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Demande ANR STEREO Pablo DEL AMO SANCHEZ Henri PESSARD 18/12/2012.

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Presentation on theme: "Demande ANR STEREO Pablo DEL AMO SANCHEZ Henri PESSARD 18/12/2012."— Presentation transcript:

1 Demande ANR STEREO Pablo DEL AMO SANCHEZ Henri PESSARD 18/12/2012

2 Overview 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 2 Neutrino anomalies The STEREO experiment ANR request LAPP’s contribution Conclusions

3 Open questions in oscillation physics Oscillations extremely successful description of ν flavour change during propagation, θ 13 just measured! Mass hierarchy and leptonic CP in ~ 2025 (LAGUNA/LBNO) Meanwhile, some open questions: 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 3 AnomalyTypeSignificance Galliumν e disappearance2.7σ Reactorν e disappearance3.0σ LSNDν μ → ν e 3.8σ MiniBooneν μ → ν e 3.0σ

4 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 4 Gallium anomaly GALLEX and SAGE experiments looked for low energy solar neutrinos using Gallium-based detectors (ν e + 71 Ga → e – + 71 Ge) Deficit observed during calibration runs: R obs/pred =0.86±0.05 (Bahcall’s σ ν ) Detectors calibrated with ~MCi ν e sources 0.86

5 Reactor anomaly Reactor ν spectrum predicted from β spectrum → compare w/ experiment 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 5 Emitted  spectra per fission ν spectra per fission THEORY!!! Comparison

6 Reactor anomaly Reactor antineutrino flux re-evaluated (2011): +3.5% 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 6 Neutron lifetime decrease → σ ν (Inverse Beta Decay) increase +1% Previously non-accounted long-lived isotopes in reactors +1% Phys.Rev. C83 (2011) & Phys.Rev. C84 (2011)

7 Reactor anomaly → Re-analyse reactor neutrino experiments Result: 7% less events than expected! (3.0 σ) Can be explained with a sterile neutrino with L osc ~ 2-10m 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 7 R obs/pred =0.927±0.023 Phys.Rev. D83 (2011)

8 Reactor+Ga anomalies fit Both reactor and Ga anomalies can be explained by 1 sterile ν 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 8 Δm 2 ~ 2 eV 2 sin 2 (2θ ee ) ~ 0.2 L osc ~ 7m Phys.Rev. D83 (2011)

9 Future experiments Several reactor (short term), sources (short term) & accelerator (mid-term) experiments under consideration Probe Reactor+Ga anomalies and sterile ν at the same time: – Measure rate of reactor – Look at L/E dependence close to reactor (L ~ L osc ~ 10 m) Reactor core size important – large cores wash out oscillation 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 9 Grenoble’s ILL most compact!

10 18/12/2012 STEREO 2m 3 Gd-doped liquid scintillator detector 8m away of ILL reactor 10 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie Signature: ν e +p→e + +n Segmented target to see L/E dependence at different L’s

11 STEREO STEREO should see sterile ν oscillation if it’s there Good performance compared to competition (timing important!) Liquid scintillator technology well known (DoubleChooz, Nucifer) Potentially big impact Cheap : ~ 1,5 M€ Quick experiment! Timeline: 11/2012 ILL Scientific Committee Design & construction 2015 Installation at ILL Physics Run ergewqrg 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 11

12 STEREO Collaboration ILL, host laboratory: site characterisation. Three French laboratories: – CEA Saclay: Inner detector – LAPP: Radioactive source calibration system + possibility of mechanics of shielding – LPSC: Acquisition electronics + µ veto + shieldings (workshop) Foreign collaborators: – Germany, TUM & Max-Plank-Institut Heidelberg: Liquid scintillator + LED calibration system – Morocco, University Hassan II & CNESTEN. 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 12

13 ANR Proposal Porteur: David LHUILLIER (CEA Saclay) 800 k€ + 2 postdocs (+1 ENIGMASS postdoc => 1postdoc/french lab) Timescale: 04/2013 ANR funding decision Design & construction Late 2014 Lab tests 2015 Installation at ILL Physics Run 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 13

14 LAPP’s contribution Calibration system with radioactive sources γ sources (Na, Co, n capture by H & Gd)+ n sources (Am-Be) Mechanics + automatism + workshop – In touch with B. Lieunard – ITA manpower under evaluation, seems feasible Possibility of engineering shielding support under study 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 14  -veto - water 10 cm lead front wall Polyethylene 5 target cells 40 cm thick 10 cm lead ~ 3.30 m 20 cm acrylic buffer Tube Source

15 Conclusions Strong international interest in neutrino anomalies Grenoble’s ILL unique for Reactor+Gallium anomalies STEREO has the potential to address Reactor+Gallium anomalies in a short (~5yr) timescale; excellent bang for buck! ANR request (CEA, LAPP, LPSC): 800 k€ + 2 postdocs LAPP’s rôle : Radioactive source calibration system. Possibility of mechanics of shielding. Engineering manpower seems available for the requested period 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 15

16 BACKUP SLIDES 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie 16


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