The dual absorptive model is applied to nN backward scattering in detail and through the fits to the available data, the N ( I , = i) and A(Iu = 3) exchange amplitudes are studied. The interaction radius R and the slope parameter B for the N amplitudes are found to be consistent with those of the forward scattering, while the slope parameter B for the A amplitude is found to be rather large. This inconsistency is attributed to the incorrect form of the Re A as given by the model. Possible mechanisms to produce the correct Re A are given.

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