Contribution Poster reactor
Seasonal muon modulation at Daya Bay
for the Daya Bay collaboration
Session and Location
Monday Session, Poster Wall #180 (Ballroom)
In recent years, the underground muon flux was observed to be seasonally modulated, as caused to atmospheric density variations due to the atmospheric temperature. With eight identically designed detectors located in three underground experimental halls at different overburdens (250, 265 and 860 meters of water equivalent), the Daya Bay reactor antineutrino experiment is an excellent facility to study this phenomenon. With a dataset collected over two-years, the underground muon rate is observed to be positively correlated with the effective atmospheric temperature, and to follow a seasonal modulation pattern. Results on the correlation coefficient α, describing how a variation in the muon rate relates to a variation in the effective atmospheric temperature, are represented in this poster.
Poster included in proceedings: