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Isotopic Composition of the Anomalous Low Energy Cosmic Ray Nitrogen and Oxygen

Mewaldt, R. A. and Stone, E. C. and Vidor, S. B. and Vogt, R. E. (1975) Isotopic Composition of the Anomalous Low Energy Cosmic Ray Nitrogen and Oxygen. In: Proceedings of the 14th International Cosmic Rays Conference. Vol.1. Max Planck Gesellschaft , pp. 349-354.

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The isotopic composition of the enhanced fluxes of cosmic ray nitrogen and oxygen observed below 30 MeV/nuc is of interest, whether the nuclei are a sample from some nearby galactic source region that is underabundant in carbon, or a sample of the neutral interstellar medium. Enhanced fluxes in the 6 to 12 MeV/nuc energy interval were measured over a two year period with the Caltech Electron/Isotope Spectrometer on IMP-7. The observed low-energy nitrogen and oxygen nuclei are predominantly N-14 and O-16, with upper limits (84% confidence level) of N-15/N below 0.26, O-17/0 below 0.13, and O-18/0 below 0.12 for other isotopes in the 6-12 MeV/nuc energy interval. The implications of these results for the origin of the enhanced nitrogen and oxygen fluxes are discussed.

Item Type:Book Section
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Mewaldt, R. A.0000-0003-2178-9111
Stone, E. C.0000-0002-2010-5462
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Group:Space Radiation Laboratory
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Space Radiation Laboratory1975-07
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Deposited On:14 Apr 2014 23:17
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