Elsevier

Nuclear Physics A

Volume 430, Issue 3, 3 December 1984, Pages 589-604
Nuclear Physics A

A study of the 6Li(π+, pp)4He reaction within the three-body problem

https://doi.org/10.1016/0375-9474(84)90096-4Get rights and content

Abstract

The differential cross section for the 6Li(π+, pp)4He reaction for symmetrical coplanar kinematics has been calculated at the incident pion energy Eπ = 70 MeV within the three-body problem α + 2N taking into account the Pauli exclusion principle in each Nα subsystem. Three-body distortions in the final state have been taken into account in the eikonal approximation. The treatment is based on the superposition of the single-particle and two-particle mechanisms of absorption leading to the rescattering of the π- and ρ-mesons through the Δ-isobar. The analytical character of the adopted wave function for the 6Li nucleus (the multidimensional gaussian basis) makes it possible to ascertain clearly that the reaction amplitude of the type under study is insensitive to short-range NN correlations both in the initial and final states. The calculated momentum distribution of recoil α-particles is in good agreement with the experimental data available, but the experimental accuracy should be improved in order to see the contribution of a specific three-body part of the 6Li wave function orthogonal to the ad channel. Some problems to be solved in future are discussed.

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