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26 April 2024

» arxiv » 1508.6820

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PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix
A. Wieczorek ; B. Zgardzińska ; B. Jasińska ; M. Gorgol ; T. Bednarski ; P. Białas ; E. Czerwiński ; A. Gajos ; D. Kamińska ; Ł. Kapłon ; A. Kochanowski ; G. Korcyl ; P. Kowalski ; T. Kozik ; W. Krzemień ; E. Kubicz ; S. Niedźwiecki ; M. Pałka ; L. Raczyński ; Z. Rudy ; O. Rundel ; N.G. Sharma ; M. Silarski ; A. Słomski ; A. Strzelecki ; W. Wiślicki ; M. Zieliński ; P. Moskal ;
Date:	27 Aug 2015
Abstract:	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.
Source:	arXiv, 1508.6820
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