Cosmic Ray Helium Isotopes From 0.2 to 3.6 GeV/nucleon

Astronomy and Astrophysics – Astrophysics

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Scientific paper

The abundances of cosmic ray helium isotopes were measured by the IMAX balloon-borne magnet spectrometer during a flight in July, 1992. A high-resolution time-of-flight system and two silica aerogel Cherenkov counters were used in conjunction with a drift-chamber/MWPC-tracking system to determine mass by means of the velocity vs. magnetic rigidity technique. A model of the instrument response was developed in order to unfold the species and rigidity-dependent effects. Measurements and astrophysical interpretation of the ^3He/^4He isotope ratio from 0.2 to 3.6 GeV/nucleon will be presented. The IMAX experiment was supported by NASA: RTOP 353-87-02 (GSFC), grants NAGW-1919 (Caltech) and NAGW-1418 (NMSU), and in Germany by the DFG and the BMFT. ^1currently at Max-Planck-Institut für Extraterrestrische Physik

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