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Critical examination and analysis of existing n-p scattering data below 20 Mev reveals that they provide quantitative information only about the S-wave scattering lengths and effective ranges, which are found to be at = 5.396 + 0.011 F; a = -23.678 t 0.028 F; S rt = 1.726 5 0.014 F; rs = 2.51 t 0.11 k 0.043 F where the second error quoted for r is a conservative estimate of the S uncertainty due to departures from the shape-independent approximation. The correlations in error are <&at&as>=doi:10.1103/physrev.130.2025 fatcat:wwjzh2xo4fc2vpzrizjjowa7iq