Coulomb Suppression of the Stellar Enhancement Factor

Abstract

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.

Suppression of the stellar enhancement factor and the reactionRb85(p,n)SrRauscher1, Kiss2, Gyuerky3 et al. 2009Phys. Rev. CSelf Cite462480View full textAdd to dashboardCite

“…A brief account of our findings was already given in [7]. The present follow-up paper expands the discussion and also provides additional results in all parts of this investigation.…”

High precision113In(α,α)113In elastic scattering at energies near the Coulomb barrie

“…However, by using the detailed balance theorem, information on the photodisintegration cross sections can be obtained from the experimental study of the inverse capture reactions. This approach provides more relevant astrophysical information than the direct study of the γ -induced reactions since often the influence of thermally excited states is smaller in this direction, compared to photon-induced reactions [16,[22][23][24]. In recent years several α-capture cross sections have been measured using the well known activation technique [25][26][27][28][29][30][31][32][33], and the results were compared with the H-F predictions.…”

Cross-section measurement of theBa130(p,γ)La131reaction forNetterdon1, Endres2, Kiss3 et al. 2014Phys. Rev. CSelf Cite250260View full textAdd to dashboardCite

“…[38,39] was tested on the 130 Ba(p,γ ) reaction. This modification improved the reproduction of measured proton-induced reaction cross sections for lighter nuclei [40][41][42]. However, for the present case this modified proton+nucleus OMP leads to very similar cross-section values as the unmodified version.…”