Reactor Neutrino ExperimentsEuropean Strategy for Future Neutrino PhysicsOctober 1st 2009Thierry Lasserre CEA/Saclay/DSM/IRFU SPP & APC

SNO+BorexinoKamLAND

T. Lasserre 01/10/2009*MeV Reactor Neutrinos Electron antineutrinos Emitted through Decays of Fission ProductsFP of: 235U, 238U, 239Pu, 241Pu

Luminosity

t0: ~3.5% 235U, 96.5% 238U: reactor constant

k : burn up dependent correction up to 10%

Fission parameters235U239PuE/fission (MeV)193.5198.9 above threshold (MeV)2.942.84N/fission above threshold1.921.45 (10-43 cm2)3.202.76

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T. Lasserre 01/10/2009*Backgrounds & Signal Prompt e+ (1-8 MeV) Delayed n Gd-capture (8 MeV)Time correlation: 30 s Space correlation:

133(Mass)2e|Uei|2|Ui|2|Ui|2matm2 = 3.10-3 eV2msol2 = 8.10-5 eV212

T. Lasserre 01/10/2009*Underlying -Oscillation PhysicsWWde+ue-Uei*UeiduReactor coreTarget H

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T. Lasserre 01/10/2009* P(e e) = 1-sin2(213)sin2(m231L/4E) The experimental concept for 13Nuclear Power Station Near detecto(s)Far detector(s)

Double Chooz120 m.w.e.300 m.w.e.4.27 GWthReactorDetector

Double Chooz130 physicists 35 laboratories

T. Lasserre 01/10/2009*Chooz site in French ArdennesFarNearIso - Near/Far flux

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T. Lasserre 01/10/2009*- Laboratory status: Site of the CHOOZ experiment Integration ongoing

Features: 1 km baseline (15 000 y-1) 300 m.w.e. (hill topology) -Rate: ~20 Hz @IV ISO 6 Clean Room

Liquid storage building: Liquids delivery in Nov/DecLiquid Storage BuildingFar Site StatusSafety files accepted by French authorities (ASN)(14C)

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T. Lasserre 01/10/2009*Near Site Status100 mHill side- Status: - Fully Funded (7 partners)- Site Engineering Study Completed - Complementary bore hole study in Oct. - Schedule: laboratory delivery mid-2011

- Features: - 400 m from nuclear cores (150 000 y-1) - A 155 m tunnel to access the new lab - 115 m.w.e (almost flat topology) - -Rate: ~250 Hz @IV

Schiste-Gres rock

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T. Lasserre 01/10/2009*Outer Veto: plastic scintillator strips (400 mm)

-Target: 10,3 m3 scintillator doped with 0,1g/l of Gd compound in an acryclic vessel (8 mm)

-Catcher: 22,3 m3 scintillator in an acrylic vessel (12 mm)

Buffer: 110 m3 of mineral oil in a stainless steel vessel (3 mm) viewed by 390 PMTs

Inner Veto: 90m3 of scintillator in a steel vessel equipped with 78 PMTs

Veto Vessel (10mm) & Steel Shielding (150 mm)DetectorDesignNew 4-region large detector concept from Double Chooz Coll. (2003)http://bama.ua.edu/~busenitz/rnu2003_talks/lasserre1.doc (4 liquid densities adjusted at 0,8000,005)

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T. Lasserre 01/10/2009*Detector Calibration Systems

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T. Lasserre 01/10/2009*250 ton Steel Shielding

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T. Lasserre 01/10/2009*Inner Muon Veto

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T. Lasserre 01/10/2009*Inner Veto PMTs & Buffer Vessel

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T. Lasserre 01/10/2009*5/6 PMT Integration Completed

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T. Lasserre 01/10/2009*Acrylic Vessels

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T. Lasserre 01/10/2009*Integration Ongoing

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T. Lasserre 01/10/2009*Detector Filling 250 m3 of liquid scintillator & mineral oil 22 m3 Gd-Scintillator ready to be mixed Complex filling system to be installed by January 2010 Target Weighing measurement @0,2% to control the number of free H

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T. Lasserre 01/10/2009*Sensitivity (Limit) Timelinem2atm = 2.5 10-3 eV2 (20% uncertainty)sys=2.5%sys=0.6%Excluded by CHOOZ

Efficiencies included

1% bin-bin uncorrelated error on background subtraction.

