First access to beta half-lives approaching the r-process path near N=126

Authors :: Kurtukian-Nieto, T.
Benlliure, J.
Audouin, L.
Becker, F.
Blank, B.
Borzov, I. N.
Casarejos, E.
Fernandez-Ordonez, M.
Giovinazzo, J.
Henzlova, D.
Jurado, B.
Langanke, K.
Martinez-Pinedo, G.
Pereira, J.
Rejmund, F.
Schmidt, K. -H.
Yordanov, O.
Publication Year :: 2007
Abstract: 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.<br />Comment: 4 pages, 4 figures

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