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Moon and Sun shadowing effect in the MACRO detector
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2003 (English)In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 20, no 2, p. 145-156Article in journal (Refereed) Published
Abstract [en]

Using data collected by the MACRO experiment from 1989 to the end of its operations in 2000, we have studied in the underground muon flux the shadowing. effects due to both the Moon and the Sun. We have observed the shadow cast by the Moon at its apparent position with a significance of 6.5sigma. The Moon shadowing effect has been used to verify the pointing capability of the detector and to determine the instrument resolution for the search of muon excesses from any direction of the celestial sphere. The dependence of the effect on the geomagnetic field is clearly shown by splitting the data sample in day and night observations. The Sun shadow, observed with a significance of 4.6sigma is displaced by about 0.6degrees from its apparent position. In this case however the explanation resides in the configuration of the Solar and Interplanetary Magnetic Fields, which affect the propagation of cosmic ray particles between the Sun, and the Earth. The displacement of the Sun shadow with respect to the real Sun position has been used to establish an upper limit on the antimatter flux in cosmic rays of about 48% at 68% c.l. and primary energies of about 20 TeV. (C) 2003 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2003. Vol. 20, no 2, p. 145-156
Keyword [en]
MACRO, underground muons, Moon shadowing, Sun shadowing, geomagnetic field, IMF field, primary antimatter
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-30290DOI: 10.1016/S0927-6505(03)00169-5ISI: 000186389100005OAI: oai:DiVA.org:lnu-30290DiVA, id: diva2:705284
Available from: 2014-03-15 Created: 2013-11-08 Last updated: 2017-12-05Bibliographically approved

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Battistoni, GBecherini, YvonneCafagna, FLamanna, ESirri, G

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Battistoni, GBecherini, YvonneCafagna, FLamanna, ESirri, G
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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf