Mathematics – Probability
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226..355b&link_type=abstract
Astrophysical Journal, Part 1, vol. 226, Nov. 15, 1978, p. 355-371. Research supported by the U.S. Department of Energy;
Mathematics
Probability
22
Abundance, Beryllium Isotopes, Cosmic Rays, High Energy Interactions, Interstellar Matter, Balloon-Borne Instruments, Graphs (Charts), Magnetic Rigidity
Scientific paper
A balloon-borne superconducting magnetic spectrometer was used in the measurement of cosmic-ray isotopic abundances from lithium through oxygen in the energy range 200-1500 MeV per nucleon. Except for Be-7 all isotopic composition is essentially energy-independent. Be-10 is nearly absent, indicating a mean cosmic-ray age of 6(-3, +10) x 10 to the 6th years. Above about 500 MeV per nucleon, Be-7 drops dramatically in abundance relative to Be-9 and C. By 1500 MeV per nucleon, the relative abundance of Be-7 has become one-half of its lower-energy value. Since Be-7 is the only isotope measured which decays by electron capture, this result is interpreted as indicating that higher-energy Be-7 had an appreciable probability of not being stripped of all its electrons before entering interstellar space where electron pickup is negligible.
Buffington Andrew
Mast Terry S.
Orth Charles D.
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