A two-crystal gamma-ray spectrometer was used over a measurement time
of 100 h. Limits are established on the half-life for Ni-58 decay by t
he e-e+-conversion channel: T1/2(0v+2v) > 7.0 X 10(20) yr and T1/2(0v2v) > 4.0 X 10(20) yr for the 0+-0+ and 0+-2+ transitions, respectivel
y.