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The 17F(p,γ)18Ne reaction at stellar energies

par Dufour, Marianne ;Descouvemont, Pierre
Référence Nuclear physics. A, 730, 3-4, page (316-328)
Publication Publié, 2004

Article révisé par les pairs

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Résumé :

The 17F( p,γ)18Ne radiative capture reaction is investigated with a two-cluster generator-coordinate method. A multi-channel description of the 18Ne wave functions as a superposition of the 17F+p and 14O+α channels is used. The 17F and 14O wave functions are defined in the shell model involving s, p and sd orbitals. The model provides a good overall description of the 18Ne spectroscopy at energies typical of nova and x-ray burst processes. In particular, the 3+1 state, an s-wave resonance dominating the reaction rate at temperatures above 5×108 K, is well described. We find a proton width Γp=21.1 keV, in good agreement with the experimental value Γp=18.0±2stat ±1sys keV. Its gamma width, unknown experimentally, is Γγ=33 meV, similar to values deduced from the shell model, and used in astrophysics (Γγ= 30±20 meV). The non-resonant (E1) as well as the resonant contributions (M1,E2) of the astrophysical S-factor are determined. At zero energy we find S(0)=3.5 keV-b. The corresponding 17F( p,γ)18Ne reaction rate is calculated, and compared with previous approaches. © 2003 Elsevier B.V. All rights reserved.