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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Hauptvorträge

HK 57.2: Invited Talk

Friday, March 16, 2007, 11:30–12:00, A

Experiments with real photons for nuclear astrophysics^D — •Andreas Wagner¹, Nadia Benouaret^1,2, Roland Beyer¹, Friedrich Dönau¹, Martin Erhard¹, Eckart Grosse^1,3, Arnd Junghans¹, Krasimir Kosev¹, Chithra Nair¹, Gencho Rusev¹, Klaus-Dieter Schilling¹, and Ronald Schwengner¹ — ¹Institut für Strahlenphysik, Forschungszentrum Dresden-Rossendorf, 01314 Dresden — ²Univ. d’ Alger, 16111 Alger, Algerie — ³Institut für Kern-und Teilchenphysik, Tech. Univ. Dresden, 01062 Dresden

Explosive stages in the evolution of massive stars lead to temperatures which cause photon-induced disintegration of nuclei producing e.g. the so-called p-process nuclei and possibly modifying the r-process path. In order to obtain a detailed understanding of those processes an experimental program using intense bremsstrahlung has been initiated at the new superconducting electron accelerator ELBE at the Forschungszentrum Dresden-Rossendorf. For the first time the smooth transition from photon scattering to photo-disintegration has been investigated in detail experimentally for the chain of all stable even-even molybdenum isotopes, the N=50 closed shell nuclei ⁸⁸Sr, ⁸⁹Y, ⁹⁰Zr, and the p-process nucleus ¹⁴⁴Sm. The influence of the tail of the giant dipole resonance at energies well below 10 MeV and (γ,p)− and (γ,α)−reactions are discussed leading to important consequences on cosmic element production in sufficiently hot environments.

^DSupported by the Deutsche Forschungsgemeinschaft under contract Do 466/1-2.