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Rukhadze, N. I.; Barabash, A. S.; Brudanin, V. B.; Klimenko, A. A.; Konovalov, S. I.; Rakhimov, A. V.; Rukhadze, E. N.; Shitov, Yu. A.; Stekl, I.; Umatov, V. I.; Warot, G.
Bulletin of the Russian Academy of Sciences. Physics, 08/2020, Letnik: 84, Številka: 8Journal Article
Double beta decay (β + EC, EC/EC) of 74 Se 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 cm 3 and a sample of natural selenium with a mass of 1.6 kg containing ~0.89% (~14.24 g) of 74 Se. The new experimental limits for β + EC and EC/EC decays of 74 Se to ground 0 + and excited 596 keV, and 1204 keV states of 74 Ge, were obtained from experimental data accumulated over 135 days.
