Alpha decay properties of the semi-magic nucleus 219Np
Alpha decay properties of the semi-magic nucleus 219Np
复制标题
半魔核219Np的α衰变特性
DOI：
10.1016/j.physletb.2017.12.017
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发表时间：
2017
影响因子：
4.4
通讯作者：
Xiao G. Q.
中科院分区：
文献类型：
--
作者：
Yang H. B.;Ma L.;Zhang Z. Y.;Yang C. L.;Gan Z. G.;Zhang M. M.;Huang M. H.;Yu L.;Jiang J.;Tian Y. L.;Wang Y. S.;Wang J. G.;Liu Z.;Liu M. L.;Duan L. M.;Zhou S. G.;Ren Z. Z.;Zhou X. H.;Xu H. S.;Xiao G. Q.
在重原子与核结构谱仪（SHANS）上进行了187re (36ar, 4n) 219 Np的聚变反应，产生了半幻核219 Np。数据采集采用基于波形数字化仪的快速电子系统，对采样脉冲进行数字化处理。利用植入物与随后α衰变之间的空间和时间相关性来鉴定反应产物。根据α-衰变链，219 Np的能量为E α= 9039 (40) keV，半衰期为t1 /2= 0.15−0.07+ 0.72 ms。推导出的219 Np的质子结合能很好地符合系统论，这再次证明了在Z= 92处不存在亚壳层闭合。在α-衰变还原宽度的框架内讨论了N= 126壳闭合对Np同位素稳定性的影响。
The semi-magic nucleus 219 Np was produced in the fusion reaction 187 Re (36 Ar, 4n) 219 Np at the gas-filled recoil separator SHANS (Spectrometer for Heavy Atoms and Nuclear Structure). A fast electronics system based on waveform digitizers was used in the data acquisition and the sampled pulses were processed by digital algorithms. The reaction products were identified using spatial and time correlations between the implants and subsequent α decays. According to the observed α-decay chain, an energy of E α= 9039 (40) keV and a half-life of T 1/2= 0.15− 0.07+ 0.72 ms were determined for 219 Np. The deduced proton binding energy of 219 Np fits well into the systematics, which gives another evidence of that there is no sub-shell closure at Z= 92. The influence of the N= 126 shell closure on the stability of Np isotopes is discussed within the framework of α-decay reduced widths.