Suppression of the stellar enhancement factor and the reaction 85Rb(p,n)85Sr

Details Suppression of the stellar enhancement factor and the reaction 85Rb(p,n)85Sr Suppression of the stellar enhancement factor and the reaction 85Rb(p,n)85Sr

2009-08-21

arxiv.org/abs/0908.3195v1

Phys.Rev.C80:035801, 2009

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

8 figures, accepted for publication in Physical Review C

Scientific paper

10.1103/PhysRevC.80.035801

It is shown that a Coulomb suppression of the stellar enhancement factor occurs in many endothermic reactions at and far from stability. Contrary to common assumptions, reaction measurements for astrophysics with minimal impact of stellar enhancement should be preferably performed for those reactions instead of their reverses, despite of their negative reaction Q-value. As a demonstration, the cross section of the astrophysically relevant 85Rb(p,n)85Sr reaction has been measured by activation between 2.16<=E_{c.m.}<= 3.96 MeV and the astrophysical reaction rates at p-process temperatures for (p,n) as well as (n,p) are directly inferred from the data. Additionally, our results confirm a previously derived modification of a global optical proton potential. The presented arguments are also relevant for other alpha- and proton-induced reactions in the p-, rp-, and nu-p-processes.

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