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APS/123-QED Experimental (n,γ) cross sections of the p-process nuclei

By Se, I. Dillmann, M. Heil, T. Rauscher and F. -k. Thielemann

Abstract

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 are 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,γ) activation measurements, related by detailed balance to the respective photodisintegrations, were carried out at the Karlsruhe Van de Graaff accelerator using the 7 Li(p,n) 7 Be source for simulating a Maxwellian neutron distribution of kT = 25 keV. First results for the experimental (n,γ) cross sections of the light p nuclei 74 Se and 84 Sr are reported. These experimental values were used for an extrapolation to the Maxwellian averaged cross section at 30 keV, <σ>30, yielding 271±15 mb for 74 Se, and 300±17 mb for the total capture cross section of 84 Sr. The partial cross section to the isomer in 85 Sr was found to be 190±10 mb. PACS numbers: 25.40.Lw, 26.30.+k, 27.50.+e, 97.10.Cv I

Year: 2008
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