Darmstadt 2016 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Nuclear Astrophysics IV

HK 50.4: Talk

Thursday, March 17, 2016, 15:15–15:30, S1/01 A04

Cross-section measurement of the ¹⁰⁸Cd(α,n)¹¹¹Sn reaction at the Cologne Clover Counting Setup — •Felix Heim, Jan Mayer, Lars Netterdon, Philipp Scholz, and Andreas Zilges — Institute of Nuclear Physics, University of Cologne

About 30 to 35 neutron deficient nuclei cannot be synthesized via neutron capture processes. The main mechanism that is used to describe their origin is the so-called γ-process, i.e. a photodesintegration reaction network on stable seed nuclei in explosive stellar environments. The network of this process includes so many different reactions and nuclei that cross-section values are predominantly calculated in the scope of the Hauser-Feshbach statistical model. The obtained values heavily depend on the input-parameters like the γ-ray strength function or particle+nucleus optical-model-potential (OMPs). In order to extend the available experimental database the ¹⁰⁸Cd(α,n)¹¹¹Sn reaction cross section was investigated at ten energies between 10.2 MeV and 13.5 MeV via the activation technique using the Cologne Clover Counting Setup. As this reaction is almost completely sensitive to the α-decay width, the results were compared to statistical model calculations using different models of the α-OMP. In this talk the experimental setup, the results of the cross-section measurement as well as the results from the statistical model calculations will be presented.
Supported by the DFG (INST 216/544-1) and the ULDETIS project within the UoC Excellence Initiative institutional strategy. P.S. and J.M. are supported by the Bonn-Cologne Graduate School for Physics and Astronomy.