Pt194,196,198(p,t) reactions at 35 MeV

The ${}_{}{}^{194,196,198}{}_{}{}^{}\mathrm{Pt}$($p$,$t$) 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 ${}_{}{}^{194}{}_{}{}^{}\mathrm{Pt}$ and ${}_{}{}^{196}{}_{}{}^{}\mathrm{Pt}$ and sixty-four in ${}_{}{}^{192}{}_{}{}^{}\mathrm{Pt}$, 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 $J^{\pi }$ 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 ${}_{}{}^{192}{}_{}{}^{}\mathrm{Pt}$, 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 ${}_{}{}^{196,198}{}_{}{}^{}\mathrm{Pt}$($p$,$t$) 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.