Heidelberg 2015 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 29: Nuclear Astrophysics 2
HK 29.3: Vortrag
Dienstag, 24. März 2015, 17:45–18:00, K/HS2
Cross-section measurement of the 130Ba(p,γ)131La reaction for γ process nucleosynthesis — •Jan Mayer, Lars Netterdon, Philipp Scholz, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne
The γ process is an important nucleosynthesis mechanism to explain the abundances of the majority of p nuclei, which are bypassed by neutron capture processes. To improve the accuracy of reaction rates predicted by theoretical models, precise experimental data is required.
Total reaction cross-section values of the 130Ba(p,γ)131La reaction were measured by means of the activation method [1]. Proton beams with energies between 3.6 MeV and 5 MeV were provided by the 10 MV FN-Tandem accelerator at the University of Cologne. After the irradiation, the reaction yield was determined by use of γ-ray spectroscopy using two clover-type high-purity germanium detectors.
The measured cross-section values are compared to Hauser-Feshbach calculations using the Statistical Model codes TALYS and SMARAGD with different proton+nucleus optical model potentials. In addition, an experimentally supported recommendation for the stellar proton-capture reactivity is given. Supported by the DFG (INST 216/544-1).
[1] L. Netterdon et al., Phys. Rev. C 90 (2014) 035806