Cosmic-ray production rates of neon isotopes in meteorite

Bhandari, N. (1988) Cosmic-ray production rates of neon isotopes in meteorite Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 97 (2). pp. 117-125. ISSN 0253-4126

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The rates of production of 21Ne and 22Ne in spallation reactions, both due to solar as well as galactic cosmic rays, in some major meteoritic minerals, e.g. olivines, feldspars and pyroxenes, are calculated using their energy spectra and excitation functions. The production profiles of 21Ne and 22Ne due to galactic cosmic rays, and the 22Ne/21Ne ratio depend upon the size of the meteoroid. The 22Ne/21Ne ratio is very sensitive to the abundance of sodium and consequently its depth profile is distinctly different in feldspars, the ratio increasing with depth rather than decreasing as in pyroxenes and olivines. In the near-surface regions, up to a depth of 2cm, production due to solar flare protons dominates, giving rise to a steep gradient in isotopic production as well as in the 22Ne/21Ne ratio. Composite production profiles are given and compared with measurements in some meteorites.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Meteorites; Solar flares; Galactic cosmic rays; Neon isotopes
ID Code:18485
Deposited On:17 Nov 2010 08:59
Last Modified:17 May 2016 03:12

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