Influence of dissolved gas and temperature on the light yield of new liquid scintillators

Sixteen new liquid scintillators, emitting green light, were studied. They are based on four solvents combined with four dopants. The influence of different gas atmospheres was studied. In particular it was shown that by keeping these liquid scintillators in vacuum or in a neutral gas, the light yield increases up to 32~\% at 20 $^{\circ}$C and for the best solvent-dopant combinations. The dependance of the light yield on temperature was also studied for these scintillators. In the 20--60 $^{\circ}$C interval, some exhibit a light yield variation of $\sim$ 3 \% which is smaller than that of the NE 102A plastic scintillator.