Deexcitation gamma-ray transitions from the long-lived I-pi=13/2(+) metastable state in Os-195

Deexcitation gamma rays associated with an isomeric state of the Os-195 were measured for the first time. The half-life of the isomeric state of the neutral atom Os-195m was deduced. The isomers were produced in multinucleon transfer reactions between Xe-136 beams and Pt-198 targets, and were collected and separated by KEK Isotope Separation System. Analysis of gamma-gamma correlation and comparison with previous measurement of the isomeric state using the ESR at GSI Darmstadt suggests a possible decay scheme of (195)mOs.