Lifetime measurements in 93Nb from photon and inelastic neutron scattering

The low-spin structure of Nb-93 has been studied using the Nb-93(gamma,gamma(')), Nb-93(n,n(')gamma) and Zr-94(p,2n gamma gamma)Nb-93 reactions. Lifetimes were determined from both Nb-93(gamma,gamma(')) and Nb-93(n,n(')gamma) measurements. Branching ratios were measured, and multipolarities and spin assignments were determined from the Zr-94(p,2n gamma gamma)Nb-93 angular correlation experiment. From M1 and E2 strengths, the J(pi)=9/2(+) and 7/2(+) states at 1297.1 keV and 1483.6 keV, respectively, are proposed as members of the quintet of mixed-symmetry states associated with the pi 1g(9/2)circle times(2(1,MS)(+),Zr-92) configuration. The large B(M1) values determined in Nb-93 cannot be explained within the weak coupling limit of the interacting boson fermion model.