Backward Angle Anomaly in Alpha+^<16>O Scattering and Alpha-Cluster States in ^<20>Ne

概要

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The backward angle anomaly (BAA) is investigated at E_α=20〜25 MeV from the view-point of the alpha-cluster structure at high excited energies in ^<20>Ne. The orthogonality condition model is adopted with the use of the interaction potential derived from a two-body potential which has a starting-energy dependence. Both the angular distributions and the excitation function at an extreme back angle are fairly well reproduced by the model. It is revealed that the BAA is caused essentially by the broad resonant surface partial waves which correspond to the well-developed alpha-cluster states at high excited energies in ^<20>Ne. The BAA is considered as an evidence of the persistent existence of the higher nodal 6^+ and 8^+ states of the α+^<16>O cluster which have not been confirmed hitherto. Mechanism of the BAA for the hole nucleus such as ^<15>N is discussed from the viewpoint of the universal existence of the higher nodal states at high excited energy region.
理論物理学刊行会の論文
1977-01-25