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Upper limit on the antihelium flux in primary cosmic rays
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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2011 (English)In: JETP Letters: Journal of Experimental And Theoretical Physics Letters, ISSN 0021-3640, E-ISSN 1090-6487, Vol. 93, no 11, 628-631 p.Article in journal (Refereed) Published
Abstract [en]

The explanation of the observed baryon asymmetry, i.e., the almost complete absence of antimatter in the visible part of the universe, is one of the most important problems in cosmology. The real asymmetry value can be determined by direct measurements of the fluxes of antinuclei with charges |Z| a (c) 3/4 2 in primary cosmic rays near the Earth. The results of the search for antihelium using data from the PAMELA experiment obtained from June 2006 to December 2009 are presented. No events with a charge of -2 have been detected in the rigidity range of 0.6-600 GV. An upper limit on the antihelium/helium flux ratio has been presented as a function of the energy. An integral upper level of 4.7 x 10(-7) is the lowest limit at rigidities above 14 GV.

Place, publisher, year, edition, pages
2011. Vol. 93, no 11, 628-631 p.
Keyword [en]
SEARCH, ANTIMATTER, RADIATION, NUCLEI
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-39023DOI: 10.1134/S0021364011110087ISI: 000293477100002Scopus ID: 2-s2.0-79961037312OAI: oai:DiVA.org:kth-39023DiVA: diva2:438998
Note
QC 20110906Available from: 2011-09-06 Created: 2011-09-06 Last updated: 2017-12-08Bibliographically approved

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Pearce, Mark

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  • apa
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  • en-GB
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Output format
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