Physics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983phrvd..27.2041e&link_type=abstract
Physical Review D (Particles and Fields), Volume 27, Issue 9, 1 May 1983, pp.2041-2055
Physics
4
Scientific paper
A transition-radiation (TR) detector, consisting of 24 modules of styrofoam radiators and multiwire proportional chambers, and an ionization calorimeter have been used to measure the pion-to-proton ratio among the unaccompanied cosmic-ray hadrons at a mountain altitude of 730 g cm-2. Using the characteristics of the TR detector obtained from calibrations with particle beams at accelerators, the πp ratio has been determined for cosmic-ray hadrons as πp=0.96+/-0.15 for hadron energy = 400-800 GeV, and πp=0.45+/-0.25 for energy > 800 GeV. Monte Carlo simulations of hadron cascades in the atmosphere using the approximate criterion of unaccompaniment suggest that the observed πp ratio as well as the previously reported neutral-to-charge ratio can be understood by assuming a value of about 13 for the charge exchange in nucleon-air-nucleus inelastic interactions at energies above 400 GeV.
Ellsworth R. W.
Ito A. S.
MacFall J. R.
Siohan F.
Streitmatter Robert E.
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