Measurement of neutrino oscillation with KamLAND: evidence of spectral distortion.

By T. Araki, K. Eguchi, S. Enomoto, K. Furuno, K. Ichimura, H. Ikeda, K. Inoue, K. Ishihara, T. Iwamoto, T. Kawashima and 83 more. Physical Review Letters, 2004

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We present results of a study of neutrino oscillation based on a 766 ton/year exposure of KamLAND to reactor antineutrinos. We observe 258 nu (e) candidate events with energies above 3.4 MeV compared to 365.2+/-23.7 events expected in the absence of neutrino oscillation. Accounting for 17.8+/-7.3 expected background events, the statistical significance for reactor nu (e) disappearance is 99.998%. The observed energy spectrum disagrees with the expected spectral shape in the absence of neutrino oscillation at 99.6% significance and prefers the distortion expected from nu (e) oscillation effects. A two-neutrino oscillation analysis of the KamLAND data gives Deltam(2)=7.9(+0.6)(-0.5)x10(-5) eV(2). A global analysis of data from KamLAND and solar-neutrino experiments yields Deltam(2)=7.9(+0.6)(-0.5)x10(-5) eV(2) and tan((2)theta=0.40(+0.10)(-0.07), the most precise determination to date.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/30cb75e7f3c1d9b32afd5e41f4ab6b07c179afae

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1. M. Tórtola
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Citations in the corpus

• Sterile neutrino oscillations after first MiniBooNE results (2007, background): “Reconciling the LSND signal with the other evidence for neutrino oscillations is a long-standing challenge for neutrino phenomenology, since it requires a mass-squared difference at the eV(2) scale, at odd with the values needed to explain atmospheric [4], longbaseline accelerator [5, 6], solar [7, ”
• Constraints on flavor-diagonal non-standard neutrino interactions from Borexino Phase-II (2019, positive): “Solar neutrino experiments, primarily SNO [1] and Super-Kamiokande [2], together with KamLAND [3–5], have resolved the solar neutrino problem with the large mixing angle (LMA) MSW flavor conversion effect [6–9].”
• Updated results on neutrino mass and mass hierarchy from cosmology with Planck 2018 likelihoods (2019, background): “Earth based neutrino oscillation experiments [1–8] have confirmed that neutrinos are massive, which is the first known departure from the Standard Model of particle physics where neutrinos are considered to be massless.”
• Large underground, liquid based detectors for astro-particle physics in Europe: scientific case and prospects (2007, background): “Until now, only the KamLAND experiment [24] has been able to study these so-called geo-neutrinos opening the way to a completely new field of research.”
• Three-flavour neutrino oscillation update (2008, result): “The latest data released from the KamLAND reactor experiment [11] have increased the exposure almost fourfold over previous results [17] to 2.”