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

Bauer, C.; Behrens, T.; Bildstein, V.; Blazhev, A.; Bruyneel, B.; Butterworth, J.; Clement, E.; Coquard, L.; Egido, J. L. and Ekström, Andreas LU , et al. (2012) In Physical Review C (Nuclear Physics) 86(3).
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 Ba-140 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... (More)
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 Ba-140 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 tau(2(1)(+)) = 10.4(-0.8)(+2.2) 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. (Less)
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published
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Physical Review C (Nuclear Physics)
volume
86
issue
3
publisher
American Physical Society
external identifiers
  • wos:000308460800004
  • scopus:84866656909
ISSN
0556-2813
DOI
10.1103/PhysRevC.86.034310
language
English
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yes
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150356ca-04d0-475d-93b0-af9e3edc0fc3 (old id 3139142)
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2012-11-26 14:48:13
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2017-03-05 03:49:43
@article{150356ca-04d0-475d-93b0-af9e3edc0fc3,
  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 Ba-140 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 tau(2(1)(+)) = 10.4(-0.8)(+2.2) 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.},
  articleno    = {034310},
  author       = {Bauer, C. and Behrens, T. and Bildstein, V. and Blazhev, A. and Bruyneel, B. and Butterworth, J. and Clement, E. and Coquard, L. and Egido, J. L. and Ekström, Andreas and Fitzpatrick, C. R. and Fransen, C. and Gernhaeuser, R. and Habs, D. and Hess, H. and Leske, J. and Kroell, T. and Kruecken, R. and Lutter, R. and Marley, P. and Moeller, T. and Otsuka, T. and Patronis, N. and Petts, A. and Pietralla, N. and Rodriguez, T. R. and Shimizu, N. and Stahl, C. and Stefanescu, I. and Stora, T. and Thirolf, P. G. and Voulot, D. and de Walle, J. Van and Warr, N. and Wenander, F. and Wiens, A.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {3},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Prolate shape of Ba-140 from a first combined Doppler-shift and Coulomb-excitation measurement at the REX-ISOLDE facility},
  url          = {http://dx.doi.org/10.1103/PhysRevC.86.034310},
  volume       = {86},
  year         = {2012},
}