We present results of measurements of the n-p total cross section between 30 and 280 GeV/c. The measurements were carried out with a neutron beam by using the standard transmission technique and a liquid-hydrogen target. A total-absorption calorimeter was used to determine the neutron energy. Our measurements, which have an accuracy of {~}1%, indicate a smooth rise of approximately 1.5 mb between 50 and 280 GeV/c. The combined n-p and p-p data above 20 GeV/c are well fitted by the expression σ=38.4+0.85|ln(s/95)|1.47 mb.
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Longo et al. (1974) studied this question.