αdecay of the new isotope 204Ac
αdecay of the new isotope 204Ac
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新同位素 204Ac 的 α 衰变
DOI：
10.1016/j.physletb.2022.137484
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发表时间：
2022
影响因子：
4.4
通讯作者：
J.G.Wang
中科院分区：
文献类型：
--
作者：
M.H.huang;Z.G.Gan;Z.Y.Zhang;L.Ma;J.G.Wang
在充气反冲分离器SHANS 2和SHANS 2上，用反冲α关联法对Tm（40 169 Ca，5 n）204 Ac的聚变蒸发反应中产生的一种新的未结合质子的同位素204 Ac进行了鉴定。测量了产生204 Ac的激发函数，并估算出最佳束流能量为212 MeV。观察到19条ER-α 1-α 2-α 3衰变链。根据这些链，204 Ac的α粒子能量和半衰期分别被确定为7948（15）keV和7.4− 1.4+ 2.2 ms。两者都符合理论预测。约化的α衰变宽度被推断为49− 15+ 10 keV，这表明204 Ac的α衰变是有利的。此外，对于205 Ac，获得了更精确的衰变性质，E α= 7883（15）keV，T1/2= 7.7− 1.6+ 2.7 ms。
A new proton-unbound isotope 204 Ac was produced in the fusion-evaporation reaction Tm (40 169 Ca, 5n) 204 Ac and identified via the recoil-α correlation at the gas-filled recoiled separators SHANS2 and SHANS. The excitation function for producing 204 Ac was measured and the optimal beam energy was evaluated to be 212 MeV. Nineteen ER-α 1-α 2-α 3 decay chains were observed for this isotope. Based on these chains, the α-particle energy and half-life of 204 Ac were determined to be 7948 (15) keV and 7.4− 1.4+ 2.2 ms, respectively. Both are consistent with the theoretical prediction. The reduced α-decay width was deduced to be 49− 15+ 10 keV, which indicates a favored α decay for 204 Ac. In addition, more precise decay properties of E α= 7883 (15) keV and T 1/2= 7.7− 1.6+ 2.7 ms were obtained for 205 Ac.