Temporal Characteristics of Light Collection in the Liquid Scintillation Counter with a Volume of 1.5 m3 and Quasi-mirror Reflection

The temporal behavior of light collection in the 1.5-m(3)-volume mirror-reflecting counter filled with a highly transmitting liquid scintillator has been investigated. Using the Monte Carlo method and assuming that the luminescence decay time of the liquid scintillator is zero (tau(LS) = 0), it has been ascertained that, in the case of a short flash in a counter, the exponential phase of light collection is characterized by time tau(col) = 15.0 +/- 1.7 ns, which is does not depend on scattering of light in the medium. The measured exponent index tau(act) = 37 +/- 3 ns of an actual pulse due to a muon is determined both by light collection time tau(col) a parts per thousand 15 ns and luminescence decay time tau(LS) a parts per thousand 20 ns of the scintillator in the large-volume counter.