Deviations from axial symmetry in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow/><mml:mrow><mml:mn>181</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Os</mml:mi></mml:math>
Abstract
Lifetimes of rotational states built on the ${7/2}^{\ensuremath{-}}[514]$ and ${1/2}^{\ensuremath{-}}[521]$ Nilsson single-particle orbitals in ${}^{181}\mathrm{Os}$ have been measured using the coincidence recoil-distance method. The experimentally determined quadrupole moment, assuming axial symmetry, is $\ensuremath{\approx}20%$ larger for the ${7/2}^{\ensuremath{-}}[514]$ band compared with the ${1/2}^{\ensuremath{-}}[521]$ band. The difference can be understood as an effect of triaxiality. Total Routhian surface calculations show deviations from axial symmetry for both bands, leading to good agreement between theory and experiment.