Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...496..490r&link_type=abstract
Astrophysical Journal v.496, p.490
Astronomy and Astrophysics
Astronomy
18
Acceleration Of Particles, Balloons, Ism: Cosmic Rays, Nuclear Reactions, Nucleosynthesis, Abundances
Scientific paper
The abundances of cosmic-ray helium isotopes between 0.2 and 3.7 GeV nucleon-1 were measured by the Isotope Matter Antimatter Experiment (IMAX) during a flight from Lynn Lake, Manitoba, Canada on 1992 July 16-17. The IMAX balloon-borne magnetic spectrometer realized a direct measurement of the charge, the velocity, and the rigidity of cosmic rays using plastic scintillators, a high-resolution time-of-flight system, and two silica-aerogel Cerenkov counters in conjunction with a drift chamber/multiwire proportional chamber tracking system. About 75,000 helium isotopes are identified by their mass using the velocity versus magnetic rigidity technique. The measured 3He/4He ratios are corrected to the top of the atmosphere, and a comparison with previous data is given. The observed isotopic composition is found to be generally consistent with the predictions of a standard leaky box model of cosmic-ray transport in the Galaxy.
Barbier Loius M.
Christian Eric R.
Davis James A.
Golden R. L.
Hof Michael
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