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PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix

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arxiv 1508.06820 v1 pith:UANIHEA2 submitted 2015-08-27 physics.ins-det nucl-ex

PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix

A. Wieczorek , B. Zgardzi\'nska , B. Jasi\'nska , M. Gorgol , T. Bednarski , P. Bia{\l}as , E. Czerwi\'nski , A. Gajos
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D. Kami\'nska {\L}. Kap{\l}on A. Kochanowski G. Korcyl P. Kowalski T. Kozik W. Krzemie\'n E. Kubicz S. Nied\'zwiecki M. Pa{\l}ka L. Raczy\'nski Z. Rudy O. Rundel N.G. Sharma M. Silarski A. S{\l}omski A. Strzelecki W. Wi\'slicki M. Zieli\'nski P. Moskal
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classification physics.ins-det nucl-ex
keywords intensitymaterialo-psplasticpolystyrenescintillatorbenzoxazoledependence
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The polystyrene dopped with 2,5-diphenyloxazole as a primary fluor and 2-(4-styrylphenyl)benzoxazole as a wavelength shifter, prepared as a plastic scintillator was investigated using positronium probe in wide range of temperatures from 123 to 423 K. Three structural transitions at 260 K, 283 K and 370 K were found in the material. In the o-Ps intensity dependence on temperature, the significant hysteresis is observed. Heated to 370 K, the material exhibits the o-Ps intensity variations in time.

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