An approximate Bethe-Salpeter equation is used to calculate the N-N phase parameters. The one-boson-exchange (OBE) hypothesis is invoked to approximate the left-hand singularity. A good fit to the existing data is obtained, and certain phase parameters (³D₂, ¹D₂, and ³P₂), which are not fitted well by existing OBE-potential (OBEP) models, are much improved. The observables are not fitted directly, but rather an approximate procedure suggested by MacGregor et al. is used to minimize the experimental χ². Comparisons are made with the nonrelativistic OBEP used in conjunction with the Schr\"odinger equation.
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Gersten et al. (1971) studied this question.
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