The decrease of light yield collection for scintillation counters of CDF muon trigger over time

The muon system of CDF spectrometer plays an important role in investigating processes with heavy quarks. The efficient functioning of scintillation counters, which comprise a considerable part of the CFD muon trigger, is a necessary condition for obtaining experimental data. The results of long-term measurements of the light yield, collected far from the photomultiplier end of the scintillation plate for different types of counters in order to predict the period of their effective operation in experiments, are presented.

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