S13−3D1effective-range parameters of some realistic nucleon-nucleon potentials
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We consider the $P$- and $Q$-shape parameters in the eigenphase and `bar'
phase shift representations for the two Reid potentials and the more recent
Moscow potential. The values of these parameters were obtained from integrals
of the zero-energy wave function in a similar manner to that for the effective
range. Such expressions for the shape parameters yield more reliable numerical
values of the shape parameter than those obtained by least-mean-square or
polynomial fits. We show that the eigenphase representation is more meaningful
than the `bar' phase shift representation and that the variation in the values
of $P_\alpha$ in the models may be of significance.
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