par Descouvemont, Pierre
Référence Nuclear physics. A, 584, 3, page (532-546)
Publication Publié, 1995
Article révisé par les pairs
Résumé : The 7Be(α, γ)11C and 7Li(α, γ)11B reactions are investigated in the three-cluster Generator Coordinate Method. The microscopic wave functions are described from α and 3He (3H) clusters, with two coupling modes: α+7Be (7Li) and 3He (3H)+8Be. Different internal states of 7Be (7Li) and 8Be are taken into account. The model is tested on 11C and 11B spectroscopic properties, which agree fairly well with experiment. We suggest that, in both nuclei, the 3 2- and 5 2- states located close to the α+7Be (7Li) threshold, are intruder states. The 7Be(α, γ)11C and 7Li(α, γ)11B reaction rates are calculated for temperatures up to 109 K. A strong enhancement is found with respect to the reaction rates currently used in astrophysical calculations. © 1995.