Investigating the Double Beta Decay of 58Ni |
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| Authors: | N. I. Rukhadze V. B. Brudanin A. A. Klimenko F. Piquemal E. N. Rukhadze Yu. A. Shitov I. Štekl G. Warot |
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| Affiliation: | 1.Joint Institute for Nuclear Research,Dubna,Russia;2.Laboratoire Souterrain de Modane,Modane,France;3.Institute of Experimental and Applied Physics,Czech Technical University in Prague,Praha 2,Czech Republic |
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| 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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