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Astron. Astrophys. 358, L67-L70 (2000)

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Letter to the Editor

The synthesis of the light Mo and Ru isotopes: how now, no need for an exotic solution?

V. Costa 1,2,3, M. Rayet 3, R.A. Zappalà 1 and M. Arnould 3

1 Dipartimento di Fisica e Astronomia dell'Università degli studi di Catania, Italy
2 INFN-LNS, Catania, Italy
3 Université Libre de Bruxelles, Institut d'Astronomie et d'Astrophysique, Belgium

Received 27 March 2000 / Accepted 19 May 2000

Abstract

The most detailed calculations of the p-process call for its development in the O/Ne layers of Type II supernovae. In spite of their overall success in reproducing the solar system content of p-nuclides, they suggest a significant underproduction of the light Mo and Ru isotopes. On grounds of a model for the explosion of a 25 [FORMULA] star with solar metallicity, we demonstrate that this failure might just be related to the uncertainties left in the rate of the [FORMULA] neutron producing reaction. The latter indeed have a direct impact on the distribution of the s-process seeds for the p-process.

Key words: nuclear reactions, nucleosynthesis, abundances – stars: abundances – stars: supernovae: general – solar system: general

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© European Southern Observatory (ESO) 2000

Online publication: June 20, 2000
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