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International Conference on Particles and Nuclei, Eilat : Israël (2008)
First access to $\beta$ half-lives approaching the r-process path near N=126
T. Kurtukian-Nieto, J. Benlliure, L. Audouin1, F. Becker2, B. Blank3, I.N. Borzov2, E. Casarejos, M. Fernandez-Ordonez, J. Giovinazzo3, D. Henzlova2, B. Jurado2, K. Langanke2, 4, G. Martinez-pinedo2, J. Pereira, F. Rejmund5, K.-H. Schmidt2, O. Yordanov2

Heavy neutron-rich nuclei close to N=126 were produced by fragmentation of a 1 A GeV 208Pb beam at the FRS at GSI. The beta-decay half-lives of 8 nuclides have been determined. The comparison of the data with model calculations including an approach based on the self-consistent ground-state description and continuum QRPA considering the Gamow-Teller and first-forbidden decays provide a first indication on the importance of first-forbidden transitions around A=195. The measured data indicate that the matter flow in the r-process to heavier fissioning nuclei is faster than previously expected.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  GSI - Gesellschaft für Schwerionenforschung mbH
3 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
4 :  Institut für Kernphysik
5 :  GANIL - Grand Accélérateur National d'Ions Lourds
Physique/Physique Nucléaire Expérimentale
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