 40. With the ab initio in-medium similarity renormalization group, we examine the trends in collectivity in chromium isotopes and give a complete picture of the N= 40 island of inversion from calcium to nickel.
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