Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aps..may.k1003r&link_type=abstract
American Physical Society, APS/AAPT Joint Meeting, May 2-5, 1996, abstract #K10.03
Astronomy and Astrophysics
Astrophysics
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
Barbier Loius M.
Christian Eric R.
Davis James A.
Golden R. L.
Hof Michael
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