Neutron-proton scattering has been measured from 6 to 61.5° c.m. for neutrons of effective energy 105 ± 3 and 137 + 5 MeV using a liquid hydrogen scatterer and a large neutron counter. The results confirm previous measurements and show a near symmetry around 90° at 105 MeV, and a fairly definite asymmetry at 137 MeV. The ‘Serber force’ does not, therefore, give a good approximation to the experimental data at 137 MeV.
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Thresher et al. (1955) studied this question.
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