Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 62: Nukleare Astrophysik
HK 62.1: Gruppenbericht
Freitag, 21. März 2014, 14:00–14:30, HZ 5
Charged-particle induced reaction studies for the astrophysical γ process — •Lars Netterdon1, Martin Baldenhofer1, Jan Mayer1, Anne Sauerwein2, Philipp Scholz1, and Andreas Zilges1 — 1Institute for Nuclear Physics, University of Cologne — 2Institute for Applied Physics, Goethe University Frankfurt am Main
About 35 neutron-deficient nuclei, referred to as p nuclei, are bypassed by the s and r process. The majority of these nuclei is believed to be produced by photodisintegration reactions and subsequent β decays during the γ process. Reaction rates for the γ-process reaction network are mainly predicted by statistical model calculations as experimental data are scarce. In order to reduce the uncertainties in these calculations from the nuclear physics side, the input parameters entering the calculations, such as optical-model potentials and the γ-strength function, must be constrained experimentally. In this talk, an overview of experiments aiming at these input parameters performed at the Institute for Nuclear Physics in Cologne will be given. This includes α-induced reactions on 168Yb [1] and the 130Ba(p,γ) reaction using the activation technique. Moreover, a dedicated setup for in-beam nuclear astrophysics experiments utilizing the high-efficiency HPGe-detector array HORUS will be presented in detail. Total and partial cross-section results of the 89Y(p,γ) reaction and first results of experiments on the 85Rb(p,γ) and 112Sn(α,γ) reactions are shown.
Partly supported by the DFG (ZI 510/5-1 and INST 216/544-1).
[1] L. Netterdon et al., Nucl. Phys. A 916 (2013) 149