(n,$γ$) Cross Sections of Light p Nuclei -- Towards an Updated Database for the p Process

Details (n,$γ$) Cross Sections of Light p Nuclei -- Towards an Updated Database for the p Process (n,$γ$) Cross Sections of Light p Nuclei -- Towards an Updated Database for the p Process

2008-05-30

arxiv.org/abs/0805.4755v1

Eur.Phys.J.A27:129,2006

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure Proceeding "Nuclear Physics in Astrophysics- NPA-II", Debrecen/ Hungary (2005)

Scientific paper

10.1140/epja/i2006-08-018-5

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,$\gamma$) activation measurements on p nuclei, 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. 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 $^{74}$Se, $^{84}$Sr, $^{120}$Te and $^{132}$Ba, and an improved value for $^{130}$Ba. In all cases we find perfect agreement with the recommended MACS predictions from the Bao et al. compilation.

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