PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix
Abstract
The polystyrene doped 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, 283, 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.
© 2015 Anna Wieczorek, Bożena Zgardzińska, Bożena Jasińska, Marek Gorgol, Tomasz Bednarski, Piotr Białas, Eryk Czerwiński, Aleksander Gajos, Daria Kamińska, Łukasz Kapłon, Andrzej Kochanowski, Grzegorz Korcyl, Paweł Kowalski, Tomasz Kozik, Wojciech Krzemień, Ewelina Kubicz, Szymon Niedźwiecki, Marek Pałka, Lech Raczyński, Zbigniew Rudy, Oleksandr Rundel, Neha Gupta Sharma, Michał Silarski, Artur Słomski, Adam Strzelecki, Wojciech Wiślicki, Marcin Zieliński, Paweł Moskal, published by Institute of Nuclear Chemistry and Technology
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