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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Nuclear Astrophysics 4

HK 58.6: Vortrag

Donnerstag, 26. März 2015, 18:15–18:30, K/HS2

Activation measurements of α-induced reactions at sub-Coulomb energies — •Philipp Scholz¹, Anne Endres², Alfred Dewald¹, Stefan Heinze¹, Jan Mayer¹, Claus Müller-Gatermann¹, Lars Netterdon¹, and Andreas Zilges¹ — ¹Institute for Nuclear Physics, University of Cologne — ²Institute for Applied Physics, Goethe University Frankfurt am Main

Network calculations of the γ process rely almost completely on theoretically predicted reaction rates within the scope of the Hauser-Feshbach Statistical Model. Especially the prediction of cross sections for (γ,α)-reactions at energies within or close to the astrophysically relevant energy window remains a problem due to the uncertainties in the underlying α-optical-model potentials. Although experimental values far above the Coulomb-barrier are well reproduced, commonly used α-optical potentials often fail to describe the trend at energies comparable to those at astrophysical sites of the γ process. Improvements of the adopted optical-model potentials are hampered by the lack of experimental cross sections at sub-Coulomb energies. In order to enlarge the experimental data base, cross sections of the ¹⁸⁷Re(α,n) and ¹⁰⁸Cd(α,n) reactions were investigated using the activation technique with the Cologne Clover Counting Setup. Besides recent experimental results, future plans for more sensitive cross-section studies applying Accelerator Mass Spectrometry using CologneAMS will be presented.

Partly supported by the DFG (ZI 510/5-1 and INST 216/544-1) and the ULDETIS project within the UoC Excellence Initiative institutional strategy.