Title: Prolate shape of 140Ba from a first combined Doppler-shift and Coulomb-excitation measurement at the REX-ISOLDE facility
Authors: Bauer, C. ×
Behrens, T.
Bildstein, V.
Blazhev, A.
Bruyneel, B.
Butterworth, J.
Cl´ement, E.
Coquard, L.
Egido, J.L.
Ekstr¨om, A.
Fitzpatrick, C.R.
Fransen, C.
Gernh¨auser, R.
Habs, D.
Hess, H.
Leske, J.
Kr¨oll, T.
Kr¨ucken, R.
Lutter, R.
Marley, P.
M¨oller, T.
Otsuka, T.
Patronis, Nikolaos
Petts, A.
Pietralla, N.
Rodr´─▒guez, T.R.
Shimizu, N.
Stahl, C.
Stefanescu, Irina
Stora, T.
Thirolf, P.G.
Voulot, D.
van de Walle, J.
Warr, N.
Wenander, F.
Wiens, A. #
Issue Date: Sep-2012
Publisher: Published for the American Physical Society by the American Institute of Physics
Series Title: Physical Review C, Nuclear Physics vol:86
Article number: 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 2+1 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 (2+1 ) = 10.4+2.2−0.8 ps the electric quadrupole moment was determined to be Q(2+1 ) = −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.
ISSN: 0556-2813
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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