Abstract
Double beta decay (β + EC, EC/EC) of 58Ni is investigated at France’s Modane Underground Laboratory (4800 m water equivalent) using the OBELIX ultralow-background HPGe detector with a sensitive volume of 600 cm3 and a natural nickel sample of ~68% 58Ni with a mass of ~21.7 kg. After preliminary analysis of the experimental data accumulated over ~144 days, new experimental limits are obtained for the 2νβ+EC decay of 58Ni to the 0+ ground state and the 2 +1 , 811 keV excited state of 58Fe, and for the 2νEC/EC decay of 58Ni to the 2 +1 , 811 keV and 2 +2 , 1675 keV excited states of 58Fe. The limits are T1/2(β+EC,0→0+) > 1.7 × 1022 yr, T1/2(β+EC,0→2 +1 ) > 2.3 × 1022 yr, T1/2(EC/EC,0→2 +1 ) > 3.3 × 1022 yr, and T1/2(EC/EC,0→2 +2 ) > 3.4 × 1022 yr. Experimental limit T1/2(0νEC/EC–res, 1918 keV > 4.1 × 1022 yr is obtained for resonant neutrinoless radiative EC/EC decay with an energy of 1918.3 keV. All limits are at 90% CL.
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Original Russian Text © N.I. Rukhadze, V.B. Brudanin, A.A. Klimenko, F. Piquemal, E.N. Rukhadze, Yu.A. Shitov, I. Štekl, G. Warot, 2018, published in Izvestiya Rossiiskoi Akademii Nauk, Seriya Fizicheskaya, 2018, Vol. 82, No. 6.
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Rukhadze, N.I., Brudanin, V.B., Klimenko, A.A. et al. Investigating the Double Beta Decay of 58Ni. Bull. Russ. Acad. Sci. Phys. 82, 708–711 (2018). https://doi.org/10.3103/S1062873818060242
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DOI: https://doi.org/10.3103/S1062873818060242