Development of liquid scintillator containing 8-quinolinolate indium complex for measurement of low energy solar neutrinos

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An organic liquid scintillator containing indium complex was studied for a measurement of low energy solar neutrinos. The energy of the emitted electrons from those processes could be transferred to the molecular of complex via the organic solvent molecules, and the luminescence from the indium complex would be detected by the photo-multiplier. Here we report some results obtained by photo-luminescence and the γ's inducedenergy spectra of tris (8-quinolinolate) indium (InQ3) complex. Benzonitrile was chosen as a solvent because of good solubility for the quinolinolate complexes (2wt%) and of good light yield for the scintillation induced by γ's irradiation. The photo-luminescence emission spectra of InQ3 of 30 M solution in benzonitrile was measured. The emission maxima for InQ3 is found at 559 nm as excitation wavelength: 397 nm. We prepared InQ3 (50 mg 〜 200mg) of benzonitrile solutions (20mL). Two secondary scintillators, 100 mg of 2,5-diphenyloxazole (PPO) and 10mg of 1,4- bis[2-(5-phenyloxazolyl)]benzene (POPOP), are also dissolved in above solutions and they play a role of wavelength shifter from the UV region emitted by excited benzonitrile molecules to the visible region emitted by InQ3 complex. The energy spectra of electrons emitted by Compton scattering of incident γ's using 60 Co radio isotope was obtained. These results are the first observation of the γ's energy spectra using luminescent metal complexes.