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Prolate shape of 140Ba from a first combined Doppler-shift and Coulomb-excitation measurement at the REX-ISOLDE facility

C. Bauer1,*, T. Behrens2, V. Bildstein2, A. Blazhev3, B. Bruyneel3, J. Butterworth4, E. Clément5, L. Coquard1, J. L. Egido6 et al.

A. Ekström7, C. R. Fitzpatrick8, C. Fransen3, R. Gernhäuser9, D. Habs9, H. Hess3, J. Leske1, T. Kröll1,2, R. Krücken2,10, R. Lutter9, P. Marley4, T. Möller1, T. Otsuka11,12, N. Patronis13,14, A. Petts4, N. Pietralla1,15, T. R. Rodríguez15, N. Shimizu12, C. Stahl1, I. Stefanescu13, T. Stora16, P. G. Thirolf9, D. Voulot16, J. van de Walle16, N. Warr3, F. Wenander16, and A. Wiens3

  • 1Institut für Kernphysik, Technische Universität Darmstadt, Darmstadt, Germany
  • 2Physik-Department E12, Technische Universität München, Garching, Germany
  • 3Institut für Kernphysik, Universität zu Köln, Köln, Germany
  • 4Department of Physics, University of York, York, United Kingdom
  • 5GANIL, Caen, France
  • 6Departamento de Fisica Teorica, Universidad Autonoma de Madrid, Madrid, Spain
  • 7Fysiska Institutionen, Lunds Universitet, Lund, Sweden
  • 8Department of Physics, University of Manchester, Manchester, United Kingdom
  • 9Fakultät für Physik, Ludwig-Maximilians-Universität München, Garching, Germany
  • 10TRIUMF, Vancouver, Canada
  • 11Department of Physics, University of Tokyo, Tokyo, Japan
  • 12Center for Nuclear Study, University of Tokyo, Tokyo, Japan
  • 13Instituut voor Kern- en Stralingsfysica, Katholieke Universiteit Leuven, Leuven, Belgium
  • 14Department of Physics, University of Ioannina, Ioannina, Greece
  • 15GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
  • 16CERN, Genève, Switzerland

  • *bauer@ikp.tu-darmstadt.de
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Phys. Rev. C 86, 034310 – Published 7 September, 2012

DOI: https://doi.org/10.1103/PhysRevC.86.034310

Abstract

Background: Quadrupole moments of excited nuclear states are important observables for geometrically interpreting nuclear structure in terms of deformed shapes, although data are scarce and sometimes ambiguous, in particular, in neutron-rich nuclides.

Purpose: A measurement was performed for determining the spectroscopic quadrupole moment of the 21+ state of 140Ba in order to clarify the character of quadrupole deformation (prolate or oblate) of the state in its yrast sequence of levels.

Method: We have utilized a new combined technique of lifetime measurement at REX-ISOLDE and MINIBALL using the Doppler-shift attenuation method (DSAM) and a reorientation analysis of Coulomb-excitation yields.

Results: On the basis of the new lifetime of τ(21+)=10.4−0.8+2.2 ps the electric quadrupole moment was determined to be Q(21+)=−0.52(34) eb, indicating a predominant prolate deformation.

Conclusions: This finding is in agreement with beyond-mean-field calculations using the Gogny D1S force and with results from the Monte Carlo shell-model approach.

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Phys. Rev. C 86, 034310– Published 7 September, 2012
  • Received 16 July 2012

©2012 American Physical Society

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