• DOI:10.1103/PhysRevLett.101.191101
• Corpus ID: 188238

Coulomb suppression of the stellar enhancement factor.

@article{Kiss2008CoulombSO,
  title={Coulomb suppression of the stellar enhancement factor.},
  author={G{\'a}bor Gyula Kiss and Thomas Rauscher and Gy. Gy{\"u}rky and A. Simon and Zs. F{\"u}l{\"o}p and E. Somorjai},
  journal={Physical review letters},
  year={2008},
  volume={101 19},
  pages={
          191101
        }
}

• G. Kiss, T. Rauscher, +3 authors E. Somorjai
• Published 16 September 2008
• Physics
• Physical review letters

It is commonly assumed that reaction measurements for astrophysics should be preferably performed in the direction of a positive Q value to minimize the impact of the stellar enhancement factor, i.e., the difference between the laboratory rate and the actual stellar rate. We show that the stellar effects can be minimized in the charged particle channel, even when the reaction Q value is negative. As a demonstration, the cross section of the astrophysically relevant 85Rb(p,n)85Sr reaction has been measured by activation between 2.16 < or = Ec.m. < or = 3.96 MeV and the astrophysical reaction rate for (p, n) as well as (n, p) is directly inferred from the data. The presented arguments are also relevant for other alpha- and proton-induced reactions in the p and rp processes. Additionally, our results confirm a previously derived modification of a global optical proton potential.