The isotopic composition of hydrogen and helium in low-energy cosmic rays

Details The isotopic composition of hydrogen and helium in low-energy cosmic rays The isotopic composition of hydrogen and helium in low-energy cosmic rays

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..616m&link_type=abstract

Astrophysical Journal, vol. 206, June 1, 1976, pt. 1, p. 616-621.

Astronomy and Astrophysics

Astrophysics

15

Abundance, Cosmic Rays, H Lines, Helium Isotopes, Hydrogen Isotopes, Mass Spectra, Explorer 47 Satellite, Graphs (Charts), Particle Energy, Solar Activity

Scientific paper

The isotopes H-2 and He-3 have been identified in low-energy cosmic rays during solar-quiet periods from 1973 January to 1974 October. These observations, made with the electron/isotope spectrometer on IMP-7, cover the energy intervals 5-29 MeV per nucleon for H-2 and 7-50 MeV per nucleon for He-3. The energy spectra of H-1, H-2, and He-3 fall rapidly with decreasing energy, giving H-2/H-1 and He-3/H-1 ratios which are essentially independent of energy as expected from current theories of the solar modulation of galactic cosmic rays. The measured He-4 spectrum, however, is essentially flat below 40 MeV per nucleon, suggesting that there may be contributions from a local, nonsolar source of He-4. Comparisons of the H-1, H-2, and He-3 observations with calculated spectra at 1 AU imply a mean interstellar path length of 7 plus or minus 2 g/sq cm. However, present low-energy measurements of H and He isotopes at 1 AU do not discriminate between possible cosmic-ray source spectra.

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