Off-shell effects in the energy dependence of the 7Be(p, γ)8B astrophysical S factor

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I show that off-shell effects, like antisymmetrization and 7Be distortions, can significantly influence the energy dependence of the nonresonant 7Be(p, γ)8B astrophysical S factor at higher energies. The proper treatment of these effects results in a virtually flat E1 component of the S factor at Ecm = 0.3 - 1.5 MeV energies in the present eight-body model. The energy dependence of the nonresonant S factor, predicted by the present model, is in agreement with the low-energy radiative capture data and the existing high-energy Coulomb dissociation data. Irrespective of whether or not the present energy dependence is correct, off-shell effects can cause 15-20% changes in the value of S(0) extrapolated from high-energy (Ecm > 0.7 MeV) data.

Original languageEnglish
Pages (from-to)247-252
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number3-4
Publication statusPublished - Feb 27 1997



  • Astrophysical S factor
  • Be(p, γ)B
  • Coulomb dissociation
  • Radiative capture
  • Solar neutrinos

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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