Abstract

Double beta decay (β⁺EC, EC/EC) of ⁷⁴Se was investigated at the Modane underground laboratory (LSM, France; 4800 m of water equivalent) using the OBELIX ultralow-background HPGe detector with a sensitive volume of 600 cm³ and a sample of natural selenium with a mass of 1.6 kg containing ~0.89% (~14.24 g) of ⁷⁴Se. The new experimental limits for β⁺EC and EC/EC decays of ⁷⁴Se to ground 0⁺ and excited \(2_{1}^{ + },\) 596 keV, and \(2_{2}^{ + },\) 1204 keV states of ⁷⁴Ge, were obtained from experimental data accumulated over 135 days.

中文翻译：

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寻找74 Se的β+ EC和EC / EC衰变

摘要

双β衰变（β ⁺ EC，EC / EC）的⁷⁴硒在所述Modane地下实验室研究;使用所述的Obelix超低背景HPGe探测器具有600厘米的敏感体积（LSM，法国当量水4800米）³和重量为1.6千克的天然硒样品，含〜0.89％（〜14.24 g）的⁷⁴ Se。β ⁺ EC和EC / EC衰减⁷⁴ Se到地面0 ⁺并激发\（2_ {1} ^ {+}，\） 596 keV和\（2_ {2} ^ {+}的新实验极限， \）的1204千点电子伏的状态⁷⁴的Ge，从累积135天实验数据获得的。