Novel 1,8-naphthalimides for fast neutron/gamma discrimination in liquid scintillators
Résumé
Several novel 4-substituted 1,8-naphthalimides were synthesized and used as fluorescent molecules for the preparation of liquid scintillators. Advantageously, these molecules exhibit a large Stokes shift, avoiding self-absorption processes and considerably simplifying the scintillator composition. Discrimination between fast neutrons and gamma rays was investigated by using the charge comparison method. This technique deals with the identification of neutrons from gamma rays by the shape of the light pulse delivered in the scintillator. The influence of naphthalimide substituents on the scintillator performances was examined. Only one blue fluorescing 4-substituted 1,8-naphthalimide showed an efficient discrimination capability. Light yields comparable to those of commercially available liquid scintillators were also observed.
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