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The Isotopic Composition of Hydrogen and Helium in Low Energy Cosmic Rays

Mewaldt, R. A. and Stone, E. C. and Vogt, R. E. (1975) The Isotopic Composition of Hydrogen and Helium in Low Energy Cosmic Rays. In: Proceedings of the 14th International Cosmic Rays Conference. Vol.1. Max Planck Gesellschaft , pp. 306-311. http://resolver.caltech.edu/CaltechAUTHORS:20140410-103751097

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Abstract

The Caltech Electron/Isotope Spectrometer on IMP-7 has been used to identify the isotopes ^2H and ^3He in low energy cosmic rays during solar quiet periods from October 1972 to October 1974. These observations cover the energy intervals 5 - 29 MeV/nuc for ^2H and 7 - 50 MeV/nuc for ^3He. The energy spectra of ^1H, ^2H and ^3He all fall rapidly with decreasing energy, giving ^2H/ ^1H and ^3He/ ^1H ratios essentially independent of energy as expected from adiabatic acceleration. The measured ^4He spectrum, however, was essentially flat over this energy interval, and therefore the ^2H/^4He ratio observed at 1 AU is not simply related to the interstellar abundances of these nuclei. However, comparisons of the ^2H/^1H and ^3He/^1H ratios with calculated spectra are possible.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://adsabs.harvard.edu/abs/1975ICRC....1..306MADSArticle
Contact Email Address:dmiles@caltech.edu
Additional Information:This work was supported in part by NASA under contract NAS5-11066 and Grant NGR 05-002-160. G. J. Hurford made important contributions to a number of aspects of this work.
Group:Space Radiation Laboratory
Funders:
Funding AgencyGrant Number
NASANAS5-11066
NASANGR 05-002-160
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1975-04
Record Number:CaltechAUTHORS:20140410-103751097
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140410-103751097
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ID Code:44852
Collection:CaltechAUTHORS
Deposited By: SWORD User
Deposited On:14 Apr 2014 23:50
Last Modified:14 Apr 2014 23:50

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