Inelastic proton scattering has been used to measure the dσ/dΩ and ${\mathit{A}}_{\mathit{y}}$ angular distributions for several low-lying collective states in ${}_{}{}^{194,196}{}_{}{}^{}\mathrm{Pt}$ using 647 MeV polarized protons with special emphasis on the excitation of the $4^{+}$ states below 2 MeV. The data have been analyzed in the framework of the coupled-channels scheme using the program ecis. Large E4 transition strengths to the $4^{+}$ states in both nuclei are found in sharp contrast with the predictions of the interacting boson model with only s (L=0) and d (L=2) bosons. It is found that although the E2 properties of these nuclei are consistent with the interacting boson model (sd) predictions, higher degrees of freedom, e.g., g (L=4) bosons, need to be invoked in order to get a reasonable agreement with the measured E4 properties.

• Received 6 May 1991

DOI:https://doi.org/10.1103/PhysRevC.44.700