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Title:
The cosmic-ray He-3/He-4 ratio from 100 to 1600 MeV/amu
Authors:
Beatty, J. J.; Ficenec, D. J.; Tobias, S.; Mitchell, J. W.; McKee, S.; Nutter, S.; Tarle, G.; Tomasch, A.; Clem, J.; Guzik, T. G.; Lijowski, M.; Wefel, J. P.; Bower, C. R.; Heinz, R. M.; Mufson, S. L.; Musser, J.; Pitts, J. J.; Spiczak, G. M.; Ahlen, S. P.; Zhou, B.
Affiliation:
AA(Washington Univ., Saint Louis, MO), AB(Washington Univ., Saint Louis, MO), AC(Washington Univ., Saint Louis, MO), AD(Universities Space Research Association, Greenbelt, MD), AE(Michigan Univ., Ann Arbor), AF(Michigan Univ., Ann Arbor), AG(Michigan Univ., Ann Arbor), AH(Michigan Univ., Ann Arbor), AI(Louisiana State University, Baton Rouge), AJ(Louisiana State University, Baton Rouge)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 1, p. 268-280. (ApJ Homepage)
Publication Date:
08/1993
Category:
Space Radiation
Origin:
STI
NASA/STI Keywords:
Galactic Cosmic Rays, Helium Isotopes, Nuclear Fusion, Particle Acceleration, Abundance, Milky Way Galaxy
DOI:
10.1086/172994
Bibliographic Code:
1993ApJ...413..268B

Abstract

The Superconducting Magnet Instrument for Light Isotopes (SMILI) flew for 19 hours on September 1, 1989, with a residual overburden of 5 g/sq cm. It measured the charge, rigidity, and velocity of 30,000 cosmic-ray helium nuclei, with velocity determined by time-of-flight and Cerenkov techniques. Using these data, the flux and isotopic composition of helium as a function of energy were determined. The observed isotopic composition is consistent with that expected from interstellar propagation models inferred from the secondaries of CNO, in contrast to earlier observations which indicated an overabundance of He-3. We discuss constraints that this result places on cosmic-ray transport and solar modulation models.

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