The nucleus of ${}^{173}\mathrm{Ta}$ was populated using the reaction ${}^{159}\mathrm{Tb}{(}^{18}\mathrm{O}{,4n)}^{173}\mathrm{Ta}$ at a beam energy of 84 MeV. Lifetime measurements in the bands built on two Nilsson configurations $\pi h_{9/2}\left[541\right]{1/2}^{-}$ and $\pi g_{7/2}\left[404\right]{7/2}^{+}$ were performed using the recoil-distance Doppler shift method. The measured lifetimes were used to extract the reduced transition probabilities $B\left(E2\mathrm{}\right).$ Microscopic Hartree-Fock theory with the angular momentum projection was used for calculating the reduced transition probabilities. The $Q_t$ values obtained from the measured $B\left(E2\mathrm{}\right)\mathrm{}$ values show a larger collectivity for the $h_{9/2}$ band as compared to the $g_{7/2}$ band. Cranked Hartree-Fock Bogoliubov calculations were used for calculating the quasiparticle Routhians. The experimental results in conjunction with the cranking calculations also explain the experimental band-crossing delays associated with the $i_{13/2}$ neutron alignment in the ${}^{173}\mathrm{Ta}$ nucleus.

• Received 1 December 2000

DOI:https://doi.org/10.1103/PhysRevC.64.034303