Negative parity states of even-APt isotopes from proton inelastic scattering

Negative parity states of ${}_{}{}^{194}{}_{}{}^{}$,196,198Pt are studied via the analysis of previously reported (p,p’) data. The results suggest that two-quasiparticle configurations built on the nonexcited core play significant roles in the $7_1^{\mathrm{-}}$ states, as predicted by the semidecoupled model and suggested by electron-capture data. It is also found that the $3_1^{\mathrm{-}}$ states can be understood in an octupole vibrational picture. The latter result highlights an anomaly in the behavior of octupole states in the Pt-Hg region.