Observation of seasonal variation of atmospheric multiple-muon events in the NOvA Near Detector
Abstract
Using two years of data from the NOvA Near Detector at Fermilab, we report a seasonal variation of cosmic ray induced multiple-muon (Nμ≥2 ) event rates which has an opposite phase to the seasonal variation in the atmospheric temperature. The strength of the seasonal multiple-muon variation is shown to increase as a function of the muon multiplicity. However, no significant dependence of the strength of the seasonal variation of the multiple-muon variation is seen as a function of the muon zenith angle, or the spatial or angular separation between the correlated muons.
- Publication:
-
Physical Review D
- Pub Date:
- June 2019
- DOI:
- 10.1103/PhysRevD.99.122004
- arXiv:
- arXiv:1904.12975
- Bibcode:
- 2019PhRvD..99l2004A
- Keywords:
-
- Physics - Instrumentation and Detectors;
- Astrophysics - Earth and Planetary Astrophysics;
- Astrophysics - Instrumentation and Methods for Astrophysics
- E-Print:
- Phys. Rev. D 99, 122004 (2019)