Wavelength Shifters for Water Cherenkov Detectors

Details Wavelength Shifters for Water Cherenkov Detectors Wavelength Shifters for Water Cherenkov Detectors

2008-07-18

arxiv.org/abs/0807.2895v1

Nucl.Instrum.Meth.589:290-295,2008; Nucl.Instrum.Meth.A589:290-295,2008

Physics

Instrumentation and Detectors

13 pages, 3 figures

Scientific paper

10.1016/j.nima.2008.01.101

The light yield of a water-based Cherenkov detector can be significantly improved by adding a wavelength shifter. Wavelength shifter (WLS) molecules absorb ultraviolet photons and re-emit them at longer wavelengths where typical photomultiplier tubes are more sensitive. In this study, several wavelength shifter compounds are tested for possible deployment in the Sudbury Neutrino Observatory (SNO). Test results on optical properties and chemical compatibility for a few WLS candidates are reported; together with timing and gain measurements. A Monte Carlo simulation of the SNO detector response is used to estimate the total light gain with WLS. Finally, a cosmic ray Cherenkov detector was built to investigate the optical properties of WLS.

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