Elsevier

Nuclear Physics A

Volume 459, Issue 2, 3 November 1986, Pages 374-386
Nuclear Physics A

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

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Abstract

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.

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