On the application of effective-range theory to the3S1-3D1state of the neutron-proton system

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Abstract
Discusses several definitions of the deuteron effective range rho (- alpha 2, - alpha 2) given in the literature and their connection with the appropriate scattering phases. Relations between the 3S1-3D1 scattering lengths and effective ranges for three parameterisations of the S matrix are obtained. The authors show that a suggested inelastic two-channel S matrix has five rather than six parameters if the physical situation contains only three channels.