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$^{190}$ Pt和$^{198}$ Pt双β衰变的新极限

New limits on double-beta decay of $^{190}$Pt and $^{198}$Pt

F. A. Danevich, M. Hult, A. Junghans, D. V. Kasperovych, B. N. Kropivyansky, G. Lutter, G. Marissens, O. G. Polischuk, M. V. Romaniuk, H. Stroh, S. Tessalina, V… 展开作者

F. A. Danevich, M. Hult, A. Junghans, D. V. Kasperovych, B. N. Kropivyansky, G. Lutter, G. Marissens, O. G. Polischuk, M. V. Romaniuk, H. Stroh, S. Tessalina, V. I. Tretyak, B. Ware

备注：
23 pages, 11 figures, 4 tables
发表信息：
Eur. Phys. J. C (2022) 82:29
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摘要：

在HADES地下实验室，利用两个超低本底HPGe探测器测量了148 g铂样品8946 h以上，实现了对发射$γ$射线量子的$^{190}$ Pt和$^{198}$ Pt的双β衰变的研究。用电感耦合等离子体质谱法对铂样品的同位素组成进行了高精度测定。$^{190}$ Pt相对于不同衰变通道和模式的半衰期的新下限设定为$\lim T_{1/2}\sim 10^{14}-10^{16}$年。一个可能的精确的共振$0νKN$过渡到1，2 1326.9千电子伏的$^{190}$-O的水平是有限的第一次作为$T_{1/2} \geq 2.5 \times10^{16}$年。将$^{198}$ Pt到$^{198}$ Hg第一激发能级的双β衰变的新下限设定为$T_{1/2} \geq 3.2\times10^{19}$ yr，比先前实验中获得的极限高一个数量级。

英文摘要：

A search for double-beta decay of $^{190}$Pt and $^{198}$Pt with emission of $γ$-ray quanta was realized at the HADES underground laboratory with a 148 g platinum sample measured by two ultralow-background HPGe detectors over 8946 h. The isotopic composition of the platinum sample has been measured with high precision using inductively coupled plasma mass spectrometry. New lower limits for the half-lives of $^{190}$Pt relative to different channels and modes of the decays were set on the level of $\lim T_{1/2}\sim 10^{14}-10^{16}$ yr. A possible exact resonant $0νKN$ transition to the 1,2 1326.9 keV level of $^{190}$Os is limited for the first time as $T_{1/2} \geq 2.5 \times10^{16}$ yr. A new lower limit on the double-beta decay of $^{198}$Pt to the first excited level of $^{198}$Hg was set as $T_{1/2} \geq 3.2\times10^{19}$ yr, one order of magnitude higher than the limit obtained in the previous experiment.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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