Observation of seasonal variation of atmospheric multiple-muon events in the NOvA Near Detector


Acero M. A. , Adamson P., Aliaga L., Alion T., Allakhverdian V., Altakarli S., ...More

PHYSICAL REVIEW D, vol.99, no.12, 2019 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 99 Issue: 12
  • Publication Date: 2019
  • Doi Number: 10.1103/physrevd.99.122004
  • Title of Journal : PHYSICAL REVIEW D

Abstract

Using two years of data from the NOvA Near Detector at Fermilab, we report a seasonal variation of cosmic ray induced multiple-muon (N-mu >= 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.