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Reactor Neutrino Measurement of  13

Measuring the Last Undetermined Neutrino Mixing Angle  13 Searching for Subdominant Oscillations in  e   ,. Reactor Neutrino Measurement of  13.  13 is key parameter for oscillation phenomenology since  12 and  23 are both large

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Reactor Neutrino Measurement of  13

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  1. Measuring the Last Undetermined Neutrino Mixing Angle 13 Searching for Subdominant Oscillations in e  , Reactor Neutrino Measurement of 13 NSD, May 1, 2003

  2. 13 is key parameter for oscillation phenomenology since 12 and 23 are both large 13 determines whether CP violation is accessible CP proportional to 13 ? 13 and CP Violation Neutrino Mixing Matrix solar  present 0 experiments future reactor and accelerator  future atmospheric  present NSD, May 1, 2003

  3. Detector 2 Detector 1 Reactor Neutrino Measurement of 13 Searching for Subdominant Oscillations in e  , to measure the last yet undetermined neutrino mixing angle, 13 13 oscillation signature NSD, May 1, 2003

  4. m213 dependence True value of m231 (eV2) sin2213 sensitivity limit Sensitivity and Complementarity of 13Experiments Reactor 13experiment No matter effect Correlations are small, no degeneracies Independent of solar osc. parameters 12,m212 Sensitivity to sin2213 Ref: Huber et al., hep-ph/0303232 10-3 10-2 10-1 13sensitivity of reactor experiments comparable to JHF-SK NSD, May 1, 2003

  5. A 13Reactor Experiment in the US ? Site Requirements 1. A reactor, or multiple-reactor complex 2. Sites for 2-3 detectors at distances of 1-5 km from reactor 3. Detector overburden for reduction of cosmic ray background • Man-made overburden or • Underground site in a mine (good overburden) • Underground site in tunnels (movable detectors) Movable detectors? Does a site like this exist? NSD, May 1, 2003

  6. Diablo Canyon - An Ideal Site? NSD, May 1, 2003

  7. Diablo Canyon Site 1500 ft 600 ft • Powerful: Two reactors (3.1+3.1 GW Eth) on the California coast • Overburden: Horizontal tunnel could give 800 mwe shielding! • Infrastructure: Roads built for heavy machinery. Controlled access. • Scientific Collaborations: existing collaborations between PG&E and marine scientists, biologists, and geologists with site access. NSD, May 1, 2003

  8. An Ideal Oscillation Experiment with Variable Baseline?Possible layout of 2 or 3 detectors at Diablo Canyon FAR II: distance 2-2.5 km FAR I: distance 1.5-2 km tunnels NEAR: distance~ 0.5 km ~ 600-800 mwe ~ 400 mwe Tunnel excavation required  further studies necessary NSD, May 1, 2003

  9. Schematic ofMovable Detector • Modular, movable liquid scintillator detector to control systematics • active muon veto • Vfiducial ~ 80-100 t NSD, May 1, 2003

  10. Summary: Reactor Measurement of 13 • Measurement of fundamental neutrino mixing angle with discovery opportunityandlong-term impact. • Reactor experiment gives clean measurement of sin2213. • Sensitivity of sin2213 < 0.005 comparable to next-generation accelerator experiments. •A timely 13 measurement will define the future of accelerator  physics. •Reactor results will be on a timescale that complements off-axis results • Further design studies and site evaluation necessary. http://theta13.lbl.gov/ NSD, May 1, 2003

  11. NSD, May 1, 2003

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