Recent progress in measuring β half-lives of nuclei approaching the r-process waiting point A = 195

T. Kurtukian Nieto (1, 2) , J. Benlliure (1) , K.-H. Schmidt (3) , L. Audouin (4) , F. Becker (3) , Bertram Blank (2) , I.N. Borzov (3) , E. Casarejos (1) , M. Fernandez-Ordonez (1) , J. Giovinazzo (2) , D. Henzlova (3) , B. Jurado (2) , K. Langanke (3, 5) , G. Martinez-Pinedo (3) , J. Pereira (1) , F. Rejmund (6) , O. Yordanov (3)

1 USC - Universidade de Santiago de Compostela [Spain]
2 CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
3 GSI - Helmholtz zentrum für Schwerionenforschung GmbH
4 IPNO - Institut de Physique Nucléaire d'Orsay
5 Institut für Kernphysik
6 GANIL - Grand Accélérateur National d'Ions Lourds

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 β-decay half-lives of 8 nuclides have been determined using a novel numerical analysis method. The comparison of the data with model calculations provides indications 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 may be faster than previously expected.

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

T. Kurtukian Nieto, J. Benlliure, K.-H. Schmidt, L. Audouin, F. Becker, et al.. Recent progress in measuring β half-lives of nuclei approaching the r-process waiting point A = 195. The Eighteenth Particles and Nuclei International Conference – PANIC08, Nov 2008, Eilat, Israel. pp.587c-589c, ⟨10.1016/j.nuclphysa.2009.05.129⟩. ⟨in2p3-00408690⟩