2020/01/17 by 3 collaboration, R. Arnold, C. Augier +122
Chemistry · Mathematics · Physics and Astronomy · #Algorithm #Analytical Chemistry (journal) #Atomic and Subatomic Physics Research #Atomic physics #Beta decay #Chemistry #Chromatography #Detector #Double beta decay #Excited state #Limit (mathematics) #Mathematical analysis #Mathematics #Neutrino #Neutrino Physics Research #Nuclear physics #Optics #Physics #Radiation Detection and Scintillator Technologies #State (computer science) #hep-ex #physics.ins-det
paper · pdf · doi:10.1016/j.nuclphysa.2020.121701
published as Nuclear Physics A Volume 996, April 2020, 121701
arxiv created 2020/01/17 · openalex publication_date 2020/01/21 · openalex created_date 2020/01/23 · arxiv updated 2020/11/20 · openalex updated_date 2026/08/05
The double-beta decay of 82Se to the 0+1 excited state of 82Kr has been studied with the NEMO-3 detector using 0.93 kg of enriched 82Se measured for 4.75 y, corresponding to an exposure of 4.42 kg y. A dedicated analysis to reconstruct the gamma-rays has been performed to search for events in the 2e2g channel. No evidence of a 2nbb decay to the 0+1 state has been observed and a limit of T2n 1/2(82Se; 0+gs -> 0+1) > 1.3 1021 y at 90% CL has been set. Concerning the 0nbb decay to the 0+1 state, a limit for this decay has been obtained with T0n 1/2(82Se; 0+g s -> 0+1) > 2.3 1022 y at 90% CL, independently from the 2nbb decay process. These results are obtained for the first time with a tracko-calo detector, reconstructing every particle in the final state.