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PROTONS MOMENTA LIE IN LAB BACKWARD HEMISPHERE.
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Attenuation measurements of reaction and total cross sections have been made for π− beams at 410, 464, and 492 MeV on targets of CD2, 6Li, C, Al, S, Ca, Cu, Zr, Sn, and Pb. These results are assisted by and compared to predictions from a recent eikonal optical model. Calculations with this model, which does not include pion absorption, agree with recent elastic scattering data, but are significantly below our measured reaction and total cross sections.
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Total cross sections for Sigma- and pi- on beryllium, carbon, polyethylene and copper as well as total cross sections for protons on beryllium and carbon have been measured in a broad momentum range around 600GeV/c. These measurements were performed with a transmission technique adapted to the SELEX hyperon-beam experiment at Fermilab. We report on results obtained for hadron-nucleus cross sections and on results for sigma_tot(Sigma- N) and sigma_tot(pi- N), which were deduced from nuclear cross sections.
Results for nuclear total cross sections.
Average total cross sections for nucleon targets deduced from the nuclear target data, at the average beam momentum.
The total cross sections of 4 He, 6 Li, 7 Li, 9 Be, 12 C and 32 S for positive and negative pions have been measured in the energy range 80 to 260 MeV in a transmission experiment. Coulomb corrections were applied using real parts of the forward nuclear amplitudes as determined from dispersion relations. At the lower energies there remain large residual differences between the π + and π − scattering on the isoscalar nuclei. These can be largely understood in terms of the Coulomb distortion.
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Interacting beam cross-section.
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DATA FOR EVENTS WITHOUT PARTICLES WITH PT > .8 GEV.
DATA FOR EVENTS WITH ONE PARTICLE WITH PT > .8 GEV.
DATA FOR EVENTS WITH TWO OR MORE PARTICLES WITH PT > .8 GEV.
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INTERACTION WITH QUAZI FREE NUCLEONS ARE REJECTED.
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