Search for Double-Beta Decay of 82Se into 82Kr Excited States Using the OBELIX Installation
Barabash A.S. Warot G. Nagorny S. Pagnanini L. Pirro S. Ponomarev D.V. Rozov S.V. Rukhadze N.I. Shitov Y.A. Stekl I. Khusainov T.K. Yumatov V.I. Yakushev E.A.
June 2025Pleiades Publishing
Physics of Particles and Nuclei
2025#56Issue 3831 - 834 pp.
Abstract—: A search for the processes of double beta decay of 82Se into excited states of 82Kr is conducted using the OBELIX setup. The measurements are conducted using a 600 cm3 HPGe detector. The detector is surrounded by 6.5 kg of enriched selenium (the content of 82Se was ~92.5%). The data collected over 17 572.2 h of measurements are given. As a result, a world-record sensitivity is reached for transitions of this type. Specifically, we have found an indication of the existence of two-neutrino 82Se decay into the first 0+82Kr excited state with a half-life of × 1022 years.
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National Research Center “Kurchatov Institute, Moscow, 123182, Russian Federation
Modane Underground Laboratory, F-73500, France
Department of Physics, Engineering Physics and Astronomy, Queen’s University Kingston, Ontario, K7L 3N6, Canada
Gran Sasso National Laboratory, INFN, Assergi, Italy
Gran Sasso Scientific Institute, L’Aquila, Italy
Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, Moscow oblast, Dubna, 141980, Russian Federation
Institute of Experimental and Applied Physics, Czech Technical University in Prague, Prague, 11000, Czech Republic
Institute of Nuclear Physics, Ministry of Energy of the Republic of Kazakhstan, Almaty, 050032, Kazakhstan
National Research Center “Kurchatov Institute
Modane Underground Laboratory
Department of Physics
Gran Sasso National Laboratory
Gran Sasso Scientific Institute
Laboratory of Nuclear Problems
Institute of Experimental and Applied Physics
Institute of Nuclear Physics
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