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IHEP 98 - 65
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| M.I.Barnik, S.G.Yudin (Institute of Crystallography, Moscow, Russia), V.G.Vasil'chenko, S.V.Golovkin, A.M.Medvedkov (IHEP, Protvino, Russia), A.S.Solovjev (JINR, Dubna, Russia) | ||
| New Scintillating Media Based on Liquid Crystals for Particles Detectors | ||
| Protvino, 1998.- p.10, figs. 9, refs.:12. | ||
The study results of optical, photoluminiscent and scintillation properties of a liquid crystal 4-pentyl-4$'$-cyanobiphenyl are presented. The scintillation light output of this liquid crystal is about 35\% of crystal anthracene, main decay time constants are 4 ns and 14 ns and the maximum of light emission spectrum is about 400 nm. The light output of a dissolution of green emitting light scintillation dopant R6 in the liquid crystal is about 120\% of crystal anthracene. The light output of the frozen dissolution measured at -112$^o$C is about 2.5 times higher as observed at +20$^o$C. In the uniaxially oriented liquid crystal, the predominant intensity direction of emitted light is pointed perpendicular to the liquid crystal director and an appreciable part of the emitted light is linearly polarized. A possibility to use scintillation properties of liquid crystals is considered both for the improvement of existing particles detectors characteristics and for the creation of new gated particles detectors.
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