论文标题
$β$ decay $^{81} $ Zn的$^{81} $ ga的快速研究
Fast-timing study of $^{81}$Ga from the $β$ decay of $^{81}$Zn
论文作者
论文摘要
$β^{ - } $衰减的$^{81} $ Zn to neutron Magic $ n = 50 $ nucleus $^{81} $ ga，仅针对$^{78} $ ni，只有三个价值质子。该研究是通过$γ$光谱在CERN的Isolde设施进行的。 $^{81} $ zn半寿命被确定为$ t_ {1/2} = 290（4）$ ms，而$β$ - 删除的中子排放概率被测量为$ p_n = 23（4）\％$。从$^{81} $ Zn的衰减中对$β$ - 键入的$γ$ -Ray单打和$γ$ - $γ$的巧合的分析提供了47个新的水平和70个新的过渡，以$^{81} $ ga提供。观察到了$β^ - $$ n $ n $衰减的$^{81} $ Zn，并建立了奇数$^{80} $ ga nucleus的新衰减方案。 $^{81} $ ga的第一和第二激发状态的半衰期是通过使用labr $ _3 $（CE）检测器的快速定时方法测量的。将水平方案和过渡速率与大规模的壳模计算进行比较。 $^{81} $ ga的低洼结构是根据双质质子$^{78} $ ni Core的三个价质子的耦合来解释的。
The $β^{-}$ decay of $^{81}$Zn to the neutron magic $N=50$ nucleus $^{81}$Ga, with only three valence protons with respect to $^{78}$Ni, was investigated. The study was performed at the ISOLDE facility at CERN by means of $γ$ spectroscopy. The $^{81}$Zn half-life was determined to be $T_{1/2}=290(4)$ ms while the $β$-delayed neutron emission probability was measured as $P_n=23(4)\%$. The analysis of the $β$-gated $γ$-ray singles and $γ$-$γ$ coincidences from the decay of $^{81}$Zn provides 47 new levels and 70 new transitions in $^{81}$Ga. The $β^-$$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.
