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Gießen 2007 – scientific programme

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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 astrophysicsD — •Andreas Wagner1, Nadia Benouaret1,2, Roland Beyer1, Friedrich Dönau1, Martin Erhard1, Eckart Grosse1,3, Arnd Junghans1, Krasimir Kosev1, Chithra Nair1, Gencho Rusev1, Klaus-Dieter Schilling1, and Ronald Schwengner11Institut 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.

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