Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 67: Nukleare Astrophysik
HK 67.5: Talk
Thursday, March 7, 2013, 15:15–15:30, HSZ-403
Measurement of the 20N(γ,n)19N reaction rate for r-process nucleosynthesis — •Marko Röder1,2, Daniel Bemmerer2, Thomas Cowan1,2, Zoltán Elekes2, Tobias Reinhardt1,2, Andreas Wagner2, and Kai Zuber1 — 1Institut für Kern- und Teilchenphysik, Technische Universität Dresden — 2Helmholtz-Zentrum Dresden-Rossendorf (HZDR)
In the astrophysical r-process (rapid neutron capture process), that is important for the nucleosynthesis of heavy elements, many neutron-rich nuclei are involved. The reactions on these exotic nuclei can only be studied with radioactive ion beams since target material cannot be fabricated from them. One example of these reactions is the 19N(n,γ)20N reaction that is important in a neutrino-driven wind scenario. Using 20N as a beam, this reaction was studied at GSI in inverse kinematics via Coulomb-dissociation exploiting the virtual gamma field of a heavy target in the so called s393-experiment. The experiment was performed at the LAND/R3B setup (Large Area Neutron Detector, Reactions with Relativistic Radioactive Beams) in a kinematically complete measurement, i.e., detecting all particles leaving the nuclear reaction. The neutrons flying at relativistic velocity were observed by the LAND-detector, the calibration of which plays a crucial role for the above specific reaction. I will give an overview of the R3B-setup, the calibration of the LAND-detector and a status of the analysis of the 20N(γ,n)19N reaction.
— Supported by GSI F&E (DR-ZUBE) and NupNET NEDENSAA (05 P09 CRFN5).