Fine structure in the α decay of 223U
Fine structure in the α decay of 223U
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223U α 衰变中的精细结构
DOI：
10.1016/j.physletb.2019.135096
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Zhou X
中科院分区：
文献类型：
--
作者：
Sun M.D.;Liu Z.;Huang T.H.;Zhang W.Q.;Andreyev A.N.;Ding B.;Wang J.G.;Liu X.Y.;Lu H.Y.;Hou D.S.;Gan Z.G.;Ma L.;Yang H.B.;Zhang Z.Y.;Yu L.;Jiang J.;Wang K.L.;Wang Y.S.;Liu M.L.;Li Z.H.;Li J.;Wang X.;Feng A.H.;Lin C.J.;Sun L.J.;Ma N.R.;Zuo W.;Xu H.S.;Zhou X
利用快速数字脉冲处理技术，在187Re（40Ar，p3n）聚变蒸发反应中观察到了223U α衰变的精细结构。通过建立223U → α 1219Th → α 2215Ra → α 3211Rn的衰变链，确定了223U的两个α衰变分支：基态和219Th的244keV激发态。223 U基态到基态跃迁的α粒子能量被确定为8993（17）keV，比之前的值高出213 keV，半衰期更新为62− 10+ 14 μs。在核质量和约化α衰变宽度的框架下讨论了N= 131偶Z同位素从Po到U的核结构演化，提出了223 U基态相对于其轻同位素219 Ra和221 Th的八极形变减弱的观点。
Fine structure in the α decay of 223 U was observed in the fusion-evaporation reaction 187 Re (40 Ar, p3n) by using fast digital pulse processing technique. Two α-decay branches of 223 U feeding the ground state and 244 keV excited state of 219 Th were identified by establishing the decay chain 223 U→ α 1 219 Th→ α 2 215 Ra→ α 3 211 Rn. The α-particle energy for the ground-state to ground-state transition of 223 U was determined to be 8993 (17) keV, 213 keV higher than the previous value, the half-life was updated to be 62− 10+ 14 μs. Evolution of nuclear structure for N= 131 even-Z isotones from Po to U was discussed in the frameworks of nuclear mass and reduced α-decay width, a weakening octupole deformation in the ground state of 223 U relative to its lighter isotones 219 Ra and 221 Th was suggested.