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HK: Fachverband Hadronen und Kerne

HK 28: Nuclear Astrophysics

HK 28.5: Vortrag

Dienstag, 17. März 2009, 15:30–15:45, H-ZO 60

Photodisintegration of p-process nuclei — •A. Wagner¹, C. Nair¹, M. Erhard¹, D. Bemmerer¹, R. Beyer¹, E. Grosse^1,2, A. Junghans¹, K. Kosev¹, G. Rusev¹, K.D. Schilling¹, and R. Schwengner¹ — ¹Forschungszentrum 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.