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Future Reactor Neutrino Physics

The International Workshop on RENO-50, held on June 13-14, 2013, presented significant findings in reactor neutrino physics, highlighting the advances in understanding the mixing angle θ13 from various reactor experiments, including Daya Bay and Double Chooz. This workshop emphasized reactor neutrinos as precise and cost-effective sources for measuring θ13, exploring phenomena such as CP violation and mass hierarchy. The collaborative results anticipated an improvement in measurement precision, shedding light on potential sterile neutrinos and the reactor anomaly.

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Future Reactor Neutrino Physics

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  1. Future Reactor Neutrino Physics Soo-Bong Kim (KNRC, Seoul National University) “International Workshop on RENO-50, June 13-14, 2013”

  2. Yonggwang Reactor Neutrinos Reactor Neutrinos Nuclear Power Plants ~5×1021 n/sec • Cost-free, intense, low-energy & well-known neutrino source !

  3. Reactor Antineutrino Oscillation Daya Bay Double Chooz RENO

  4. Reactor 13 Experiments RENO at Yonggwang, Korea Double Chooz at Chooz, France Daya Bay at Daya Bay, China

  5. A Brief History of q13 from Reactor Experiments • Nov. 2011 (Double Chooz ) sin2(2q13) = 0.086±0.051 • March 2012 (Daya Bay) (5.2 s) sin2(2q13) = 0.092±0.017 Daya Bay Oct. 2012 (4.9 s) • March 2013 (RENO) • April 2012 (RENO) RENO Mar. 2013 sin2(2q13) = 0.100±0.018 sin2(2q13) = 0.113±0.023 • June 2012 (Double Chooz) sin2(2q13) = 0.109±0.039 • Oct. 2012 (Daya Bay) sin2(2q13) = 0.089±0.011 • Double-CHOOZ, arXiv:1207.6632, (2012)

  6. 13from Reactor and Accelerator Experiments * Reactor - Clean measurement of 13 with no matter effects * Accelerator - mass hierarchy + CP violation + matter effects Precise measurement of 13 • Complementary : • Combining results from accelerator and reactor based experiments could offer the first glimpse of CP.

  7. Future Precision Measurement of q13 • statistical error : ±0.010 → ±0.006 • systematic error : ±0.015 → ±0.005 • (5 years) • (402 days) • (8% precision) • (18 % precision) • (138days) • (5 years) • (12.5 % precision) • (4% precision) • Near detector (spring of 2014) • (5 years) • (35.8 % precision) • (10% precision)

  8. Expected Results from Current Reactor Experiments • sin2(2q13) to 4~5% accuracywithin 3 years : • → determination of CP phase with accelerator results • Dm231 directly from reactor neutrinos : • ← spectral disappearance of reactor antineutrinos • precision reactor antineutrino spectra : • → study reactor anomaly or sterile neutrinos

  9. Reactor Anomaly ? (3n vs. 4n) • Reactor nuclear physics vs. new physics? adapted from Lasserre AAP 2012 3n 4n Reactor q13 far detector (1-2 km) Average = 0.935 ±0.024 Reactor q13 near detector (0.3-0.4 km) • ~0.5M events at RENO (~0.1% stat. error) 10 m 100 m 1 km 10 km 100 km

  10. NUCIFER SCRAAM Stereo POSEIDON Neutrino4 Hanaro-SBL DANSS Ricochet

  11. 2012 Particle Data Book • Precise measurement of q12 and Dm221 at ~50 km in a year in 2~3 years (← 5.4%) (← 2.6%) (±2.8%) (±2.7%) (±3.1%) • (+5.2-3.4%) sin2q12 = 0.312±0.017 (±5.4%) (±13.3%) sin2q23 = 0.42+0.08−0.03 (+19.0 -7.1%) ∆m212 / |∆m31(32)2| ≈ 0.03 sin2q13 = 0.0251±0.0034 (±13.5%)

  12. 1stDm221Maximum (L~50km) ; precise value of 12&Dm221 + mass hierarchy (Dm231) Large Deficit Precise q12 Ripple Mass Hierarchy

  13. Near Detector Far Detector RENO-50 10 kton LS Detector ~47 km from YG reactors Mt. Guemseong (450 m) ~900 m.w.e. overburden

  14. Daya Bay II Site Candidate

  15. Daya Bay II Site Candidate (other option) Lufeng NPP planned 6x2.9GW

  16. Closing Remarks • A clear disappearance of reactor antineutrinos is observed. The smallest mixing angle of q13 is firmly (to 13~18% precision) measured by the reactor experiments. • The mixing angle of q13 expects to be measured to ~5% precision within 3 years. This will provide the first glimpse of CP. if accelerator results are combined. • Reactor neutrino experiments will make accurate measurements of reactor neutrino fluxes and spectra to search for sterile neutrinos. • Longer baseline (~50 km) reactor experiments is under pursuit to perform high-precision measurements of q12, Dm221, & Dm231 , and to determine the mass hierarchy.

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