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- W1990055958 abstract "The study of the light-pulse shape, the initial delay of light pulses and the light yield of plastics prepared by a modification of the NE111 scintillator were performed. The NE111 scintillator doped with several quench agents, the plastics prepared as a solution of butyl PBD in PVT of different concentration and PVT alone were studied. The study confirmed that the light pulse shape from fast binary plastics is well described analytically by the convolution of the clipped Gaussian and exponential functions. The investigation of the PVT-butyl PBD plastics showed that even more than three times larger concentration of butyl PBD compared to that of PBD in the NE111 solution does not improve the rise of the light pulse. Thus the rise time seems to be not controlled by the intermolecular energy transfer process. Finally the observed finite rise time of the light pulse from the PVT sample was also approximated well by the Gaussian function. Alltogether it brought a strong support for the earlier hypothesis that the initial slow rise of light pulses from plastic scintillators may come from the deexcitation of several higher levels of the solvent molecules excited by nuclear particles. The analysis of discrepancies between results of the presented study and those performed by Lyons et al., who use the sampling technique with the electron Linac excitation of scintillators and streak camera technique with the X-ray excitation was performed. It seems to suggest that faster light pulses observed by Lyons et al., are associated with the very high energy of the scintillator excitation above 108 MeV. It may not correspond to the properties of scintillators at excitation energies of few MeV as usually applied in nuclear physics and as it was the case in the present study." @default.
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- W1990055958 date "1978-09-01" @default.
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- W1990055958 title "Study of primary energy transfer process in ultrafast plastic scintillators" @default.
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- W1990055958 doi "https://doi.org/10.1016/0029-554x(78)90207-0" @default.
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