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[en] The balloon-borne isotope matter-antimatter experiment (IMAX) was flown from Lynn Lake, Manitoba Canada on 16 endash 17 July 1992. Using velocity and magnetic rigidity to determine mass, we have directly measured the abundances of cosmic ray antiprotons and protons in the energy range from 0.25 to 3.2 GeV. Both the absolute flux of antiprotons and the antiproton/proton ratio are consistent with recent theoretical work in which antiprotons are produced as secondary products of cosmic ray interactions with the interstellar medium. This consistency implies a lower limit to the antiproton lifetime of ∼107 yr. copyright 1996 The American Physical Society
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[en] The rare isotopes 2H and 3He in cosmic rays are believed to originate mainly from the interaction of high energy protons and helium with the galactic interstellar medium. The unique propagation history of these rare isotopes provides important constraints on galactic cosmic ray source spectra and on models for their propagation within the Galaxy. Hydrogen and helium isotopes were measured with the balloon-borne experiment, IMAX, which flew from Lynn Lake, Manitoba in 1992. The energy spectrum of deuterium between 0.5 and 3.2 GeV/nucleon measured by the IMAX experiment as well as previously published results of 3He from the same instrument will be compared with predictions of cosmic ray galactic propagation models. The observed composition of the light isotopes is found to be generally consistent with the predictions of the standard Leaky Box Model derived to fit observations of heavier nuclei
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ACE 2000: Symposium on acceleration and transport of energetic particles observed in the heliosphere; Indian Wells, CA (United States); 5-8 Jan 2000; (c) 2000 American Institute of Physics.; Country of input: International Atomic Energy Agency (IAEA)
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AIRCRAFT, BARYONS, CANADA, COSMIC RADIATION, DEVELOPED COUNTRIES, ELEMENTARY PARTICLES, ENERGY RANGE, EVEN-ODD NUCLEI, FERMIONS, GEV RANGE, HADRONS, HELIUM ISOTOPES, HYDROGEN ISOTOPES, IONIZING RADIATIONS, ISOTOPES, LIGHT NUCLEI, MEV RANGE, NORTH AMERICA, NUCLEI, NUCLEONS, ODD-ODD NUCLEI, PROTONS, RADIATIONS, SPECTRA, STABLE ISOTOPES
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[en] We present a new measurement of the cosmic-ray positron fraction at energies between 5 and 15 GeV with the balloon-borne HEAT-p-bar instrument in the spring of 2000. The data presented here are compatible with our previous measurements, obtained with a different instrument. The combined data from the three HEAT flights indicate a small positron flux of nonstandard origin above 5 GeV. We compare the new measurement with earlier data obtained with the HEAT-e± instrument, during the opposite epoch of the solar cycle, and conclude that our measurements do not support predictions of charge sign dependent solar modulation of the positron abundance at 5 GeV
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(c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
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[en] The five large solar particle events during October-November 2003 presented an opportunity to test shock acceleration models with in-situ observations. We use solar particle spectra of H to Fe ions, measured by instruments on ACE, SAMPEX, and GOES-11, to investigate the Q/M-dependence of spectral breaks in the 28 October 2003 event. We find that the break energies scale as (Q/M)b with b ≤ 1.56 to 1.75, somewhat less than predicted. We also conclude that SEP spectra >100 MeV/nucleon are best fit by a double power-law shape
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4. annual IGPP international astrophysics conference; Palm Springs, CA (United States); 26 Feb - 3 Mar 2005; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
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[en] We present a new measurement of atmospheric muons made during an ascent of the High Energy Antimatter Telescope balloon experiment. The muon charge ratio μ+/μ- as a function of atmospheric depth in the momentum interval 0.3-0.9 GeV/c is presented. The differential μ- intensities in the 0.3-50 GeV/c range and for atmospheric depths between 4-960 g/cm2 are also presented. We compare these results with other measurements and model predictions. We find that our charge ratio is ∼1.1 for all atmospheric depths and is consistent, within errors, with other measurements and the model predictions. We find that our measured μ- intensities are also consistent with other measurements, and with the model predictions, except at shallow atmospheric depths
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(c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
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AIRCRAFT, ANTILEPTONS, ANTIMATTER, ANTIPARTICLES, CHARGED PARTICLE DETECTION, COSMIC RADIATION, DETECTION, DIMENSIONLESS NUMBERS, DIMENSIONS, ELEMENTARY PARTICLES, ENERGY RANGE, EVALUATION, FERMIONS, IONIZING RADIATIONS, LEPTONS, MASSLESS PARTICLES, MATTER, MUONS, NEUTRINOS, RADIATION DETECTION, RADIATIONS
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