Optical calibration of the SNO+ detector in the water phase with deployed sources

Falk, Elisabeth, Hartnell, Jeff, Mills, Charlie, Nirkko, Martti, Page, James, Peeters, Simon, Rigan, Michal and Valder, Sammy (2021) Optical calibration of the SNO+ detector in the water phase with deployed sources. Journal of Instrumentation, 16. aP10021. ISSN 1748-0221

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Abstract

SNO+ is a large-scale liquid scintillator experiment with the primary goal of searching for neutrinoless double beta decay, and is located approximately 2 km underground in SNOLAB, Sudbury, Canada. The detector acquired data for two years as a pure water Cherenkov detector, starting in May 2017. During this period, the optical properties of the detector were measured in situ using a deployed light diffusing sphere, with the goal of improving the detector model and the energy response systematic uncertainties. The measured parameters included the water attenuation coefficients, effective attenuation coefficients for the acrylic vessel, and the angular response of the photomultiplier tubes and their surrounding light concentrators, all across different wavelengths. The calibrated detector model was validated using a deployed tagged gamma source, which showed a 0.6% variation in energy scale across the primary target volume.

Item Type: Article
Keywords: Cherenkov detectors, Neutrino detectors, Detector alignment and calibration methods (lasers, sources, particle-beams), Analysis and statistical methods
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 01 Sep 2021 07:18
Last Modified: 01 Mar 2022 13:10
URI: http://sro.sussex.ac.uk/id/eprint/101377

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Project NameSussex Project NumberFunderFunder Ref
STFC Experimental Particle Physics 2018 Consolidated GrantG2740STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/S000798/1