Be^9 (α, 2α) He^5 Reaction and Alpha-Particle Model for Be^9

概要

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Quasi-free α-α knock-out collisions in Be^9 are investigated by using the α-particle model, in order to test further the validity of the α-cluster picture in Be^9 and to clarify the reaction mechanism in terms of well-established α-α and n-α potentials. The α-particle model wave function of Be^9 is constructed on the basis of the above potentials and the exclusion principle procedure. Quasi-free α-α scattering is treated in the impulse approximation. Off-the-energy shell effects are completely calculated. The effects of the broad resonant state of He^5 are also taken into account in terms of the final state n-α interaction. These features and the admixture of the excited states of the Be^8-core determine the angular correlation of the reaction products. The theory succeeds in explaining satisfactorily both the shape and the magnitude of the experimental angular correlation distribution at incident energies 30~40 MeV. It is suggested that the experimental data at about 23 MeV are of particular interest. It is noted that these results are derived only from the actual nuclear forces and do not involve any free parameters.
理論物理学刊行会の論文
1966-11-25