Physics – Instrumentation and Detectors
Scientific paper
2012-01-10
JINST 7 (2012) P02010
Physics
Instrumentation and Detectors
Submitted to the Journal of Instrumentation on december 26th 2011
Scientific paper
10.1088/1748-0221/7/02/P02010
Silicon photomultipliers (SiPM) are the photon detectors chosen for the tracking readout in NEXT, a neutrinoless {\beta}{\beta} decay experiment which uses a high pressure gaseous xenon time projection chamber (TPC). The reconstruction of event track and topology in this gaseous detector is a key handle for background rejection. Among the commercially available sensors that can be used for tracking, SiPMs offer important advantages, mainly high gain, ruggedness, cost-effectiveness and radio-purity. Their main drawback, however, is their non sensitivity in the emission spectrum of the xenon scintillation (peak at 175 nm). This is overcome by coating these sensors with the organic wavelength shifter tetraphenyl butadienne (TPB). In this paper we describe the protocol developed for coating the SiPMs with TPB and the measurements performed for characterizing the coatings as well as the performance of the coated sensors in the UV-VUV range.
Agramunt J.
Álvarez Victor
Ball Mahlon
Batallé M.
Bayarri J.
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