Cosmic Ray Shielding at NO v A. Travis Olson Krissie Nosbisch. Abstract.
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We used a muon telescope to calculate the cosmic ray background at the NOvA site and determine how effective the barite and other rock around the detector were at shielding. The cosmic ray flux was found to be 0.0053 ± 7.1x10-5muons cm-2sr-1s-1 under the barite which is 29 ± 1.4% less than the flux outside. The rate of electromagnetic showers is 0.0028 ± .0006 showers per second which is 77 ± 5.3% less than the rate outside.
Top view of the box showing the garbage bags and duct tape for light-proofing.
High voltage and signal cables
Photomultiplier tube with mirrored base
White reflective clothMuon Telescope Design