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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. (author)
- Behrens, T. (author)
- Bildstein, V. (author)
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- Blazhev, A. (author)
- Bruyneel, B. (author)
- Butterworth, J. (author)
- Clement, E. (author)
- Coquard, L. (author)
- Egido, J. L. (author)
- Fitzpatrick, C. R. (author)
- Fransen, C. (author)
- Gernhaeuser, R. (author)
- Habs, D. (author)
- Hess, H. (author)
- Leske, J. (author)
- Kroell, T. (author)
- Kruecken, R. (author)
- Lutter, R. (author)
- Marley, P. (author)
- Moeller, T. (author)
- Otsuka, T. (author)
- Patronis, N. (author)
- Petts, A. (author)
- Pietralla, N. (author)
- Rodriguez, T. R. (author)
- Shimizu, N. (author)
- Stahl, C. (author)
- Stefanescu, I. (author)
- Stora, T. (author)
- Thirolf, P. G. (author)
- Voulot, D. (author)
- de Walle, J. Van (author)
- Warr, N. (author)
- Wenander, F. (author)
- Wiens, A. (author)
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- (creator_code:org_t)
- 2012
- 2012
- English.
- In: Physical Review C (Nuclear Physics). - 0556-2813. ; 86:3
- Journal article (peer-reviewed)
Abstract
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
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- ref (subject category)
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- Bauer, C.
- Behrens, T.
- Bildstein, V.
- Blazhev, A.
- Bruyneel, B.
- Butterworth, J.
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- Clement, E.
- Coquard, L.
- Egido, J. L.
- Ekström, Andreas
- Fitzpatrick, C. ...
- Fransen, C.
- Gernhaeuser, R.
- Habs, D.
- Hess, H.
- Leske, J.
- Kroell, T.
- Kruecken, R.
- Lutter, R.
- Marley, P.
- Moeller, T.
- Otsuka, T.
- Patronis, N.
- Petts, A.
- Pietralla, N.
- Rodriguez, T. R.
- Shimizu, N.
- Stahl, C.
- Stefanescu, I.
- Stora, T.
- Thirolf, P. G.
- Voulot, D.
- de Walle, J. Van
- Warr, N.
- Wenander, F.
- Wiens, A.
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- NATURAL SCIENCES
- NATURAL SCIENCES
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- Lund University
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