T=1 states in Rb74 and their Kr74 analogs

Charge symmetry breaking effects that perturb analog symmetry between nuclei are usually small but are important in extracting reliable Fermi matrix elements from "superallowed" beta decays and testing conserved vector current theory, especially for the heavier cases. We have used the Ca-40(Ar-36, pn)Rb-74 and Ca-40(Ca-40,alpha pn)Rb-74 reactions at 108, 123 and 160 MeV, respectively, to populate Rb-74 and determine the analog distortion through comparison of T=1 states in Rb-74 with their corresponding Kr-74 levels. We have traced the analogs of the Kr-74 ground-state band in Rb-74 to a candidate spin J=8 state and determined the Coulomb energy differences. They are small and positive and increase smoothly with spin. New T=0 states were found that better delineate the deformed band structure and clarify the steps in deexcitation from high spin. A new T=0 band was found. No evidence was found for gamma decay to or from a low-lying J(pi)=0(+) state in Rb-74 despite a careful search.