Coulomb Suppression of the Stellar Enhancement Factor

Journal Article · Fri Nov 07 04:00:00 EST 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.101.191101· OSTI ID:21179883

Kiss, G G; Gyuerky, Gy; Simon, A; Fueloep, Zs; Somorjai, E ^[1]; Rauscher, T ^[2]

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1. Institute of Nuclear Research (ATOMKI), H-4001 Debrecen, POB.51. (Hungary)
2. Department of Physics, University of Basel, CH-4056 Basel (Switzerland)

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 {sup 85}Rb(p,n){sup 85}Sr reaction has been measured by activation between 2.16{<=}E{sub c.m.}{<=}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.

• OSTI ID: 21179883
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 19 Vol. 101; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ASTROPHYSICS
CHARGED PARTICLES
CROSS SECTIONS
MEV RANGE 01-10
NEUTRONS
PROTON REACTIONS
PROTONS
Q-VALUE
REACTION KINETICS
RUBIDIUM 85 TARGET
STRONTIUM 85