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Event-by-Event Direction Reconstruction of Solar Neutrinos in a High Light-Yield Liquid Scintillator

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arxiv 2309.06341 v2 pith:QFEF7QGA submitted 2023-09-12 hep-ex physics.ins-det

A. Allega , M. R. Anderson , S. Andringa , J. Antunes , M. Askins , D. J. Auty , A. Bacon , J. Baker
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N. Barros F. Barão R. Bayes E. W. Beier T. S. Bezerra A. Bialek S. D. Biller E. Blucher E. Caden E. J. Callaghan M. Chen S. Cheng B. Cleveland D. Cookman J. Corning M. A. Cox R. Dehghani J. Deloye M. M. Depatie F. Di Lodovico J. Dittmer K. H. Dixon E. Falk N. Fatemighomi R. Ford A. Gaur O. I. Ganzálaz-Reina D. Gooding C. Grant J. Grove S. Hall A. L. Hallin W. J. Heintzelman R. L. Helmer C. Hewitt B. Hreljac V. Howard J. Hu R. Hunt-Stokes S. M. A. Hussain A. S. Inácio C. J. Jillings S. Kaluzienski T. Kaptanoglu P. Khaghani H. Khan J. R. Klein L. L. Kormos B. Krar C. Kraus C. B. Krauss T. Kroupová C. Lake L. Lebanowski J. Lee C. Lefebvra Y. H. Lin V. Lozza M. Luo A. Maio S. Manecki J. Maneira R. D. Martin N. McCauley A. B. McDonald C. Mills G. Milton I. Morton-Blake M. Mubasher A. Molina Colina D. Morris S. Naugle L. J. Nolan H. M. O'Keeffe G. D. Orebi Gann J. Page K. Paleshi W. Parker J. Paton S. J. M. Peeters L. Pickard P. Ravi A. Reichold S. Riccetto M. Rigan J. Rose R. Rosero J. Rumleskie I. Semenec P. Skensvard M. Smiley J. Smith R. Svoboda B. Tam J. Tseng S. Valder E. Vázquez-Jáuregui C. J. Virtue J. Wang M. Ward J. R. Wilson J. D. Wilson A. Wright J. P. Yanez S. Yang M. Yeh Z. Ye S. Yu Y. Zhang K. Zuber A. Zummo (The SNO+ Collaboration)
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classification hep-exphysics.ins-det
keywords directionscintillatorliquidsolartimebeendetectordirectional
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The direction of individual $^8$B solar neutrinos has been reconstructed using the SNO+ liquid scintillator detector. Prompt, directional Cherenkov light was separated from the slower, isotropic scintillation light using time information, and a maximum likelihood method was used to reconstruct the direction of individual scattered electrons. A clear directional signal was observed, correlated with the solar angle. The observation was aided by a period of low primary fluor concentration that resulted in a slower scintillator decay time. This is the first time that event-by-event direction reconstruction in high light-yield liquid scintillator has been demonstrated in a large-scale detector.

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