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Title: The cosmic-ray He-3/He-4 ratio from 200 MeV per nucleon(-1) to 3.7 GeV per nucleon(-1)
Type: Journal articleJournal article
Participant(s):
Forfatter:  Reimer, O.
Technical University of Denmark

Forfatter:  Menn, W.
Technical University of Denmark

Forfatter:  Hof, M.
Technical University of Denmark

Forfatter:  Simon, M.
Technical University of Denmark

Forfatter:  Davis, A.J.
Technical University of Denmark

Forfatter:  Labrador, A.W.
Technical University of Denmark

Forfatter:  Mewaldt, R.A.
Technical University of Denmark

Forfatter:  Schindler, S.M.
Technical University of Denmark

Forfatter:  Barbier, L.M.
Technical University of Denmark

Forfatter:  Christian, E.R.
Technical University of Denmark

Forfatter:  Krombel, K.E.
Technical University of Denmark

Forfatter:  Mitchell, J.W.
Technical University of Denmark

Forfatter:  Ormes, J.F.
Technical University of Denmark

Forfatter:  Streitmatter, R.E.
Technical University of Denmark

Forfatter:  Golden, R.L.
Technical University of Denmark

Forfatter:  Stochaj, S.J.
Technical University of Denmark

Forfatter:  Webber, W.R.
Technical University of Denmark

Author:  Rasmussen, Ib Lundgaard (Cwisno: 38288)
Technical University of Denmark
Email:

Abstract: 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 He-3/He-4 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.
Published: in journal: Astrophysical Journal (ISSN: 0004-637X), vol: 496, issue: 1, pages: 490-502, 1998
See the publication in DTU Orbit See the publication in DTU Orbit

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