首次用超低本底HP Ge γ谱研究铂的双β衰变
First search for double beta decay of platinum by ultra-low background HP Ge gamma spectrometry
摘要：
在INFN（意大利）的地下格兰萨索国家实验室中，借助超低本底HP Ge 468 cm ^3 γ谱仪，实现了对190 Pt和198 Pt中双β过程的研究。用42.5g铂样品进行了1815 h的数据采集，建立了190 Pt中2 β过程（εβ^+和2ε）的T_{1/2}极限为10^{14}-10 ^<$16}年，比以前已知的极限高3 ~ 4个数量级。特别地，在90% C. L下，190 Pt中可能的共振双电子捕获被限制在2.9 \times 10^{16} yr的水平上。此外，还首次提出了198 Pt（2ν+0ν）2 β ^-衰变到198 Hg 2^+_1激发能级的T_{1/2}极限：T_{1/2} >3.5 \times 10^{18}年。报告所用铂样品的放射性纯度水平。
英文摘要：
A search for double beta processes in 190Pt and 198Pt was realized with the help of ultra-low background HP Ge 468 cm^3 gamma spectrometer in the underground Gran Sasso National Laboratories of the INFN (Italy). After 1815 h of data taking with 42.5 g platinum sample, T_{1/2} limits on 2beta processes in 190Pt (εβ^+ and 2ε) have been established on the level of 10^{14}-10^{16} yr, 3 to 4 orders of magnitude higher than those known previously. In particular, a possible resonant double electron capture in 190Pt was restricted on the level of 2.9 \times 10^{16} yr at 90% C.L. In addition, T_{1/2} limit on 2 beta^- decay of 198Pt (2ν+0ν) to the 2^+_1 excited level of 198Hg has been set at the first time: T_{1/2}>3.5 \times 10^{18} yr. The radiopurity level of the used platinum sample is reported.
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