Thickness effects on the light response and pulse shape discrimination of siloxane scintillators scintillation under $H^+$ irradiation.

Pino F., Fontana C.L., Moretto S., Raggio R, Quaranta A., Zanazzi E., Chiari M., Carturan S.M.

I - Fisica nucleare e subnucleare
Aula Palazzo dell'Emiciclo - Sala B. Croce - Venerdì 27 h 15:30 - 19:00
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Siloxane scintillators composed of different matrices, with varying phenyl groups content and cross-linking mechanism, either Pt or Sn based, were prepared and irradiated with a 5 MeV $H^+$ beam extracted in air at the LABEC facility of INFN. Samples with different thickness (1 mm and 6 mm) displayed a remarkable change in the light response as compared to a standard plastic scintillator (namely EJ-212) of comparable thickness. In particular, the yield of scintillators as thin as 1 mm displayed similar values of the EJ-212 standard, while thicker samples showed a decrease in the emitted light. Moreover, the discrimination of protons and $\gamma$-rays on the basis of different light pulse shape was tested to evaluate their use as compact, lightweight and flexible detectors in revealing different impinging radiation for homeland security purposes.

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