Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Nuclear Astrophysics I

HK 4.6: Vortrag

Montag, 26. Februar 2018, 15:30–15:45, HZO 100

Investigating total and partial cross sections of the ¹⁰⁷Ag(p,γ)¹⁰⁸Cd reaction — •Felix Heim¹, Elena Hoemann¹, Jan Mayer¹, Philipp Scholz¹, Mark Spieker^1,2, and Andreas Zilges¹ — ¹Institute for Nuclear Physics, University of Cologne — ²NSCL, Michigan State University, MI 48824, USA

The γ process plays 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 depend heavily on the nuclear physics input-parameters like the nuclear level density (NLD), the γ-ray strength function (γ-ray SF) and nucleon+nucleus optical model potentials (OMPs). Total and partial cross-section measurements can improve the accuracy of the theoretical calculations. To extend the experimental database the ¹⁰⁷Ag(p,γ)¹⁰⁸Cd 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 and 5.0 MeV were provided by the 10 MV FN-Tandem accelerator. The comparison of the experimental results to Hauser-Feshbach calculations allowed to find adjusted microscopic models for the NLD and γ-ray SF, which very nicely reproduce the results of total and partial cross sections.

Supported by the DFG (ZI 510/8-1) and the ULDETIS project within the UoC Excellence Initiative institutional strategy.