We have measured total cross sections for neutrons on protons, deuterium, beryllium, carbon, aluminum, iron, copper, cadmium, tungsten, lead, and uranium for momenta between 30 and 300 GeV/c. The measurements were carried out in a small-angle neutral beam at Fermilab. Typical accuracy of the data is 0.5 to 1%. The cross sections are consistent with an A 0"77+0"01 dependence over the entire momentum range. The cross sections are compared with theoretical predictions. Agreement is found only if inelastic screening is included. Nuclear radii obtained from our data are in good agreement with previous determinations. oT(Pn) would have been 0.9 mb larger. ** See, for example, Pumplin and Ross [27].

The 300 ton cosmic ray spectrograph (MARS) has been used to measure the vertical momentum spectrum of cosmic ray muons in the momentum range 20-500GeVlc at sea level. The differential spectrum is well represented by the logarithmic polyi:omial p 3 N~) == -0.524-iO.366 (Inp)--0.0445 (lnp)z+OGOOS (InpI3

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We have measured neutron-proton elastic scattering cross sections for four-momentum transfers .17 ~-t ~ 3.5(Gev/c)2. The logarithmic slope parameter is found to be consistent with existing proton-proton parameterizations. The data also exhibit a dip in the cross section near-t ~ l.4(Gev/c)2 for incident neutron momenta above 200 GeV/c. Differences between n-p and p-p cross sections. 2 are noted in the region .7 ~-t ~ l.4(GeV/c) •

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