Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Poster - Nukleare Astrophysik
HK 57.9: Poster
Mittwoch, 6. März 2013, 16:45–19:00, HSZ 4.OG
Neutron capture on the s-process branch point nucleus 63Ni — •M. Weigand1, T.A. Bredeweg2, A. Couture2, M. Jandel2, F. Käppeler4, G. Korschinek3, C. Lederer1, J.M. O’Donnell2, R. Reifarth1, J.L. Ullmann2, and A. Wallner5 — 1Goethe Universität, Frankfurt, Germany — 2LANL, Los Alamos, USA — 3TUM, Garching, Germany — 4KIT, Karlsruhe, Germany — 5Australian National University, Australia
One of the important questions in nuclear astrophysics is how the observed abundances of elements came to be. Nearly all of it are either formed by the s- or the r-process in almost equal shares. The precise s-process path depends on stellar parameters like temperature and neutron density. In addition, unstable isotopes act as branching points, creating different possible ways for the nucleosynthesis, neutron capture and β−-decay compete, depending on the conditions in the star. This affects the isotopic abundances of the heavier elements. Therefore it is important to know the neutron capture cross section (NCS) for these isotopes. 63Ni is one of these branching points in the weak component of the s-process. In order to determine the NCS in the astrophysical energy region, an experiment has been performed using the calorimetric 4π-BaF2 array DANCE at the Los Alamos National Lab (LANL). The results of the 63Ni(n,γ) experiment will be presented. Various 63Ni resonances have been identified based on the energy deposition in the γ-detector. This work is supported by the Helmholtz Nachwuchsgruppe VH-NG-327 and the Nuclear Astrophysics Virtual Institute NAVI.