Systematics 1Det = CHOOZ

Systematics 2Det: - abs = 2.0% - rel = 0.6% - scl = 0.5% - shp = 2.0% - m2= 20%012345years

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2009 Far detector construction & intgration

04/2010 Start of phase I : Far 1 km detector alone sin2(213) < 0.06 after 1,5 y (90% C.L.) if no-oscillation

2010/11 Near Lab Excavation Near Detector Integration

2011 Start of phase II : both near and far detectors sin2(213) < 0.03 after 3 y (90% C.L.) if no-oscillationDouble Chooz Status

Daya Bay255 m.w.e.291 m.w.e.923 m.w.e.2.9 GWthReactorDetectorDaya Bay nuclear power station in ChinaCourtesy : K.. Luk>3 km tunnelNew surface infrastructure3 laboratory hall8 detectorsGd-volume: 200 m3

*Status of Daya BayDetector mechanics: 5-m SST vessel, 4-m and 3-m acrylic vessels in assembly hallConstruction of near hallAccess tunnel to the underground halls well advancedT. Lasserre 01/10/2009

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*Sensitivity & Milestones of Daya BaySensitivity in sin2213:

sin2213 < 0.01 @ 90% CL in 3 years of data taking Aug 2009: Begin detector assembly

Fall 2009: Begin detector installation in experimental halls

Fall 2010: Start data taking with first near hall

Summer 2011: Start data taking with all detectors0.38% relative detector syst. uncertaintym231 = 2.5 103 eV2

RENO230 m.w.e.675 m.w.e.2.73 GWthReactorDetectorYong gwang nuclear power station in Korea Courtesy : S. B. Kim2 detectorsGd-volume: 40 m3

Near & far tunnels are completedby Daewoo Eng. Co. Korea(2008.6~2009.3)*

Buffer steel tanks are installedby NIVAK Co. Korea(2009.6~2009.9)*

Status Report of RENO RENO is suitable for measuring sin2(213) > 0.02 Acrylic containers will be completed until Nov. 2009

Civil construction completed International collaborators are being invited Data taking is expected to start in mid 2010 Buffer steel containers are installed PMT installation start in Dec. 09*

12

Connecting the v1 v2 (solar) neutrino pair with the electron flavor Already KamLAND, Borexino, SNO+? A new disapearance experiment located at the oscillation maximum :

Sensitivity (see Phys. Rev. D 71, 013005 2005) Exposure: 60 GWth . Ton . Year 4% systematics, error on sin2(12) : 2% (1)

No project funded but a few sites have been discussed: Sado Island (Japan), 55 km from Kashiwasaki power plant San Onofre (US), with the Hano Hano detector underwater Rustrel (500 mwe, France), Cruas (12 GW, 73 km), Tricastin (12 GW, 59 km)Reactor Measurement of 12 Nos/Nnoosc1T. Lasserre 01/10/2009

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A reactor neutrino community in Europe

Prospect on 13 Double Chooz, based in Europe Daya Bay & Reno, based in Asia Start data taking in 2010 Constraint on sin2(213) ~ 0.01-0.03 by 2014

Prospect on 12 An efficient possibility getting sin2(12) @2% (1) Needed?Conclusion and Outlook1T. Lasserre 01/10/2009

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T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*The Standard Model interactions between neutrinos and matter do not change neutrino flavor. Neutrino flavor change implies neutrino mass & mixing.U is the Leptonic Mixing Matrix. U is unitary.The neutrino state |> produced together with l > = Ui |i> The probability of atmospheric flavor change is observed to depend on L/E.Apart from a proportionality constant, L/E is just the time elapsed in the rest frame during its journey.

T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*T.L 04/05/2006T.L 04/05/2006*Commentaire 1

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