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

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arxiv 2106.03951 v2 pith:JSR7FZQ3 submitted 2021-06-07 physics.ins-det hep-exnucl-ex

SNO+ Collaboration: M. R. Anderson , S. Andringa , M. Askins , D. J. Auty , F. Barão , N. Barros , R. Bayes , E. W. Beier
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A. Bialek S. D. Biller E. Blucher M. Boulay E. Caden E. J. Callaghan J. Caravaca M. Chen O. Chkvorets B. Cleveland D. Cookman J. Corning M. A. Cox C. Deluce M. M. Depatie F. Di Lodovico J. Dittmer E. Falk N. Fatemighomi V. Fischer R. Ford K. Frankiewicz A. Gaur K. Gilje O. I. González-Reina D. Gooding C. Grant J. Grove A. L. Hallin D. Hallman J. Hartnell W. J. Heintzelman R. L. Helmer J. Hu R. Hunt-Stokes S. M. A. Hussain A. S. Inácio C. J. Jillings T. Kaptanoglu P. Khaghani H. Khan J. R. Klein L. L. Kormos B. Krar C. Kraus C. B. Krauss T. Kroupová I. Lam B. J. Land A. LaTorre I. Lawson L. Lebanowski C. Lefebvre A. Li J. Lidgard Y. H. Lin Y. Liu V. Lozza M. Luo A. Maio S. Manecki J. Maneira R. D. Martin N. McCauley A. B. McDonald M. Meyer C. Mills I. Morton-Blake S. Nae M. Nirkko L. J. Nolan H. M. O'Keeffe G. D. Orebi Gann J. Page W. Parker J. Paton S. J. M. Peeters T. Pershing L. Pickard G. Prior P. Ravi A. Reichold S. Riccetto R. Richardson M. Rigan J. Rose J. Rumleskie I. Semenec F. Shaker M. K. Sharma P. Skensved M. Smiley R. Stainforth R. Svoboda B. Tam J. Tseng E. Turner S. Valder E. Vázquez-Jáuregui J. G. C. Veinot C. J. Virtue J. Wang M. Ward J. J. Weigand J. R. Wilson A. Wright J. P. Yanez M. Yeh S. Yu T. Zhang Y. Zhang K. Zuber A. Zummo
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classification physics.ins-dethep-exnucl-ex
keywords detectordeployedwateracrossattenuationcoefficientsenergygoal
verification ladder T0 review T1 audit T2 compute T3 formal
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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.

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