$\ensuremath{\gamma}$-soft shapes and quasiparticle excitations in ${}_{73}^{161}{\mathrm{Ta}}_{88}$

$γ$ -soft shapes and quasiparticle excitations in $_{73}^{161} {Ta}_{88}$

K. Lagergren et al.

Phys. Rev. C 83, 014313 – Published 26 January 2011

Abstract

Excited states in the neutron-deficient odd- $Z$ nuclide ${}^{161}{Ta}$ were identified for the first time using the ${}^{106}{Cd}$ ( ${}^{58}{Ni}$ ,3 $p$ $γ$ ) reaction at a beam energy of 270 MeV. The $π h_{11 / 2}$ band, yrast at low spin, was observed up to $(47 / 2^{-})$ and a further four strongly coupled bands have been established to high spin. Quasiparticle configuration assignments for the new band structures have been made on the basis of cranked shell model calculations. This work suggests that the negative-parity $ν (f_{7 / 2}, h_{9 / 2})$ orbitals are responsible for the first rotational alignment in the $π h_{11 / 2}$ band.