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Heeger theta13, May 8 2003 A Neutrino Project at Diablo Canyon.

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Presentation on theme: "Heeger theta13, May 8 2003 A Neutrino Project at Diablo Canyon."— Presentation transcript:

1 Heeger theta13, May A Neutrino Project at Diablo Canyon

2 Heeger theta13, May Underground Neutrino Detectors and Locations Solar (SNO) Reactor (KamLAND) Accelerator (LSND) Atmospheric (Super-K) at national laboratories in an old mine in Japan in a nickel mine in Canada

3 Heeger theta13, May Sudbury Neutrino Observatory 1,000 t ultrapure heavy water in clean room environment 6800 ft underground 9500 photomultipliers

4 Heeger theta13, May KamLAND Balloon Steel Sphere Calibration Deck 1,000 t of liquid scintillator Flammable and toxic

5 Heeger theta13, May Diablo Canyon Site

6 Heeger theta13, May Location Diablo Canyon powerplant in San Luis Obispo county

7 Heeger theta13, May Diablo Canyon From South East From North East

8 Heeger theta13, May Diablo Canyon From South East

9 Heeger theta13, May Powerful: Two reactors ( GW E th ) 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. Diablo Canyon Site 1500 ft 600 ft

10 Heeger theta13, May Possible Locations for Near Detector Space constrained by hills and infrastructure Best overburden to the North East of the powerplant Distances of near detector: > 0.4 km

11 Heeger theta13, May Possible Locations for Near Detector Space constrained by hills and infrastructure Best overburden to the North East of the powerplant Distances of near detector: > 0.4 km

12 Heeger theta13, May Far Detector Possible location Crowbar Canyon Parallel to Diablo Canyon Existing road access Possibility for good overburden Tunnels in radial direction from reactor

13 Heeger theta13, May ~ mwe FAR II: distance km FAR I: distance km NEAR: distance~ 0.5 km tunnels ~ 400 mwe A Reactor Neutrino Oscillation Experiment with Fixed Detectors or Variable Baseline  Excavation required

14 Heeger theta13, May Possible Movable Detector for Diablo Canyon Modular, movable liquid scintillator detector active muon veto V fiducial ~ t

15 Heeger theta13, May Diablo Canyon Project Some Detector Issues Excavation required Hazardous materials Some Site Issues Environmental impact (statepark and conservation area nearby) Indian burial grounds on PG&E site Status Negotiations with PG&E are underway What are the issues? What is unique to Diablo Canyon? What is the process for environmental impact studies?

16 Heeger theta13, May

17 Heeger theta13, May Sensitivity and Complementarity of  13 Experiments Reactor  13 experiment No matter effect Correlations are small, no degeneracies Independent of solar osc. parameters  12,  m 21 2 sin 2 2  13 sensitivity limit  m 2 13 dependence True value of  m 2 31 (eV 2 ) Sensitivity to sin 2 2  Ref: Huber et al., hep-ph/  13 sensitivity of reactor experiments comparable to JHF-SK

18 Heeger theta13, May Reactor Neutrino Measurement of  13 Detector 1 Detector 2 Searching for Subdominant Oscillations in e  ,  to measure the last yet undetermined neutrino mixing angle,  13  13 oscillation signature

19 Heeger theta13, May  13 and CP Violation ? Neutrino Mixing Matrix  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 is key parameter for oscillation phenomenology since  12 and  23 are both large  13 determines whether CP violation is accessible CP proportional to  13 atmospheric present solar present reactor and accelerator future 0  experiments future

20 Heeger theta13, May Movable detectors? Does a site like this exist? 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) A  13 Reactor Experiment in the US ?


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