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Atomic effects in astrophysical nuclear reactions
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Atomic effects in astrophysical nuclear reactions
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Paper
Atomic effects in astrophysical nuclear reactions
2001
Overview
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 \\(% He3(He3,2p)He^{4}\\), 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.
Publisher
Cornell University Library, arXiv.org
