NASA NTRS · 19730022979
Isotopic composition of heavy cosmic rays
Abstract
The mean isotopic composition was measured of even-charge cosmic ray elements with 14 equal to or less than 26 near 0.8 GeV/N using a balloon-borne ionization-chamber/Cerenkov-counter detector system. The experimental method makes use of the geomagnetic field as a magnetic spectrometer. Results indicate that the most abundant isotopes at the cosmic ray source are Si-28, S-32, and Ca-40, like the solar system; but Fe-54, unlike the solar system.
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Maehl, R. C., Isreal, M. H., Klarmann, J.. 1973-01-01. Isotopic composition of heavy cosmic rays. https://ntrs.nasa.gov/citations/19730022979
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