Differential Cross-Section for N-P Elastic-Scattering in the Angular Region 50-Degrees-Less-Than-Theta-Asterisk-Less-Than-180-Degrees at 459-Mev
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The differential cross section for n-p elastic scattering at 459 MeV in the c.m. angular region 50-degrees dpi0 reaction) was initially estimated to be approximately 7%. The results agree well with back-angle data obtained independently at LAMPF but less well with results from Saclay and the Princeton-Pennsylvania Accelerator and, except for a normalization difference of 10%, are fairly well represented by a phase-shift fit. The pole-extrapolation method of Chew was used to extract the pion-nucleon coupling constant f2 from the back-angle portion of the data. The value obtained, f2=0.069, is somewhat smaller than the values 0.0735-0.0790 obtained from analyses of pion-nucleon scattering, tending to confirm the need for an upward renormalization of the angular distribution by approximately 10%.