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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Nukleare Astrophysik

HK 33.1: Group Report

Tuesday, March 5, 2013, 14:00–14:30, HSZ-403

Investigation of charged-particle induced reactions for the nucleosynthesis of p nuclei — •Lars Netterdon, Janis Endres, Jan Mayer, Anne Sauerwein, Philipp Scholz, and Andreas Zilges — Institut für Kernphysik, Universität zu Köln

Up to the current understanding, about 35 proton-rich nuclei are bypassed by the s and r process. They are referred to as p nuclei. Since experimental data are very scarce, the majority of the astrophysical reaction rates is calculated using statistical model calculations. Nuclear physics input parameters entering these calculations, such as optical-model potentials, γ strength functions, and nuclear level densities, have to be constrained experimentally. In this talk, an overview of various experimental results will be given. E.g. the reactions ¹⁴¹Pr(α,n) [1], ¹⁶⁸Yb(α,n), and ¹⁶⁸Yb(α,γ) are presented, that were studied using the activation technique. In addition, results of the in-beam measurement on ⁷⁴Ge(p,γ) [2] are presented. The experimental results are compared to statistical model calculations and their astrophysical impact is discussed. Finally, first results of the reaction ⁸⁹Y(p,γ) are shown, which was measured with the in-beam technique using the high-efficiency HPGe-detector array HORUS. The beam was delivered by the 10 MV tandem accelerator at the Institute for Nuclear Physics in Cologne.
Supported by the DFG (ZI 510/5-1, INST 216/544-1). J.M., A.S., and P.S. are members of the Bonn-Cologne Graduate School of Physics and Astronomy.
[1] A. Sauerwein et al., Phys. Rev. C 84, 045808 (2011)
[2] A. Sauerwein et al., Phys. Rev. C 86, 035802 (2012)