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Multiple dye interactions in plastic scintillators: Effects on pulse shape discrimination
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment ( IF 1.4 ) Pub Date : 2020-07-22 , DOI: 10.1016/j.nima.2020.164455
N.P. Zaitseva , A.M. Glenn , M.L. Carman , A.N. Mabe , S.A. Payne , N. Marom , X. Wang

The scintillation process in plastic scintillators has been studied with mixed systems containing high concentrations of multiple fluorescence dyes. It has been shown that the triplet–triplet interaction phenomena leading to the production of delayed light and pulse shape discrimination (PSD) can vary depending on the triplet energies of the interacting dyes. At small differences between the first excited triplet state energies, found to be below 0.1 eV, a pair of interacting dyes of different molecular species can be involved in heterogeneous excitation migration and triplet–triplet annihilation that result in the enhancement of delayed light and PSD, due to the engagement of both dyes in the process. At differences above 0.27 eV, excitation trapping on the lower energy triplet molecules leads to conditions when triplet–triplet migration and annihilation can proceed only homogeneously between molecules of the same species. The results explain the different effects produced by the selection of fluorescent dyes in previously reported PSD systems containing one primary and one secondary dyes. They also demonstrate a non-traditional approach to the design of new plastic scintillators with multiple dyes that, at improved scintillation and PSD performance, may simplify the production process.



中文翻译:

塑料闪烁体中的多种染料相互作用:对脉冲形状判别的影响

已经使用含有高浓度多种荧光染料的混合系统研究了塑料闪烁体中的闪烁过程。已经表明,导致延迟光产生和脉冲形状识别(PSD)的三重态-三重态相互作用现象可能会根据相互作用染料的三重态能量而变化。在第一激发三线态能量之间的微小差异(低于0.1 eV)下,一对不同分子物种的相互作用染料可能参与异质激发迁移和三重态-三重态an灭,从而导致延迟光和PSD的增强,由于两种染料都参与了该过程。在以上差异0.27 eV,低能三重态分子上的激发陷阱导致三重态-三重态迁移和ni灭只能在相同物种的分子之间均匀进行的条件。结果解释了在先前报道的包含一种原色和一种第二种染料的PSD系统中,荧光染料的选择所产生的不同影响。他们还展示了一种非传统方法来设计具有多种染料的新型塑料闪烁体,这种闪烁体具有更好的闪烁和PSD性能,可以简化生产过程。

更新日期:2020-07-22
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