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Search for the sidereal and solar diurnal modulations in the total MACRO muon data set
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2003 (English)In: Physical Review D. Particles and fields, ISSN 0556-2821, E-ISSN 1089-4918, Vol. 67, no 4, article id 042002Article in journal (Refereed) Published
Abstract [en]

We have analyzed 44.3M single muons collected by MACRO from 1991 through 2000 in 2145 live days of operation. We have searched for the solar diurnal, apparent sidereal, and pseudosidereal modulation of the underground muon rate by computing hourly deviations of the muon rate from 6 month averages. We find evidence for statistically significant modulations with the solar diurnal and the sidereal periods. The amplitudes of these modulations are <0.1%, and are at the limit of the detector statistics. The pseudosidereal modulation is not statistically significant. The solar diurnal modulation is due to the daily atmospheric temperature variations at 20 km, the altitude of primary cosmic ray interactions with the atmosphere; MACRO is the deepest experiment to report this result. The sidereal modulation is in addition to the expected Compton-Getting modulation due to solar system motion relative to the local standard of rest; it represents motion of the solar system with respect to the galactic cosmic rays toward the galactic plane.

Place, publisher, year, edition, pages
American Physical Society , 2003. Vol. 67, no 4, article id 042002
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-30296DOI: 10.1103/PhysRevD.67.042002ISI: 000181443000003OAI: oai:DiVA.org:lnu-30296DiVA, id: diva2:705270
Available from: 2014-03-14 Created: 2013-11-08 Last updated: 2017-12-05Bibliographically approved

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Becherini, YvonneCafagna, FLamanna, ESirri, G

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Becherini, YvonneCafagna, FLamanna, ESirri, G
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