We measured the differential cross section for 12.4-GeV/c proton-proton inelastic scattering on circles of fixed energy loss in the cm. system. We varied the inelasticity from 8 to 94% and covered much of the angular range. For essentially all inelasticities the dependence on Pj^ is approximately e"^^-^ . The absolute value of (fu/dQdp also depends only weakly on energy loss.
We have tested the feasibility of measuring the ratio of proton-neutron to proton-proton elastic scattering using the second extracted proton beam of the Argonne ZGS and a liquid-deuterium target. The_formard proton was detected by a 35-m-long spectrometer consisting of magnets and scintillation and Cerenkov counters. The recoil nucleon was detected by a steel-scintillator sandwich counter. The efficiency of this counter was measured using tagged neutrons in coincidence with the spectrometer and calculated using a Monte Carlo simulation of the nuclear cascade. A scintillation counter determined whether the recoil nucleon was charged or neutral. At a test point of po=12.4 GeV/c, 8*=37', and t = -2.2 (GeV/c)2, we found a pn-to-pp cross-section ratio of 1 05+0.14. The pp cross section was (du/dQ), , =5.8&0.6 pb/sr, and the pn cross section was (du/dQ),, =6.1+1 &/sr. The ratio of pp scattering from deuterium to pp scattering from hydrogen, corrected for geometrical effects, was 0.753~0.09. We discuss the future of this technique for measuring pn cross sections and compare the results of the test with the predictions of the Glauber multiple-scattering forn~alisn~. Lye also plot available pn data as a function of 0, ,,zp,z.
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