Beta-decay of very neutron-rich nuclei relevant to nucleosynthesis

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The beta-decay half-lives of 38 neutron-rich isotopes (18 for first time) from Kr to Tc, which play important role in the r-process nucleosynthesis, have been measured. The results when compared with previous standard models indicate the overestimation in the predicted half-lives by a factor of 2 or more in the A～110 region. The results suggest a more rapid flow of the rapid neutron capture process (r-matter flow) through this region around mass A=110～125 than previously predicted.