Abstract
The total cross section of protons for neutrons of mean energy 2535 keV was measured to be 2536 \ifmmode\pm\else\textpm\fi{} 4 mb. This measurement is the average of determinations with five different hydrocarbon samples. Special care was taken to measure neutron energy accurately throughout the experiment and to keep corrections for background and inscattering very small. The singlet effective range deduced from this measurement is 2.78 \ifmmode\pm\else\textpm\fi{} 0.07 fm and is consistent with values deduced from proton-proton scattering under the assumption of charge independence of nuclear forces.
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