Pion-to-proton ratio for unaccompanied high-energy cosmic-ray hadrons at mountain altitude using transition-radiation detector
Journal Article
·
· Phys. Rev. D; (United States)
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/sup -2/. Using the characteristics of the TR detector obtained from calibrations with particle beams at accelerators, the ..pi../p ratio has been determined for cosmic-ray hadrons as ..pi../p = 0.96 +- 0.15 for hadron energy = 400--800 GeV, and ..pi../p = 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 ..pi../p ratio as well as the previously reported neutral-to-charge ratio can be understood by assuming a value of about (1/3) for the charge exchange in nucleon--air-nucleus inelastic interactions at energies above 400 GeV.
- Research Organization:
- Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742
- OSTI ID:
- 5925770
- Journal Information:
- Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 27:9; ISSN PRVDA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640101* -- Astrophysics & Cosmology-- Cosmic Radiation
640104 -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARYONS
BASIC INTERACTIONS
BOSONS
CHARGE-EXCHANGE INTERACTIONS
COSMIC PIONS
COSMIC PROTONS
COSMIC RADIATION
COSMIC RAY DETECTION
COSMIC RAY FLUX
DETECTION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 100-1000
HADRONS
INELASTIC SCATTERING
INTERACTIONS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MEASURING METHODS
MESONS
MONTE CARLO METHOD
MULTIWIRE PROPORTIONAL CHAMBERS
NUCLEONS
PIONS
PROPORTIONAL COUNTERS
PROTONS
PSEUDOSCALAR MESONS
RADIATION DETECTION
RADIATION DETECTORS
RADIATION FLUX
RADIATIONS
SCATTERING
SHOWER COUNTERS
STRONG INTERACTIONS
TRANSITION RADIATION DETECTORS
640104 -- Astrophysics & Cosmology-- Solar Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BARYONS
BASIC INTERACTIONS
BOSONS
CHARGE-EXCHANGE INTERACTIONS
COSMIC PIONS
COSMIC PROTONS
COSMIC RADIATION
COSMIC RAY DETECTION
COSMIC RAY FLUX
DETECTION
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 100-1000
HADRONS
INELASTIC SCATTERING
INTERACTIONS
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MEASURING METHODS
MESONS
MONTE CARLO METHOD
MULTIWIRE PROPORTIONAL CHAMBERS
NUCLEONS
PIONS
PROPORTIONAL COUNTERS
PROTONS
PSEUDOSCALAR MESONS
RADIATION DETECTION
RADIATION DETECTORS
RADIATION FLUX
RADIATIONS
SCATTERING
SHOWER COUNTERS
STRONG INTERACTIONS
TRANSITION RADIATION DETECTORS