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Interpretation of the angular distribution of the 4He( pi -,n)3H reaction based on the Delta -hole model.

The angular distribution and the magnitude of the cross section of the /sup 4/He(..pi../sup -/,n)/sup 3/H reaction for pion kinetic energies from 100 to 250 MeV are reasonably well reproduced in the framework of the ..delta..-hole model with an improved overlap function . It is pointed out that the ..delta..-hole formation dominates the reaction in the forward region while the one nucleon mechanism becomes more important at larger angles.