Based on an analysis of the extensive air shower data accumulated over the last ten years at Akeno Cosmic Ray Observatory, the value of the proton-air nuclei inelastic cross section (σinp−air) has been determined assuming the validity of quasi-Feynman scaling of particle production in the fragmentation region. The energy dependence of σinp−air can be represented as 290(E/1 TeV)0.052 mb in the energy interval 1016.2–1017.6 eV, where E is the incident proton energy. The total p-p cross section (σtotp−p), derived using the nuclear distribution function obtained from the shell model, increases with energy as 38.5+1.37 ln2(√s /10 GeV) mb.
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Best fit to data gives SIG(PP) = 38.5 + 1.37*LN(SQRT(S)/10 GeV)**2.
It is shown that in interactions of protons at 200, 300, and 400 GeV, and negative pions at 300 GeV with emulsion nuclei, the scaling of the multiplicity of relativistic charged secondaries is valid and described by a linear function of the scaling variable, z.
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Reaction cross sections for 65.5 MeV protons have been measured for 9 Be, 12 C, 16 O, 28 Si, 40 Ca, 58,60 Ni, 112.116.118.120.124 Sn, and 208 Pb. The results are compared with optical model predictions using relativistic global potentials.
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