Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 52: Nukleare Astrophysik III
HK 52.2: Vortrag
Donnerstag, 24. März 2011, 14:30–14:45, C-2
Activation Measurement of the Reaction 141Pr(α,n)144Pm for the Astrophysical p Process — •Andreas Hennig, Lars Netterdon, Anne Sauerwein, and Andreas Zilges — Institut für Kernphysik, Universität zu Köln
About 30-35 proton-rich nuclei, referred to as the p nuclei, are bypassed by the s and r process [1]. One of the processes assumed to produce the p nuclei is the photodisintegration of heavy seed-nuclei. Since experimental data on the reaction rates involved in this process are very rare, the network calculations are almost completely based on theoretically predicted reaction rates. To improve the nuclear models that enter the theoretical calculations, the reaction 141Pr(α,n)144Pm was studied in an activation experiment at energies inside and just above the Gamow window at the cyclotron facility of the No-dqPhysikalisch-Technische BundesanstaltNo-dq (PTB) in Braunschweig. Since in this energy region the cross section is predominantly sensitive to the α-nucleus optical-model potential, this reaction is well suited to constrain the optical-model potential in this mass region [2]. Preliminary results will be presented.
Supported by the DFG (ZI 510/5-1), by the BMBF under contract 06 KY 9136 and by the Bonn-Cologne Graduate School of Physics and Anstronomy.
[1] M. Arnould and S. Goriely, Phys. Rep. 384 (2003) 1.
[2] A. Sauerwein et al., Prog. Part. Nucl. Phys, in press.