Abstract
The γ process is assumed to play an important role in the nucleosynthesis of the majority of the p nuclei. Since the network of the γ process includes so many different reactions and - mainly unstable - nuclei, cross-section values are predominantly calculated in the scope of the Hauser-Feshbach statistical model. The values heavily depend on the nuclear-physics input parameters. The results of total and partial cross-section measurements are used to improve the accuracy of the theoretical calculations. In order to extend the experimental database, the 107 Ag(p,γ )108 Cd reaction was studied via the in-beam method at the high-efficiency HPGe γ -ray spectrometer HORUS at the University of Cologne. Proton beams with energies between 3.5 MeV and 5.0 MeV were provided by the 10 MV FN-Tandem accelerator leading to the determination of four new total cross-section values. After slight adjustments of the nuclear level density and γ -ray strength function an excellent agreement between theoretical calculations and experimentally deduced values for both total and partial cross sections has been obtained.
Highlights
About 30 to 35 neutron-deficient nuclei are bypassed by neutron-capture processes and the question about their detailed origin is still open
There are several different processes in various astrophysical scenarios proposed which might contribute to the synthesis of the so-called p nuclei [1, 2]
In order to predict reaction rates or cross-section values, one often has to rely on statistical model calculations which are mostly performed in the scope of the Hauser-Feshbach statistical model
Summary
About 30 to 35 neutron-deficient nuclei are bypassed by neutron-capture processes and the question about their detailed origin is still open. In order to study the nuclear level density as well as the γray strength function the 107Ag(p,γ)108Cd reaction was measured, for which the Gamow window is between 1.77 MeV and 3.83 MeV at T9=3 [3]. Preliminary experimental results on the measurements of total and partial cross-section values of the 107Ag(p,γ)108Cd reaction as well as the comparison to statistical model calculations are presented.
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