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Title: Temperature Quenching in LAB based liquid scintillator

Abstract

The effect of temperature changes on the light output of LAB based liquid scintillator is investigated in a range from –5 C to 30 °C with a-particles and electrons in a small scale setup. Two PMTs observe the scintillator liquid inside a cylindrically shaped aluminum cuvette that is heated or cooled and the temperature dependent PMT sensitivity is monitored and corrected. The a-emitting isotopes in dissolved radon gas and in natural Samarium (bound to a LAB solution) excite the liquid scintillator mixtures and changes in light output with temperature variation are observed by fitting light output spectra. Furthermore, also changes in light output by compton electrons, which are generated from external calibration g-ray sources, is analysed with varying temperature. Assuming a linear behaviour, a combined negative temperature coefficient of (–0:29 0:01) % /°C is found. Considering hints for a particle type dependency, electrons show (–0:17 0:02) % /°C, whereas the temperature dependency seems stronger for a-particles, with (–0:35 0:03) % /°C. Furthermore, due to a high sampling rate, a pulse shape analysis can be performed and shows an enhanced slow decay component at lower temperatures, pointing to reduced non-radiative triplet state de-excitations.

Authors:
 [1];  [2];  [2];  [3];  [4];  [3];  [5];  [3];  [1]
  1. Technische Univ. Dresden, Dresden (Germany)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Helmholtz-Zentrum Dresden-Rossendorf, Dresden (Germany)
  4. Technische Univ. Dresden, Dresden (Germany); Dept. of Physics and Astronomy, Vancouver (Canada)
  5. Technische Univ. Dresden, Dresden (Germany); Lab. de Instrumentacao e Fisica Experimental de Particulas, Lisboa (Portugal)
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1412792
Report Number(s):
BNL-114818-2017-JA
Journal ID: ISSN 1434-6044; R&D Project: CO001; KB0401022
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 78; Journal Issue: 1; Journal ID: ISSN 1434-6044
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Sorensen, A., Yeh, M., Hans, S., Junghans, A. R., Kroslgk, B. v., Kogler, T., Lozza, V., Wagner, A., and Zuber, K. Temperature Quenching in LAB based liquid scintillator. United States: N. p., 2018. Web. doi:10.1140/epjc/s10052-017-5484-3.
Sorensen, A., Yeh, M., Hans, S., Junghans, A. R., Kroslgk, B. v., Kogler, T., Lozza, V., Wagner, A., & Zuber, K. Temperature Quenching in LAB based liquid scintillator. United States. doi:10.1140/epjc/s10052-017-5484-3.
Sorensen, A., Yeh, M., Hans, S., Junghans, A. R., Kroslgk, B. v., Kogler, T., Lozza, V., Wagner, A., and Zuber, K. Thu . "Temperature Quenching in LAB based liquid scintillator". United States. doi:10.1140/epjc/s10052-017-5484-3. https://www.osti.gov/servlets/purl/1412792.
@article{osti_1412792,
title = {Temperature Quenching in LAB based liquid scintillator},
author = {Sorensen, A. and Yeh, M. and Hans, S. and Junghans, A. R. and Kroslgk, B. v. and Kogler, T. and Lozza, V. and Wagner, A. and Zuber, K.},
abstractNote = {The effect of temperature changes on the light output of LAB based liquid scintillator is investigated in a range from –5 C to 30 °C with a-particles and electrons in a small scale setup. Two PMTs observe the scintillator liquid inside a cylindrically shaped aluminum cuvette that is heated or cooled and the temperature dependent PMT sensitivity is monitored and corrected. The a-emitting isotopes in dissolved radon gas and in natural Samarium (bound to a LAB solution) excite the liquid scintillator mixtures and changes in light output with temperature variation are observed by fitting light output spectra. Furthermore, also changes in light output by compton electrons, which are generated from external calibration g-ray sources, is analysed with varying temperature. Assuming a linear behaviour, a combined negative temperature coefficient of (–0:29 0:01) % /°C is found. Considering hints for a particle type dependency, electrons show (–0:17 0:02) % /°C, whereas the temperature dependency seems stronger for a-particles, with (–0:35 0:03) % /°C. Furthermore, due to a high sampling rate, a pulse shape analysis can be performed and shows an enhanced slow decay component at lower temperatures, pointing to reduced non-radiative triplet state de-excitations.},
doi = {10.1140/epjc/s10052-017-5484-3},
journal = {European Physical Journal. C, Particles and Fields},
number = 1,
volume = 78,
place = {United States},
year = {2018},
month = {1}
}

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