/ Experiment-Nucl

Investigation of double beta decay of $^{58}$Ni with the Obelix spectrometer

Brudanin, V.B. (Moscow Phys. Eng. Inst.) ; Klimenko, A.A. (Dubna Intl. Univ.) ; Piquemal, F. (Modane, Lab. Souterrain) ; Rukhadze, E. (IEAP CTU, Prague) ; Rukhadze, N.I. (Dubna, JINR) ; Shitov, Yu. A. (Imperial Coll., London) ; Stekl, I. (IEAP CTU, Prague) ; Warot, G. (Modane, Lab. Souterrain)

Published in: AIP Conf.Proc.
Year: 2017
Vol.: 1894    Num./Issue: 1
Page No: 020020
Year: 2017-10-16 published

Abstract: Investigation of double beta decay processes (β+EC, EC/EC) of 58Ni was performed at the Modane underground laboratory (LSM, France, 4800 m w.e.) using ultra low-background HPGe detector Obelix with sensitive volume of 600 cm3 and a sample of natural nickel, containing ∼68% of 58Ni with a mass of ∼21.7 kg. New experimental limits on 2νβ+EC decay of 58Ni to the ground 0+ and 21+, 811 keV excited state of 58Fe, and 2νEC/EC decay of 58Ni to 21+, 811 keV and 22+ 1 675 keV excited states of 58Fe were obtained from the preliminary calculation of experimental data accumulated in ∼88d. They are - T1/2(β+ EC, 0+ → 0+) > 1.4 ×1021 y; T1/2(β+EC,0+→21+)>1.7×1022 y, T1/2(EC/EC, 0+→21+)>2.4×1022 y, T1/2(EC/EC, 0+→22+)>2.1×1022 y. For resonant neutrino-less radiative EC/EC decay with energy of 1 918.3 keV a new experimental limit of T1/2 (0νEC/EC − res, 1918keV) > 4.7 ×1022 y was also obtained. All limits are at 90 % CL.

Total numbers of views: 245
Numbers of unique views: 140
DOI: 10.1063/1.5007645
 Record created 2017-11-02, last modified 2017-11-02

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