Search for H2-He alloy formation at low pressures and cosmic snowballs

Details Search for H2-He alloy formation at low pressures and cosmic snowballs Search for H2-He alloy formation at low pressures and cosmic snowballs

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...368..178l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. 178-180.

Astronomy and Astrophysics

Astrophysics

1

Dark Matter, Helium, Interstellar Matter, Metallic Hydrogen, Cosmic Dust, Partial Pressure, Phase Diagrams, Solidified Gases

Scientific paper

If a substantial fraction of the dark matter in the universe were in the form of relatively small lumps of solid hydrogen (cosmic snowballs) the He mass fraction (Y) should have changed over the history of the universe contrary to present belief. A laboratory experiment has been performed at 4.2 K to see if an unexpected H2-He alloy might form at low pressures and relieve this basic objection. A limit of less than one part in 1000 by mass for He in the bulk solid H2 deposited from the vapor on a copper cold finger has been established. However, less than about 1 monolayer of He atoms can plate on the solid H2 surface. The basic objection to cosmic snow-balls remains intact.

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