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>
Zs. PodolyákDepartment of Physics, University of Surrey, Guildford GU2 7XH, United KingdomSareh D. Al-GarniDepartment of Physics, University of Surrey, Guildford GU2 7XH, United KingdomR. F. CastenA.W. Wright Nuclear Structure Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520J. R. CooperA.W. Wright Nuclear Structure Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520D. M. CullenDepartment of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United KingdomΑ. DewaldInstitut für Kernphysik, Univesität zu Köln, Zülpicher Strasse 77, 50937 Köln, GermanyR. KrückenA.W. Wright Nuclear Structure Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520H. B. NewmanA.W. Wright Nuclear Structure Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520J. N. OrceSchool of Engineering, University of Brighton, Brighton BN2 4GJ, United KingdomC. J. PearsonDepartment of Physics, University of Surrey, Guildford GU2 7XH, United KingdomC. A. UrDipartimento di Fisica and INFN, Sezione di Padova, Padova, ItalyR. VenturelliDipartimento di Fisica and INFN, Sezione di Padova, Padova, ItalyS. VincentDepartment of Physics, University of Surrey, Guildford GU2 7XH, United KingdomC. WheldonDepartment of Physics, University of Liverpool, Liverpool L69 7ZE, United KingdomP. M. WalkerDepartment of Physics, University of Surrey, Guildford GU2 7XH, United KingdomF. R. XuDepartment of Physics, University of Surrey, Guildford GU2 7XH, United KingdomA. YamamotoDepartment of Physics, University of Surrey, Guildford GU2 7XH, United KingdomN. V. ZamfirA.W. Wright Nuclear Structure Laboratory, Department of Physics, Yale University, New Haven, Connecticut 06520
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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.
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