PHYSICAL CHARACTERISTICS OF THE SOFG-120 POLYMETHYL METHACRYLATE SCINTILLATOR

We studied the properties of a polymethyl methacrylate scintillator th at is used in the high-performance scintillation trigger device of the liquid-argon neutrino detector of the Tagged Neutrino Experiment. The following main characteristics are obtained for the SOFG-120 scintill ator (approximately 85% of PMMA, 14% of naphthalene, 0.8% of PPO, and 0.08% of POPOP): the luminescence spectrum; the light yield (50% from the light yield of NE 110); the luminescence decay time (4.8 nsec); an d the attenuation length of the intrinsic light (congruent-to 1 m for a strip of 1265 x 333 x 22 mm).