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Measurement of Reactor Antineutrino Oscillations with 1.46 Kilotonne-Years of Data at SNO+

M. Abreu1,2, A. Allega3, M. R. Anderson3, S. Andringa1, D. M. Asner4,5, D. J. Auty6, A. Bacon7, T. Baltazar1,2, F. Barão1,2 et al. (SNO+ Collaboration)

F. Barão1,2, N. Barros8,9, R. Bayes3, E. W. Beier7, A. Bialek4,10, S. D. Biller11, E. Caden4,10, M. Chen3, S. Cheng3, B. Cleveland4,10, D. Cookman12, J. Corning3, S. DeGraw11, R. Dehghani3, J. Deloye10, M. M. Depatie3, C. Dima13, J. Dittmer14, K. H. Dixon12, M. S. Esmaeilian6, E. Falk13, N. Fatemighomi4, R. Ford4,10, S. Gadamsetty15,16, A. Gaur6, D. Gooding17, C. Grant17, J. Grove3, S. Hall4, A. L. Hallin6, D. Hallman10, M. R. Hebert15,16, W. J. Heintzelman7, R. L. Helmer18, C. Hewitt11, B. Hreljac3, P. Huang11, R. Hunt-Stokes11, A. S. Inácio11, C. J. Jillings4,10, S. Kaluzienski3, T. Kaptanoglu15,16, J. Kladnik1,19, J. R. Klein7, L. L. Kormos20, B. Krar3, C. Kraus4, T. Kroupová7, C. Lake10, L. Lebanowski15,16, C. Lefebvre3, V. Lozza1,19, M. Luo7, S. Maguire4, A. Maio1,19, S. Manecki4,3, J. Maneira1,19, R. D. Martin3, N. McCauley21, A. B. McDonald3, C. Mills13, G. Milton11, D. Morris3, I. Morton-Blake11, M. Mubasher6, S. Naugle7, L. J. Nolan10, H. M. O’Keeffe20, G. D. Orebi Gann15,16, S. Ouyang22,23, J. Page3,13, S. Pal3, K. Paleshi10, W. Parker11, L. J. Pickard15,16, R. C. Pitelka7, B. Quenallata24,25, P. Ravi10, A. Reichold11, S. Riccetto3, J. Rose21, R. Rosero5, J. Shen7, J. Simms11, P. Skensved3, M. Smiley15,16, R. Tafirout18, B. Tam11, J. Tseng11, E. Vázquez-Jáuregui26, C. J. Virtue10, F. Wang22,23, M. Ward3, J. D. Wilson6, J. R. Wilson12, A. Wright3, S. Yang6, Z. Ye7, M. Yeh5, S. Yu3, Y. Zhang22,23, K. Zuber14,27, and A. Zummo7 (SNO+ Collaboration)

  • 1Laboratório de Instrumentação e Física Experimental de Partículas (LIP), Avenida Professor Gama Pinto, 2, 1649-003, Lisboa, Portugal
  • 2Universidade de Lisboa, Instituto Superior Técnico (IST), Departamento de Física, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
  • 3Queen’s University, Department of Physics, Engineering Physics and Astronomy, Kingston, Ontario K7L 3N6, Canada
  • 4SNOLAB, Creighton Mine No. 9, 1039 Regional Road 24, Sudbury, Ontario P3Y 1N2, Canada
  • 5Brookhaven National Laboratory, P.O. Box 5000, Upton, New York 11973-500, USA
  • 6University of Alberta, Department of Physics, 4-181 CCIS, Edmonton, Alberta T6G 2E1, Canada
  • 7University of Pennsylvania, Department of Physics and Astronomy, 209 South 33rd Street, Philadelphia, Pennsylvania 19104-6396, USA
  • 8LIP—Laboratório de Instrumentação e Física Experimental de Partículas, Escola de Ciências, Campus de Gualtar, Universidade do Minho, 4701-057 Braga, Portugal
  • 9Departamento de Fisica, Universidade do Minho, 4710-057 Braga, Portugal
  • 10Laurentian University, School of Natural Sciences, 935 Ramsey Lake Road, Sudbury, Ontario P3E 2C6, Canada
  • 11University of Oxford, The Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, United Kingdom
  • 12King’s College London, Department of Physics, Strand Building, Strand, London, WC2R 2LS, United Kingdom
  • 13University of Sussex, Physics and Astronomy, Pevensey II, Falmer, Brighton, BN1 9QH, United Kingdom
  • 14Technische Universität Dresden, Institut für Kern und Teilchenphysik, Zellescher Weg 19, Dresden, 01069, Germany
  • 15University of California, Berkeley, Department of Physics, California 94720, Berkeley, USA
  • 16Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720-8153, USA
  • 17Boston University, Department of Physics, 590 Commonwealth Avenue, Boston, Massachusetts 02215, USA
  • 18TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
  • 19Universidade de Lisboa, Faculdade de Ciências (FCUL), Departamento de Física, Campo Grande, Edifício C8, 1749-016 Lisboa, Portugal
  • 20Lancaster University, Physics Department, Lancaster, LA1 4YB, United Kingdom
  • 21University of Liverpool, Department of Physics, Liverpool, L69 3BX, United Kingdom
  • 22Research Center for Particle Science and Technology, Institute of Frontier and Interdisciplinary Science, Shandong University, Qingdao 266237, Shandong, China
  • 23Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education, Shandong University, Qingdao 266237, Shandong, China
  • 24Laboratório de Instrumentação e Física Experimental de Partículas, Rua Larga, 3004-516 Coimbra, Portugal
  • 25Universidade de Coimbra, Departamento de Física (FCTUC), 3004-516, Coimbra, Portugal
  • 26Universidad Nacional Autónoma de México (UNAM), Instituto de Física, Apartado Postal 20-364, México D.F., 01000, México
  • 27MTA Atomki, 4001 Debrecen, Hungary

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Phys. Rev. Lett. 137, 101807 – Published 4 September, 2026

DOI: https://doi.org/10.1103/mv5z-pfb7

Abstract

The SNO+ Collaboration reports new results on reactor antineutrino oscillations using data acquired from May 2022 through July 2025. The spectral analysis of a flux dominated by nuclear reactors at 240, 340, and 350 km yields the mass-squared difference Δm212=(7.91−0.25+0.22)×10−5  eV2. This result is compatible with and approaches the precision of the only other long-baseline reactor antineutrino measurement, by KamLAND. Combining these measurements, along with those from solar neutrino experiments, the global values of the neutrino mixing parameters become Δm212=(7.59±0.17)×10−5  eV2 and sin2θ12=0.310±0.012. The analysis of geoneutrinos at SNO+ is also improved, with a measured signal of 48−12+14 TNU.

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References (27)

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Outline

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Phys. Rev. Lett. 137, 101807– Published 4 September, 2026
  • Received 17 November 2025
  • Revised 10 July 2026
  • Accepted 28 July 2026
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