München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 31: Kern- und Teilchen-Astrophysik

HK 31.2: Gruppenbericht

Mittwoch, 22. März 2006, 14:30–15:00, E

Electromagnetic Excitations in Nuclei: From Photon Scattering to Photo-dissociation^* — •R. Beyer¹, F. Dönau¹, M. Erhard¹, E. Grosse^1,2, A. R. Junghans¹, K. Kosev¹, C. Nair¹, N. Nankov¹, G. Rusev¹, K.-D. Schilling¹, R. Schwengner¹, and A. Wagner¹ — ¹Inst. für Kern- und Hadronenphysik, FZ Rossendorf, PF 510119, 01314 Dresden — ²Inst. für Kern- und Teilchenphysik, TU Dresden, 01062 Dresden

The synthesis of chemical elements by nuclear transformation processes in high temperature cosmic environments plays a key role for the observed abundances of isotopes in the solar system. In order to understand the details of element production and element disruption we started an experimental program at the new bremsstrahlung facility [1] of the superconducting electron accelerator ELBE. The experimental setup is designed such that the scattering of photons from nuclei and the dissociation of nuclei by photons can be studied around the particle separation energies under optimized background conditions. Photon scattering experiments on ^92,98,100Mo, ⁸⁸Sr, ⁸⁹Y, and ⁹⁰Zr will be shown and compared to calculations based on a random-phase approximation method for deformed nuclei. Photo-dissociation has been studied in (γ,p), (γ,n) and (γ,α) reactions on ^92,100Mo and the results are compared to values used in recent astrophysical network calculations [3,4]. ^*Work supported by Deutsche Forschungsgemeinschaft under contract Do 466/1-2. [1] R. Schwengner, et al., NIM A 555 (2005) 211; [2] F. Dönau, Phys. Rev. Lett. 94 (2005) 092503; [3] M. Arnould and S. Goriely, Phys. Rep. 382 (2003) 1; [4] T. Rauscher, F.-K. Thielemann, ADNDT 88 (2004) 1