New experimental limits on double-beta decay of osmium. (24th June 2021)

• Record Type: Journal Article
• Authors: Belli, P; Bernabei, R; Cappella, F; Caracciolo, V; Cerulli, R; Danevich, F A; Incicchitti, A; Kasperovych, D V; Kobychev, V V; Kovtun, G P; Kovtun, N G; Laubenstein, M; Merlo, V; Poda, D V; Polischuk, O G; Shcherban, A P; Tessalina, S; Tretyak, V I
• Is Part Of: Journal of physics. Volume 48:Number 8(2021)
• Publication Date: 2021-06-24
• Subjects: 184Os -- 192Os -- double-beta decay -- low-background gamma spectrometry; Nuclear physics -- Periodicals; Particles (Nuclear physics) -- Periodicals; Physique nucléaire -- Périodiques; Particules (Physique nucléaire) -- Périodiques; Kernfysica; Elementaire deeltjes; 539.7
• DOI: 10.1088/1361-6471/ac068a
• Languages: English
• ISSNs: 0954-3899

Abstract

Abstract: Double-beta processes in 184 Os and 192 Os were searched for over 15 851 h at the Gran Sasso National Laboratory (LNGS) of the I.N.F.N. by using a 118 g ultra-pure osmium sample installed on the endcap of a 112 cm 3 ultra-low-background broad-energy germanium detector. New limits on double-electron capture and electron capture with positron emission in 184 Os were set at the level of lim T 1/2 ∼ 10 16 –10 17 years. In particular the 2 ν 2 K and 2 ν KL decays of 184 Os to the ground state of 184 W are restricted as T 1/2 ⩾ 3.0 × 10 16 years and T 1/2 ⩾ 2.0 × 10 16 years, respectively. A lower limit on the half-life for the double-beta decay of 192 Os to the first excited level of 192 Pt was set as lim T 1/2 = 2.0 × 10 20 years at 90% confidence level