New observation of 2β2ν decay of ¹⁰⁰Mo to the level of ¹⁰⁰Ru in the ARMONIA experiment

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• 作者：P. Belli ; R. Bernabei ; R.S. Boiko ; F. Cappella ; R. Cerulli ; F.A. Danevich ; S. d'Angelo ; A. Incicchitti ; V.V. Kobychev ; B.N. Kropivyansky ; M. Laubenstein ; P.G. Nagornyi ; S.S. Nagorny ; S. Nisi ; F. Nozzo
• 关键词：Radioactivity ; ¹⁰⁰Mo(2β ; ⁻ ; ) ; measured ; ; none ; color ; black"" href=""/science?_ob=MathURL&_method=retrieve&_udi=B6TVB-50F8BRN-1&_mathId=mml10&_use
• 刊名：Nuclear Physics A
• 出版年：2010
• 出版时间：30 November 2010
• 年：2010
• 卷：846
• 期：1-4
• 页码：143-156
• 全文大小：444 K

文摘

A sample of ¹⁰⁰MoO₃ powder with molybdenum enriched in ¹⁰⁰Mo to 99.5 % and mass of 1199 g was measured for 18120 h in a low-background set-up with 4 HP Ge detectors (225 cm³ volume each one) deep underground (3600 m w.e.) at the Laboratori Nazionali del Gran Sasso of the INFN (Italy). The two γ quanta of 540 keV and of 591 keV emitted in the deexcitation process after a 2β2ν decay of ¹⁰⁰Mo to the excited level of ¹⁰⁰Ru (E_exc=1131 keV) are observed in the accumulated data both in coincidence and in the 1-dimensional sum spectrum. The measured half life is: , well in agreement with positive results obtained in previous experiments. Moreover, the limit on charge non-conserving β decay of ¹⁰⁰Mo is also set: τ_CNC>4.5×10¹⁹ yr at 90 % C.L.; it corresponds to the limit on CNC admixture in weak currents: .