Masses of neutron-rich Sc 52-54 and Ti 54,56 nuclides: The N=32 subshell closure in scandium
Masses of neutron-rich Sc 52-54 and Ti 54,56 nuclides: The N=32 subshell closure in scandium
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富中子 Sc 52-54 和 Ti 54,56 核素的质量：钪中的 N=32 亚壳闭合
DOI：
10.1103/physrevc.99.064303
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发表时间：
2019
影响因子：
3.1
通讯作者：
Sun B.H.
中科院分区：
文献类型：
--
作者：
Xu X.;Wang M.;Blaum K.;Holt J.D.;Litvinov Yu.A.;Schwenk A.;Simonis J.;Stroberg S.R.;Zhang Y.H.;Xu H.S.;Shuai P.;Tu X.L.;Zhou X.H.;Xu F.R.;Audi G.;Chen R.J.;Chen X.C.;Fu C.Y.;Ge Z.;Huang W.J.;Litvinov S.;Liu D.W.;Lam Y.H.;Ma X.W.;Mao R.S.;Ozawa A.;Sun B.H.
等时质谱法已应用于存储环CSRe来测量富中子核的质量。新的质量过剩值 keV、keV 和 keV 与 2012 年原子质量评估值的偏差分别为 和 。这些大的偏差显着改变了钪同位素双中子分离能的系统学。从我们的新实验结果中提取的经验壳间隙显示，钪有显着的亚壳闭合，其大小与钙相似。此外，我们基于手性有效场理论的两核子和三核子相互作用，使用介质中相似性重整化群的价空间进行了初始计算。理论结果证实了 Sc 和 Ca 中存在大量的壳层间隙，并且具有向较轻的同位素减少的趋势，从而提供了从壳层到幻数演化的一致图景。
Isochronous mass spectrometry has been applied in the storage ring CSRe to measure the masses of the neutron-richandnuclei. The new mass excess valueskeV,keV, andkeV, deviate from the Atomic Mass Evaluation 2012 by, and, respectively. These large deviations significantly change the systematics of the two-neutron separation energies of scandium isotopes. The empirical shell gap extracted from our new experimental results shows a significant subshell closure atin scandium, with a similar magnitude as in calcium. Moreover, we presentab initiocalculations using the valence-space in-medium similarity renormalization group based on two- and three-nucleon interactions from chiral effective field theory. The theoretical results confirm the existence of a substantialshell gap in Sc and Ca with a decreasing trend towards lighter isotones, thus providing a consistent picture of the evolution of themagic number from theinto theshell.