Atomic effects in astrophysical nuclear reactions

Abstract

Two models are presented for the description of the electron screening effects that appear in laboratory nuclear reactions at astrophysical energies. The two-electron screening energy of the first model agrees very well with the recent LUNA experimental result for the break-up reaction , which so far defies all available theoretical models. Moreover, multi-electron effects that enhance laboratory reactions of the CNO cycle and other advanced nuclear burning stages, are also studied by means of the Thomas-Fermi model, deriving analytical formulae that establish a lower and upper limit for the associated screening energy. The results of the second model, which show a very satisfactory compatibility with the adiabatic approximation ones, are expected to be particularly useful in future experiments for a more accurate determination of the CNO astrophysical factors.

14 RevTex pages + 2 ps (revised) figures. Phys.Rev.C (in production)

References in corpus (2)

• Non-linear screening corrections of stellar nuclear reaction rates and their effects on solar neutrino fluxes
• Screened Coulomb potentials for astrophysical nuclear fusion reactions

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• Screening enhancement factors for laboratory CNO and rp astrophysical reactions