EFFECTS OF NEUTRAL GAS ATMOSPHERE AND TEMPERATURE ON THE LIGHT YIELD OF NEW LIQUID SCINTILLATORS

Liquid scintillator, based on 1-methylnaphthalene and a new solvent IP N, which emitting in the green spectral range, were studied. The scint illation efficiency in vacuum was 22-32% higher compared to the level in air, and the intrinsic light yield of the scintillators reached 41- 50% of the yield from anthracene. The increased level of the scintilla tion efficiency was virtually retained in the atmosphere of inert gase s (Ne, Ar, and CO2). The light yield of liquid scintillators based on 1-methylnaphthalene (in air) and IPN (in vacuum) were virtually indepe ndent of the temperature in the interval from -5 to +20 degrees C. Liq uid scintillator on the basis of 1-methylnaphthalene and a scintillati on additive R6 (concentration 3 g/l) also exhibited a highly stable li ght yield (+0.024%/K) in the temperature interval from +20 to +60 degr ees C.