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Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 28: Nuclear Astrophysics

HK 28.5: Talk

Tuesday, March 17, 2009, 15:30–15:45, H-ZO 60

Photodisintegration of p-process nuclei — •A. Wagner1, C. Nair1, M. Erhard1, D. Bemmerer1, R. Beyer1, E. Grosse1,2, A. Junghans1, K. Kosev1, G. Rusev1, K.D. Schilling1, and R. Schwengner11Forschungszentrum Dresden-Rossendorf, 01314 Dresden — 2Technische Universität Dresden, 01062 Dresden

The neutron deficient p-nuclei are shielded from the s- or r-process by stable isotopes. P-nuclei are likely to be formed in high temperature cosmic scenarios like exploding supernovae by photodisintegration reactions on heavy r- or s- seed nuclei. The lack of experimental information on energy-dependent cross sections especially for (γ,p) and (γ,α) reactions reduces the applicability of nucleosynthesis models. Using intense bremsstrahlung produced at the superconducting electron linear accelereator ELBE at Forschungszentrum Dresden-Rossendorf we investigated (γ,n), (γ,p) and (γ,α) reactions for the medium-mass p-nuclei 92Mo and 144Sm, as well as (γ,n) reactions for 100Mo and 154Sm by photo-activation. The lowest photoactivation yields have been measured in an underground laboratory. The photodisintegration of 197Au serves as a benchmark and it is compared to data measured previously with the positron annihilation technique.

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