Neutron Capture in the Separated Isotopes of Platinum

Abstract

Using the separated isotopes of platinum, irradiated in the pile, the energies of the gamma rays for the activities of Pt 191 , Pt 193 , and Pt 195 have been evaluated. For Pt 191 fifteen gamma rays are found which fit well a simple level scheme. Pt 193 emits isomerically a gamma ray followed by K capture to iridium, with the possible emission of a high-energy gamma. Pt 196 emits a highly converted gamma ray followed by two others in rapid succession decaying to the stable isotope. The half-lives of the three activities are found to be 2.90, 3.35, and 6 days, respectively.

THE DECAY OF Os191 AND Os193

“…The 0.081-Mev transition has been observed in the decay of Ptl" by Cork et al (1954) and Gillon et al (1954) but it has not previously been shown to accompany the OslgL decay. The L1: L2: L3 ratio found here is in excelleilt agreement with the 0.6: 1.1: 1.0 ratio found by Gillon and clearly identifies the transition as a M l + E 2 mixture.…”

Metastable States ofRe180,Ir191,Fischer1 1955Phys. Rev.

“…A 129.1-kev gamma ray going to the ground state of Ir 191 has been observed both from the decay of Os 19115_19 and of Pt 191 . 10 ' 20 The gamma ray has a K = 2A and K/L = 2.2 and thus the transition is a mixture of Ml and £2. Identifying this with the observed gamma ray, the discrepancy in K/L ratios would be explained by a highly ^-converted gamma ray corresponding to the rate determining transition.…”