  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.

Nuclear Experiment