• Citer

Microscopic investigation of electric dipole transitions in the α + 16O system

par Descouvemont, Pierre ;Baye, Daniel Jean
Référence Nuclear physics. A, 459, 2, page (374-386)
Publication Publié, 1986

Article révisé par les pairs

• Accès en ligne
• Détails
• Contenu
• Statistiques

Résumé :

A microscopic calculation of forbidden E1 transitions is presented in the framework of the generator coordinate method. Isovector and isoscalar origins of E1 transitions are studied in the case of the α + 16O system. Two-cluster T = 0 and T = 1 configurations are coupled by the exact microscopic Coulomb interaction. The γ- widths of the 11 - and 32 -, states of 20Ne are fairly reproduced by the model but the anomalous branching ratios observed experimentally remain unexplained. Simplified formulas for the isospin-mixing rates and reduced E1 transition probabilities are compared with the microscopic results and are employed to discuss them. The non-resonant E1 contribution to the 16O(α, γ)20Ne reaction is shown to be almost negligible at astrophysical energies. © 1986.