A search for the radiative neutrinoless double electron capture of $^{58}$Ni

TL;DR

This study searches for neutrinoless double electron capture in nickel-58, setting a new lower half-life limit that surpasses previous bounds and advances the understanding of rare nuclear decay processes.

Contribution

The paper reports the first search for radiative neutrinoless double electron capture in $^{58}$Ni and establishes a significantly improved half-life lower limit.

Findings

New half-life limit of 2.1 x 10^{21} years for $^{58}$Ni decay

Improved sensitivity over previous experiments by two orders of magnitude

Among the best limits for neutrinoless double electron capture decays

Abstract

A search for the radiative neutrinoless double electron capture with single \gray\ emission has been performed in $^{58}$Ni. 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 $2.1 \times 10^{21}$ yr (90% CL) was obtained for this decay mode. This half-life limit is two orders of magnitude higher than the existing limit for $^{58}$Ni and among the best half-life limits for neutrinoless double electron capture decays.