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$^{50}$ V衰变模式半衰期的新研究

A new investigation of half-lives for the decay modes of $^{50}$V

M. Laubenstein, B. Lehnert, S. S. Nagorny, S. Nisi, K. Zuber

发表信息：
Phys. Rev. C 99, 045501 (2019)
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摘要：

在Gran Sasso地下实验室（LNGS）对$^{50}$ V的4重禁戒非唯一衰变模式进行了新的研究。总共累积了197 kg $\times$ d的暴露量。迄今为止，以最高精度测量了电子捕获到$^{50}$ Ti第一激发态的半衰期，为$2.67_{-0.18}^{+0.16} \times 10^{17}$年（68% C.I.）其中系统学不确定性占主导地位。对$β$ -衰变到$^{50}$ Cr的第一激发态的研究得到了下限${1.9} \times 10^{19}$ yr（90% C.I.），这与现有结果相比是几乎一个数量级的改进。新测量的灵敏度现在处于理论预测的范围内。

英文摘要：

A new search for the decay modes of the 4-fold forbidden non-unique decay of $^{50}$V has been performed at the Gran Sasso Underground Laboratory (LNGS). In total an exposure of 197 kg $\times$ d has been accumulated. The half-life for the electron capture into the first excited state of $^{50}$Ti has been measured with the highest precision to date as $2.67_{-0.18}^{+0.16} \times 10^{17}$ yr (68% C.I.) in which systematics uncertainties dominate. The search for the $β$-decay into the first excited state of $^{50}$Cr resulted in a lower limit of ${1.9} \times 10^{19}$ yr (90% C.I.), which is an improvement of almost one order of magnitude compared to existing results. The sensitivity of the new measurement is now in the region of theoretical predictions.

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