Energy dependence of fusion cross sections

Abstract

Observed enhancements of fusion cross sections at low energies are explained as caused by an underestimate of beam energy due to an overestimate of the stopping energy loss.

Theory of the Coulomb Dissociation

“…[67], for important GT transitions whose strength are a small fraction of the sum rule the direct relationship between σ (p, n) and B(GT ) values also fails to exist. Similar discrepancies have been observed [68] for reactions on some odd-A nuclei including 13 C, 15 N, 35 Cl, and 39 K and for charge-exchange induced by heavy ions [66,69]. Undoubtedly, charge-exchange reactions such as (p,n), ( 3 He,t) and heavy-ion reactions (A,A±1) can provide information on the B(F) and B(GT ) values needed for astrophysical purposes [70].…”

Small effects in astrophysical fusion reactions

“…As suggested in ref. [11], this effect might well be due to a wrong assumption on the dependence of the stopping power on the beam energy.…”

Solar fusion cross sections

“…To a good approximation, atomic-target data can be corrected for electron screening effects within the adiabatic limit (Shoppa et al, 1993) in which the screening energy U e is simply given by the difference in electronic binding energy of the united atom and the sum of the projectile and target atoms. It now appears that electron screening effects for atomic targets can be modeled reasonably well Bang et al, 1996; see also Junker et al, 1998). This conclusion must be demonstrated for molecular and solid targets.…”