A New Upper Limit to the Galactic Deuterium-to-Hydrogen Ratio

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

THE detection of the 21-cm. hydrogen line, in 1951, created interest in the possibility of detecting a similar deuterium line at a wave-length of 91.6 cm. By comparing the strengths of the two lines, the galactic deuterium-to-hydrogen ratio, ND/NH, could be determined. This quantity is of astrophysical interest because it will give information about the composition and nucleogenesis of the interstellar medium1,2.

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