# (n,γ) cross-sections of light p nuclei

Dillmann, I. and Heil, M. and Kaeppeler, F. and Plag, R. and Rauscher, T. and Thielemann, F. -K.. (2006) (n,γ) cross-sections of light p nuclei. In: The 2nd International Conference on Nuclear Physics in Astrophysics. Berlin, Heidelberg, pp. 129-134.

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Official URL: http://edoc.unibas.ch/dok/A5253944

The nucleosynthesis of elements beyond iron is dominated by the S and r processes. However, a small amount of stable isotopes on the proton-rich side cannot be made by neutron capture and is thought to be produced by photodisintegration reactions on existing seed nuclei in the so-called p process. So far most of the p-process reactions are not yet accessible by experimental techniques and have to be inferred from statistical Hauser-Feshbach model calculations. The parametrization of these models has to be constrained by measurements on stable proton-rich nuclei. A series of (n, gamma) activation measurements on p nuclei, related by detailed balance to the. respective photodisintegrations, was carried out at the Karlsruhe Van de Graaff accelerator using the Li-7 (p, n) Be-7 source for simulating a Maxwellian neutron distribution of kT = 25 keV. We present here preliminary results of our extended measuring program in the mass range between A = 74 and A = 132, including first experimental (n, gamma) cross-sections of Se-71, Sr-84, Te-120 and Ba-132, and an improved value for Ba-130. In all cases we find perfect agreement with the recommended MACS predictions from the Bao et al. compilation.