Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB
Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB
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穿过 N=28 朝向中子滴线：首次测量 FRIB 半衰期
DOI：
10.1103/physrevlett.129.212501
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发表时间：
2022
影响因子：
8.6
通讯作者：
Bhattacharya, S.
中科院分区：
文献类型：
--
作者：
Crawford, H. L.;Tripathi, V.;Allmond, J. M.;Crider, B. P.;Grzywacz, R.;Liddick, S. N.;Andalib, A.;Argo, E.;Benetti, C.;Bhattacharya, S.
在稀有同位素束 (FRIB) 设施中，使用 FRIB 衰变站引发器测量了接近 f 附近中子滴线的外来同位素的新半衰期。第一个实验结果与最新的准粒子随机相位近似和壳模型计算进行了比较。总体而言，测量的半衰期与现有的理论描述一致，并表明在等音线下方有一个发育良好的变形区域。实验证实了硅中亚壳层封闭的侵蚀，并且与它的同位素邻居相比，观察到半衰期的缩短，这似乎不能根据衰变能和变形趋势得到很好的预测。这凸显了对这个非常奇特地区的额外数据和更先进的理论工作的需求。
New half-lives for exotic isotopes approaching the neutron drip-line in the vicinity offorwere measured at the Facility for Rare Isotope Beams (FRIB) with the FRIB decay station initiator. The first experimental results are compared to the latest quasiparticle random phase approximation and shell-model calculations. Overall, the measured half-lives are consistent with the available theoretical descriptions and suggest a well-developed region of deformation belowin theisotones. The erosion of thesubshell closure in Si is experimentally confirmed at, and a reduction in thehalf-life is observed as compared with its isotopic neighbors, which does not seem to be predicted well based on the decay energy and deformation trends. This highlights the need for both additional data in this very exotic region, and for more advanced theoretical efforts.