F. K. McGowan

Coulomb Excitation of States in Pt 195

Gannma rays of 99, 110, 130, 140, 210, and 240 kev were observed from Coulomb excitation of Pt/sup 195/ (plati-num target containing 60.1% Pt/sup 195/) with 3.0- to 5.5-Mev protons and alpha particles. The energy dependence of the gamma-ray yields indicates direct excitation of states at 99, 130, 210, and 240 kev. The 140-kev gamma ray is a cascade transition between states at 240 and 99 kev. These results do not agree with the conclusions of Bernstein and Lewis who measured the Coulomb excitation functions of the internal conversion electrons and found evidence for direct excitation of levels at 3l and 130 kev but no evidence for direct excitation of a level at 99 kev. The angular distributions of the 240- and 210-kev gamma rays and the 140-kev gamma ray in coincidence with K x rays from internal conversion of the 99-kev transition were measured with respect to the incident ion beam on a thick target. These measured distributions are consistent with an assignment of 5/2(E2)1/2, 3/2(E2 + M1)1/2 with (E2/M1)/sup 1/2/ = 0.37 plus or minus 0.02, and 5/2(E2 + M1)3/2 with (E2/M1)/sup 1/2/ = - (0.13 plus or minus 0.03) for the 240-, 210-, and 140-kev transitions,.respectively. Themorexa0» B(E2) and B(M1) for decay of these states were determined. (auth)«xa0less