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Future Reactor Neutrino Physics

Future Reactor Neutrino Physics. Soo -Bong Kim (KNRC, Seoul National University) “International Workshop on RENO-50, June 13-14, 2013”. Yonggwang. Reactor Neutrinos. Reactor Neutrinos. Nuclear Power Plants. ~5×10 21 n /sec. Cost-free, intense, low-energy & well-known neutrino source !.

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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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