Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-11-06
Phys.Rev.D67:042002,2003
Astronomy and Astrophysics
Astrophysics
18 pages, 8 of which are figures, 1 is a table. Accepted by Phys. Rev. D
Scientific paper
10.1103/PhysRevD.67.042002
We have analyzed 44.3M single muons collected by MACRO from 1991 through 2000 in 2,145 live days of operation. We have searched for the solar diurnal, apparent sidereal, and pseudo-sidereal 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 pseudo-sidereal 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 Perseus spiral arm.
Ambrosio M.
The MACRO Collaboration
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