In the WKB approximation, we provide general expressions for the vacuum polarization correction to the penetrability factor for nuclear reactions at energies below the Coulomb barrier. We analyse some specific cases: (a) the reactions of the p-p cycle in the Sun, with particular attention to the p + p --> d + e+ + nu(e) cross section and to the influence on the calculation of solar neutrino fluxes. (b) The C-12 + C-12 and O-16 + O-16 reactions, especially concerning the extraction of the astrophysical S-factor at zero energy from experimental data. (c) Heavy ion fusion reactions (e.g. 64Ni + 64Ni), which are of intrinsic interest from the nuclear physics point of view, and which have been measured down to relatively low energies.
|Autori interni:||DEGL'INNOCENTI, SCILLA|
|Autori:||DEGL'INNOCENTI S; FIORENTINI G|
|Titolo:||VACUUM POLARIZATION AND NUCLEAR-REACTIONS AT ENERGIES OF ASTROPHYSICAL INTEREST|
|Anno del prodotto:||1994|
|Appare nelle tipologie:||1.1 Articolo in rivista|