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A search for antihelium in primary cosmic radiation.A search for anti-alpha-particles in the primary cosmic radiation has been carried out, and a new upper limit for these particles in the range 0.2-4.3 GeV per nucleon has been obtained. At the 95 per cent confidence level the upper limit is found to be 0.14 per cent of the alpha-particle flux. The instrument used for this purpose is a magnetic spectrometer employing spark chambers for determining particle trajectories and time-of-flight measurement for the rejection of upward-moving particles. Implications of these results for various models of the sources of cosmic radiation are discussed.
Document ID
19720058902
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Evenson, P.
(Chicago, University Chicago, Ill., United States)
Date Acquired
August 6, 2013
Publication Date
September 15, 1972
Publication Information
Publication: Astrophysical Journal
Volume: 176
Subject Category
Space Radiation
Accession Number
72A42568
Funding Number(s)
OTHER: NGL-14-001-005
PROJECT: PROJECT SKYHOOK
Distribution Limits
Public
Copyright
Other

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