$^{81}$ Zn的PDMATHAAB衰变中$^{81}$ Ga的快定时研究
Fast-timing study of $^{81}$Ga from the $β$ decay of $^{81}$Zn
摘要：
研究了$^{81}$ Zn到$N=50$魔核$^{81}$ Ga（相对于$^{78}$ Ni只有三价质子）的$β^{-}$衰变。这项研究是在CERN的ISOLDE设施通过$γ$光谱进行的。$^{81}$ Zn半衰期确定为$T_{1/2}=290(4)$ ms，而$β$ -延迟中子发射概率测量为$P_n=23(4)\%$。对来自$^{81}$ Zn衰变的$β$门控的$γ$射线单线态和$γ$-$γ$符合的分析提供了$^{81}$ Ga中的47个新能级和70个新跃迁.观察到了$^{81}$ Zn的$β^-$-$n$衰变，并建立了一个新的进入奇-奇$^{80}$ Ga核的衰变方案。采用LaBr $_3$（Ce）探测器，通过快速计时法测量了$^{81}$ Ga的第一和第二激发态的半衰期。的水平计划和过渡率相比，大规模的壳模型计算。$^{81}$ Ga的低位结构是用双幻$^{78}$ Ni核外三价质子的耦合来解释的。
英文摘要：
The $β^{-}$ decay of $^{81}$Zn to the neutron magic $N=50$ nucleus $^{81}$Ga, with only three valence protons with respect to $^{78}$Ni, was investigated. The study was performed at the ISOLDE facility at CERN by means of $γ$ spectroscopy. The $^{81}$Zn half-life was determined to be $T_{1/2}=290(4)$ ms while the $β$-delayed neutron emission probability was measured as $P_n=23(4)\%$. The analysis of the $β$-gated $γ$-ray singles and $γ$-$γ$ coincidences from the decay of $^{81}$Zn provides 47 new levels and 70 new transitions in $^{81}$Ga. The $β^-$$n$ decay of $^{81}$Zn was observed and a new decay scheme into the odd-odd $^{80}$Ga nucleus was established. The half-lives of the first and second excited states of $^{81}$Ga were measured via the fast-timing method using LaBr$_3$(Ce) detectors. The level scheme and transition rates are compared to large-scale shell-model calculations. The low-lying structure of $^{81}$Ga is interpreted in terms of the coupling of the three valence protons outside the doubly-magic $^{78}$Ni core.
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