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Published 1990 | Version Published
Book Section - Chapter Open

A Measurement of the Isotopic Composition of Cosmic Ray Iron

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Abstract

We present a new measurement of the isotopic composition of cosmic ray iron in the energy interval ~1550-2200 MeV /nucleon. The data were collected during the May 1984 flight of a balloon-borne spectrometer and show an average mass resolution of ~0.7 amu. The instrument employed the Cerenkov-Energy technique for mass determination. The observed ^(54)Fe/^(56)Fe ratio, 0.14 +0.18/-0.11 at the top of the atmosphere, is consistent with a solar system composition at the cosmic ray source. We also place an upper limit on the ^(58)Fe/^(56)Fe ratio at the top of the atmosphere of ≤.07. Both are consistent with previous measurements at lower energies.

Additional Information

© Organizing Committee of the 21st Int. Cosmic Ray Conf. Provided by the NASA Astrophysics Data System. This work was supported in part by NASA under grant NGR 05- 002-160. We are grateful to P. S. Gibner for his contributions to this work and to the personnel of the National Scientific Balloon Facility and the Wallops Flight Facility for their excellent support.

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45633
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CaltechAUTHORS:20140509-091626822

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http://adsabs.harvard.edu/full/1990ICRC....3...53G (URL)

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NASA
NCR 05-002-160

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2014-05-09
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2020-03-09
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Space Radiation Laboratory
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Space Radiation Laboratory
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1989-14