Composition of cosmic-ray nuclei from boron to nickel for 1200 to 2400 MeV per nucleon

Details Composition of cosmic-ray nuclei from boron to nickel for 1200 to 2400 MeV per nucleon Composition of cosmic-ray nuclei from boron to nickel for 1200 to 2400 MeV per nucleon

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..441d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 15, 1985, p. 441-454.

Astronomy and Astrophysics

Astrophysics

17

Abundance, Cosmic Ray Showers, Galactic Cosmic Rays, Heavy Nuclei, Particle Acceleration, Particle Telescopes, Balloon-Borne Instruments, Cerenkov Counters, Energetic Particles, Energy Spectra, High Energy Interactions, Interstellar Chemistry, Nuclear Fusion, Proportional Counters, Scintillation Counters

Scientific paper

Balloon-borne measurements of cosmic-ray nuclear abundances for Z = 5-28 and energies 1.2-1.4 GeV/nucleon, obtained using the scintillation/Cerenkov-counter telescope and multiwire proportional counter described by Dwyer et al. (1984) on four flights from Texas and Oklahoma during 1973-1975, are reported. The data are presented in tables and graphs and compared with published observations. Charge separation (sigma = 0.2 units for Fe) and exposure factor (38 sq m sr h) are attained, and the findings are found to be in good agreement with the predictions of a simple leaky-box model of the Galaxy and a pure exponential path-length distribution, although a nested-leaky-box model with some truncation is possible. The delay between e-process nucleosynthesis and cosmic-ray acceleration is estimated on the basis of the Co abundance at greater than 100 d and probably greater than 100,000 yr.

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