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arXiv 1402.7196nucl-ex
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$^{100}$ Mo到$^{100}$ Ru激发态的双β衰变研究

Investigation of double beta decay of $^{100}$Mo to excited states of $^{100}$Ru

R. Arnold, C. Augier, A. S. Barabash

摘要:

使用600 cm $^{100}$低本底HPGe探测器和由2588 g 97.5%富集的金属$^{100}$ Mo组成的外部源研究了$^{100}$ Mo到子核激发态的双β衰变,该外部源以前在NEMO-3探测器内并用于$^{100}$ Mo的NEMO-3测量。测得$^{100}$ Mo到$^{100}$ Ru的0 $^+_1$激发态的双中微子双β衰变的半衰期为$T_{1/2}=[7.5 \pm{0.6}(stat) \pm {0.6}(syst)]\cdot 10^{20}$ yr。对于$^{100}$ Ru中其他$(0ν+ 2ν)$转换为2 $^+_1$、2 $^+_2$、0 PDMATHAMR、2 $^+_3$和0 $^+_3$水平,限值在$\sim (0.25-1.1)\cdot 10^{22}$ yr水平获得。

英文摘要:

Double beta decay of $^{100}$Mo to the excited states of daughter nuclei has been studied using a 600 cm$^3$ low-background HPGe detector and an external source consisting of 2588 g of 97.5% enriched metallic $^{100}$Mo, which was formerly inside the NEMO-3 detector and used for the NEMO-3 measurements of $^{100}$Mo. The half-life for the two-neutrino double beta decay of $^{100}$Mo to the excited 0$^+_1$ state in $^{100}$Ru is measured to be $T_{1/2}=[7.5 \pm{0.6}(stat) \pm {0.6}(syst)]\cdot 10^{20}$ yr. For other $(0ν+ 2ν)$ transitions to the 2$^+_1$, 2$^+_2$, 0$^+_2$, 2$^+_3$ and 0$^+_3$ levels in $^{100}$Ru, limits are obtained at the level of $\sim (0.25-1.1)\cdot 10^{22}$ yr.

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