Observation of (OS)-O-197

Osmium isotope, Os-197, produced with 14 MeV neutrons through the reaction of Pt-198(n,2p)Os-197, has been identified and its decay properties have been studied with a gamma(X) spectroscopic method. The ten new gamma-rays of 41.2, 50.7, 196.8, 199.6, 223.9, 233.1, 250.2, 342.1, 403.6, and 406.4 keV assigned to the decay of Os-197 were observed. The half-life of Os-197 has been determined as 2.8+/-0.6 minutes. A partial decay scheme of Os-197 was proposed.