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Abundance of 3He in the local interstellar cloud

Nature volume 381, pages 210–212 (1996)Cite this article

Abstract

THE primordial abundances of the light elements and their isotopes provide essential information regarding the nucleosynthetic processes that occurred in the Big Bang1,2. At present the best estimates of the baryon/photon ratio of the Universe, a fundamental cosmological parameter, are extrapolations to primordial times of light-element abundances measured in Solar System objects and in the Milky Way. Here we report a direct measurement of the 3He/4He abundance ratio in the local interstellar cloud, based on the isotopic analysis of helium atoms that have entered the Solar System from the surrounding interstellar medium. Our observations, together with the local-cloud D/H ratio3–5 and Solar System light-element data2, permit an improved estimate of the baryon/photon ratio. We find that, within present limits of error, the sum of the 3He and deuterium abundances has remained essentially unchanged since the formation of the Solar System, placing new constraints on models of Galactic chemical evolution6.

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Authors and Affiliations

  1. Department of Physics and IPST, University of Maryland, College Park, Maryland, 20742, USA

    George Gloeckler

  2. International Space Science Institute, Hallerstrasse 6, CH-3012, Bem, Switzerland

    Johannes Geiss

Authors
  1. George Gloeckler
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  2. Johannes Geiss
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Gloeckler, G., Geiss, J. Abundance of 3He in the local interstellar cloud. Nature 381, 210–212 (1996). https://doi.org/10.1038/381210a0

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