PT-194,P-198(P-],P') REACTION AND THE INTERACTING BOSON MODEL

Angular distributions of dσ/dΩ and Ay were measured for low-lying collective states, Jπ = 01+, 2+1, 2+2, 4+1, 4+2, 4+3 in 194,198pt using 135 MeV polarized protons. Coupled-channels analysis of the data indicates large E4 moments for the 4i (i = 1, 2, 3) states in both the isotopes. These data have been analyzed in the framework of the interacting boson model (IBM). Although the standard IBM-1 scheme with only s- and d-bosons can describe the E2 properties of both isotopes quite well, a more generalized version which also includes a g-boson is needed to correctly reproduce simultaneously both the E2 and E4 data. Another model using the "projected IBM-2" parameters gives similar results. © 1990.