Measurement of the B8 solar neutrino flux in SNO+ with very low backgrounds
| Autor: | Jeffrey Hartnell, Laura Lee Kormos, Valentina Lozza, Simon Peeters, Teal Pershing, Nuno Barros, Janet Rumleskie, Benjamin Land, Eric Vázquez-Jáuregui, Ian Lam, Jeanne Wilson, Minfang Yeh, Jose Maneira, Aobo Li, Francesca Di Lodovico, Jan J. Weigand, Vincent Fischer, Helen Mary O'Keeffe, Fernando Barao, Benjamin Tam, José Luis Hernández Hernández, Javier Caravaca Rodriguez, Sofia Andringa, Tanner Kaptanoglu, Josephine Paton, Andrew Mastbaum, Ryan Bayes, Ana Sofia Inácio |
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| Rok vydání: | 2019 |
| Předmět: |
Elastic scattering
Physics Range (particle radiation) Physics::Instrumentation and Detectors 010308 nuclear & particles physics Solar neutrino Detector Phase (waves) Flux 7. Clean energy 01 natural sciences Nuclear physics 13. Climate action 0103 physical sciences High Energy Physics::Experiment Astrophysics::Earth and Planetary Astrophysics 010306 general physics Neutrino oscillation Event (particle physics) |
| Zdroj: | Physical Review D. 99 |
| ISSN: | 2470-0029 2470-0010 |
| Popis: | A measurement of the 8B solar neutrino flux has been made using a 69.2 kt-day dataset acquired with the SNO+ detector during its water commissioning phase. At energies above 6 MeV the dataset is an extremely pure sample of solar neutrino elastic scattering events, owing primarily to the detector’s deep location, allowing an accurate measurement with relatively little exposure. In that energy region the best fit background rate is 0.25+0.09−0.07 events/kt−day, significantly lower than the measured solar neutrino event rate in that energy range, which is 1.03+0.13−0.12 events/kt−day. Also using data below this threshold, down to 5 MeV, fits of the solar neutrino event direction yielded an observed flux of 2.53+0.31−0.28(stat)+0.13−0.10(syst)×106 cm−2 s−1, assuming no neutrino oscillations. This rate is consistent with matter enhanced neutrino oscillations and measurements from other experiments. |
| Databáze: | OpenAIRE |
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