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HK: Fachverband Physik der Hadronen und Kerne

HK 4: Nuclear Astrophysics I

HK 4.1: Gruppenbericht

Montag, 26. Februar 2018, 14:00–14:30, HZO 100

Experimental Nuclear Astrophysics in Cologne — •Philipp Scholz, Felix Heim, Elena Hoemann, Marvin Körschgen, Jan Mayer, and Andreas Zilges — Institute for Nuclear Physics, University of Cologne

Nuclear reaction cross sections are one of the main ingredients for the understanding of nucleosynthesis processes in stellar environments. For isotopes heavier than those in the iron-peak region, reaction rates are often calculated using the Hauser-Feshbach statistical model (HF). The accuracy of these reaction rates crucially depend on the uncertainties of nuclear-physics input-parameters like γ-strength functions, optical-model potentials, and level densities.

The combination of the 10 MV FN-Tandem accelerator and the high-efficiency γ-ray spectrometer HORUS at the University of Cologne enables the investigation of γ-strength functions and level-densities via radiative proton-capture reactions.

This talk will introduce the in-beam technique with HPGe detectors as well as the method of two-step γ-ray cascades to the recently performed experiments on the ⁶³Cu(p,γ) and ⁶⁵Cu(p,γ) reactions. In addition, an overview about investigations of optical-model potentials and half-lives of long lived-isotopes via the activation technique will be given.

Supported by the DFG (ZI 510/8-1) and the ULDETIS project within the UoC Excellence Initiative institutional strategy. PS and JM are supported by the Bonn-Cologne Graduate School of Physics and Astronomy.