Os188,190,192(t,p)reaction at 15 MeV

A study of the heavier osmium isotopes ${}_{}{}^{190}{}_{}{}^{}\mathrm{Os}$, ${}_{}{}^{192}{}_{}{}^{}\mathrm{Os}$, and ${}_{}{}^{194}{}_{}{}^{}\mathrm{Os}$ has been made with the ($t,p$) reaction using a 15 MeV triton beam. The osmium nuclei may be considered as transitional nuclei going from a deformed to a spherical shape with increasing neutron number and the ($t,p$) reaction is used to probe this change. The study principally investigates the position and strength of the $0^{+}$ states, a number of new such states being observed. The nucleus ${}_{}{}^{194}{}_{}{}^{}\mathrm{Os}$ is also reported in some detail for the first time with 15 excited levels observed and 7 spin assignments made.