短寿命α发射同位素²²²Np与N = 126幻核壳层的稳定性
Short-Lived α-Emitting Isotope ^{222}Np and the Stability of the N=126 Magic Shell.
作者信息
Ma L, Zhang Z Y, Gan Z G, Zhou X H, Yang H B, Huang M H, Yang C L, Zhang M M, Tian Y L, Wang Y S, Zhou H B, He X T, Mao Y C, Hua W, Duan L M, Huang W X, Liu Z, Xu X X, Ren Z Z, Zhou S G, Xu H S
机构信息
CAS Key Laboratory of High Precision Nuclear Spectroscopy, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
出版信息
Phys Rev Lett. 2020 Jul 17;125(3):032502. doi: 10.1103/PhysRevLett.125.032502.
A new, very short-lived neutron-deficient isotope ^{222}Np was produced in the complete-fusion reaction ^{187}Re(^{40}Ar,5n)^{222}Np, and observed at the gas-filled recoil separator SHANS. The new isotope ^{222}Np was identified by employing a recoil-α correlation measurement, and six α-decay chains were established for it. The decay properties of ^{222}Np with E_{α}=10016(33) keV and T_{1/2}=380_{-110}^{+260} ns were determined experimentally. The α-decay systematics of Np isotopes is improved by adding the new data for ^{222}Np, which validates the N=126 shell effect in Np isotopes. The evolution of the N=126 shell closure is discussed in the neutron-deficient nuclei up to Np within the framework of α-decay reduced width.
通过全熔合反应(^{187}Re(^{40}Ar,5n)^{222}Np)产生了一种新的、寿命极短的缺中子同位素(^{222}Np)，并在充气反冲分离器SHANS上进行了观测。通过采用反冲-α关联测量鉴定了新同位素(^{222}Np)，并为其建立了六条α衰变链。通过实验确定了(^{222}Np)的衰变特性，其α粒子能量(E_{α}=10016(33))keV，半衰期(T_{1/2}=380_{-110}^{+260})ns。通过添加(^{222}Np)的新数据改进了Np同位素的α衰变系统学，这证实了Np同位素中的(N = 126)壳层效应。在α衰变约化宽度的框架内，讨论了缺中子核中直至Np的(N = 126)壳层闭壳的演化。
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