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C12(02+)+α molecular states in a microscopic four α model

par Dufour, Marianne;Descouvemont, Pierre
Référence Nuclear physics. A, 927, page (134-146)
Publication Publié, 2014

Article révisé par les pairs

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Résumé :

The 16O nucleus is investigated within a C12+α four α multicluster model. The generator coordinate method combined with the microscopic R-matrix method is used to determine bound and resonant states. The 12C nucleus is described by 3 α clusters located at the apexes of isosceles triangles. We optimize the generator coordinates to get a reasonable description of the 02+-01+ energy gap, where the 02+ is the so-called Hoyle state, considered as a 3 α state. Our calculations mainly focus on resonances located near the C12(02+)+α threshold. We emphasize the difficulty to interpret broad resonant states and we show that bound state approximation methods are not well adapted in the context of our study. An R-matrix analysis suggests the existence of 0 +, 2 + and 4 + molecular states which present a significant C12(02+)+α structure, and which may form a rotational band. © 2014 Elsevier B.V.