The neutron-proton differential cross section at 50.0 MeV has been measured to a precision of ≃ 2% for backward-hemisphere c.m. angles and ≃ 3% for forward angles, both relative. The present data are not in good agreement with the previous n−p measurements near this energy. A preliminary phase-shift analysis using the present data produces more satisfactory results, particularly for the P11 phase shift.
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