PT-194, PT-196, PT-198(P,T) REACTIONS AT 35-MEV

The Pt194,196,198(p,t) reactions have been studied at a proton energy of 35 MeV using nuclear emulsion plates and a high-resolution position-sensitive proportional counter. Fifty states were observed in Pt194 and Pt196 and sixty-four in Pt192, many for the first time. Angular distributions were measured for many of these levels from 7°to 60° and the results were compared with zero-range distored wave Born approximation calculations. Several new Jπ assignments were made using distorted wave Born approximation and empirical shapes of transitions to well-known levels in Pt and Pb. No new levels, in particular, no new 0+ levels, were seen below 1.5 MeV excitation. A new 0+ level at 1.628 MeV was found in Pt192, and new levels tentatively assigned to be 4+ were seen in all three final nuclei near 1.9 MeV with 15% of the ground state strength at 7° in the Pt196,198(p,t) reactions. Enhancement factors were calcualted for simple two-neutron pickup configurations. A comparison is made between experimental (p,t) strengths and those calculated in the O(6) limit of the interacting boson approximation model for L=0, 2 transitions. NUCLEAR REACTIONS Pt194(p,t), Pt196(p,t), and Pt198(p,t), Ep=35 MeV; measured σ(Et,θ); deduced energies, Jπ, and strengths; DWBA calculations, comparison with experiment; enhancement factors. Enriched targets, 7 keV resolution (plates); interacting boson approximation model. © 1979 The American Physical Society.