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- W2108737502 abstract "view Abstract Citations (15) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Isotopic and elemental composition of the anomalous low-energy cosmic-ray fluxes. Mewaldt, R. A. ; Stone, E. C. ; Vidor, S. B. ; Vogt, R. E. Abstract Recent observations of cosmic rays below 30 MeV nucleon -1 have revealed anomalous enhancements in the energy spectra of oxygen, nitrogen, and helium relative to those of other nuclei such as boron and carbon. We have measured the quiet-time fluxes of the elements hydrogen through oxygen in the 430 MeV nucleon -` energy interval during the period 1972 October through 1974 October. We find that the low-energy fluxes of Li, Be, B, and C are consistent with those expected from adiabatic deceleration and show no significant evidence for secondary fragmentation products arising from the enhanced nitrogen and oxygen fluxes. In the 6-12 MeV nucleon -1 interval, the observed nitrogen and oxygen nuclei are predominantly ` N and 16Q, with upper limits (84% confidence level) of 15N/N < 0.26, 170/0 < 0.13, and 180/0 < 0.12 for the other stable nitrogen and oxygen isotopes. These isotopic measurements are consistent with the presumed isotopic composition of the neutral interstellar medium, as would be the case if the anomalous component is locally accelerated. If, on the other hand, the enhanced low-energy cosmic rays result from unusual nucleosynthesis processes which enhance nitrogen and oxygen but not carbon, then these processes are constrained to producing predominantly and 160. Subject heading: cosmic rays: abundances Publication: The Astrophysical Journal Pub Date: May 1976 DOI: 10.1086/154348 Bibcode: 1976ApJ...205..931M Keywords: Abundance; Chemical Composition; Cosmic Rays; Isotopes; Energy Spectra; Histograms; Kinetic Energy; Nitrogen; Oxygen; Space Radiation full text sources ADS |" @default.
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- W2108737502 title "Isotopic and elemental composition of the anomalous low-energy cosmic-ray fluxes" @default.
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