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Pablo DEL AMO SANCHEZ Henri PESSARD 18/12/2012
Demande ANR STEREO Pablo DEL AMO SANCHEZ Henri PESSARD 18/12/2012
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
Overview Neutrino anomalies The STEREO experiment ANR request LAPP’s contribution Conclusions 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
Open questions in oscillation physics Oscillations extremely successful description of ν flavour change during propagation, θ13 just measured! Mass hierarchy and leptonic CP in ~ 2025 (LAGUNA/LBNO) Meanwhile, some open questions: Anomaly Type Significance Gallium νe disappearance 2.7σ Reactor 3.0σ LSND νμ → νe 3.8σ MiniBoone 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Gallium anomaly GALLEX and SAGE experiments looked for low energy solar neutrinos using Gallium-based detectors (νe+71Ga → e–+71Ge) Deficit observed during calibration runs: Robs/pred=0.86±0.05 (Bahcall’s σν) Detectors calibrated with ~MCi νe sources 0.86 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
Reactor anomaly Reactor ν spectrum predicted from β spectrum → compare w/ experiment Emitted b spectra per fission THEORY!!! ν spectra per fission Comparison 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
Reactor anomaly Reactor antineutrino flux re-evaluated (2011): % Phys.Rev. C83 (2011) & Phys.Rev. C84 (2011) Neutron lifetime decrease → σν(Inverse Beta Decay) increase % Previously non-accounted long-lived isotopes in reactors % 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
Reactor anomaly → Re-analyse reactor neutrino experiments Result: 7% less events than expected! (3.0 σ) Can be explained with a sterile neutrino with Losc ~ 2-10m Robs/pred=0.927±0.023 Phys.Rev. D83 (2011) 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Reactor+Ga anomalies fit
Both reactor and Ga anomalies can be explained by 1 sterile ν Δm2 ~ 2 eV2 sin2(2θee) ~ 0.2 Losc ~ 7m Phys.Rev. D83 (2011) 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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 ~ Losc ~ 10 m) Reactor core size important – large cores wash out oscillation Grenoble’s ILL most compact! 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
2m3 Gd-doped liquid scintillator detector 8m away of ILL reactor Signature: νe+p→e++n Segmented target to see L/E dependence at different L’s 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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/ ILL Scientific Committee Design & construction Installation at ILL Physics Run ergewqrg 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
ANR Proposal Porteur: David LHUILLIER (CEA Saclay) 800 k€ + 2 postdocs (+1 ENIGMASS postdoc => 1postdoc/french lab) Timescale: 04/ ANR funding decision Design & construction Late Lab tests Installation at ILL Physics Run 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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 m-veto - water 10 cm lead Polyethylene Tube 20 cm acrylic buffer 10 cm lead front wall Source 5 target cells 40 cm thick 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie ~ 3.30 m
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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
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Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
BACKUP SLIDES 18/12/2012 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie
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