Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Nukleare Astrophysik
HK 49.7: Vortrag
Donnerstag, 20. März 2014, 18:15–18:30, HZ 5
New time-of-flight data for the neutron capture cross-section of 63Cu — •M. Weigand1, T.A. Bredeweg2, A. Couture2, M. Jandel2, J.M. O’Donnell2, R. Reifarth1 und J.L. Ullmann2 — 1Goethe Universität, Frankfurt, Germany — 2LANL, Los Alamos, USA
One of the important questions in nuclear astrophysics is how the observed abundances of elements came to be. Nearly all of the elements beyond the iron peak 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, and on nuclear parameters like half-lifes and neutron capture cross-sections (NCS). Thus, there is a big need for experimental data on the involved reactions to calculate their stellar rates to understand s-process nucleosynthesis.
The NCS of the copper isotopes influences the isotopic ratios of Zn. Former experiments concerning the NCS of 63Cu showed large discrepancies. In order to determine the 63Cu(n,γ) cross-section 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 experiment will be presented.
This work is supported by the Helmholtz Nachwuchsgruppe VH-NG-327 and the Nuclear Astrophysics Virtual Institute NAVI.