科研之友
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摘要
A search for the radiative neutrinoless double-electron capture with single gamma-ray emission has been performed in Ni-58. Gamma radiation from a 7286 g nickel sample in natural isotope composition was measured for 58.3 d with an ultra-low background HPGe detector in the Felsenkeller underground laboratory in Dresden, Germany. A new lower half-life limit of 2.1 x 10(21) yr (90% CL) was obtained for this decay mode. This half-life limit is two orders of magnitude higher than the existing limit for 58Ni and among the best half-life limits for neutrinoless double-electron capture decays.
- 出版日期2016-6
