Abstract
The lifetimes of 14 excited states in 91Nb and lower bounds for 5 additional states were measured with the Doppler-shift attenuation method, utilizing the 91Zr(p, nγ) 91Nb reaction. By using calibrated F( τ) curves, the uncertainty of the stopping power was reduced to about 15 %. Multipole mixing ratios were determined for several transitions from the γ-ray angular distributions. The experimental data on γ-ray transition probabilities were compared with theoretical values. These were calculated using shell-model wave functions based on a 88Sr core and active protons in the 2 p 1 2 and 1 g 9 2 orbitals. For the negative-parity states also excitations of protons from the 2 p 3 2 and 1 f 5 2 orbitals were taken into account.
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