Abstract
The design of a large-volume underground anticoincidence detector is presented, together with the results obtained from it. The detector was situated at a depth of 62 hg cm-2 and consisted of a 1 m cube of liquid scintillator surrounded by anticoincidence detectors. The performance of the system has been investigated extensively and the energy spectrum of anticoincidence events obtained. An examination of these events shows that they are due mainly to bremsstrahlung from electrons knocked on by muons in the rock surrounding the detector. An excess, of the order of a few per hour, of time-correlated events at times of less than 1000 mu s has been found and these are shown to be due to neutrons produced by muons in the surrounding rock.
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