Mainz 2012 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 31: Nukleare Astrophysik
HK 31.1: Group Report
Wednesday, March 21, 2012, 16:30–17:00, RW 2
Investigation of decays of r-process nuclei — •Michele Marta1,2, Iris Dillmann1,2, and Alexey Evdokimov1,2 — 1GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — 2II. Physikalisches Institut, Justus-Liebig Universität Giessen, Germany
The r-process nucleosynthesis accounts for about half of the solar abundances beyond the iron peak. A complete understanding of the process is complicated by the scarce experimental information of the many short-lived neutron-rich nuclei of interest along the r-process path. Particularly, non-zero β-delayed neutron branchings divert the material flow back to stability during the freeze-out phase and provide additional neutrons which can be recaptured. A recent experimental campaign at the fragment separator FRS facility at GSI has investigated decay half-lives and following neutron emission of unstable nuclei close to the neutron shell closure N = 82 and N = 126. The fragments produced by a 1 A·GeV primary beam of uranium on a 9Be target have been separated in-flight, identified, and implanted in a segmented Si array detector. Thirty 3He counters in a polyethylene matrix surrounded the implantation station and detected the delayed neutrons in coincidence with β-decays in the Si detector. The status of the ongoing analysis and an outlook are presented.