PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix
oleh: Wieczorek Anna, Zgardzińska Bożena, Jasińska Bożena, Gorgol Marek, Bednarski Tomasz, Białas Piotr, Czerwiński Eryk, Gajos Aleksander, Kamińska Daria, Kapłon Łukasz, Kochanowski Andrzej, Korcyl Grzegorz, Kowalski Paweł, Kozik Tomasz, Krzemień Wojciech, Kubicz Ewelina, Niedźwiecki Szymon, Pałka Marek, Raczyński Lech, Rudy Zbigniew, Rundel Oleksandr, Sharma Neha Gupta, Silarski Michał, Słomski Artur, Strzelecki Adam, Wiślicki Wojciech, Zieliński Marcin, Moskal Paweł
| Format: | Article |
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| Diterbitkan: | Sciendo 2015-12-01 |
Deskripsi
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.