Differential cross section for n-p elastic scattering in the angular region 50deg<th^{*}<180deg at 459 MeV
نویسنده
چکیده
The differential cross section for n-p elastic scattering at 459 MeV in the c.m. angular region 50' & 0* & 180' has been measured with high statistical precision and good relative accuracy. The uncertainty in the absolute normalization (based on the simultaneously measured yield of deuterons from the np ~der reaction) was initially estimated to be -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 phaseshift fit. The pole-extrapolation method of Chew was used to extract the pion-nucleon coupling constant f from the back-angle portion of the data. The value obtained, f'=0.069, is somewhat smaller than the values 0.0735—0.0790 obtained from analyses of pion-nucleon scattering, tending to con5.rm the need for an upward renormalization of the angular distribution by —10%%uo.
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