Hadron-iron inelastic cross sections from 100 GEV to 2000 GEV and the composition of the cosmic ray flux at 2900 meters

Computer Science

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Calorimeters, Cosmic Rays, Hadrons, Heat Flux, Inelastic Scattering, Iron, Radar Cross Sections, Radiation Detectors

Scientific paper

An experiment performed to study the interactions of unaccompanied cosmic ray hadrons in an iron calorimeter at an altitude of 2900 meters was described near Sunspot, New Mexico. Wide-gap optical spark chambers in the calorimeter determined, for each event, the depth interval of iron in which the first interaction occurred. The distribution of first interaction depth was used to determine the hadron-iron inelastic cross section for energies, as measured by the calorimeter, from 100 Gev to 2000 Gev. The cross section was observed to rise from (677 + or - 25)mb at 134 Gev to (798 + or - 19)mb at 1270 Gev. The charged-pion-to-proton ratio of the incident flux of hadrons unaccompanied over 3.3 sq m with energies between 400 Gev and 2000 Gev was measured using a transition radiation detector.

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