|Title: ||Prolate shape of 140Ba from a first combined Doppler-shift and Coulomb-excitation measurement at the REX-ISOLDE facility|
|Authors: ||Bauer, C. ×|
van de Walle, J.
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.
|Publication status: ||published|
|KU Leuven publication type: ||IT|
|Appears in Collections:||Nuclear and Radiation Physics Section|