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Demande ANR STEREO

Demande ANR STEREO. Pablo DEL AMO SANCHEZ Henri PESSARD 18/12/2012. Overview. Neutrino anomalies The STEREO experiment ANR request LAPP’s contribution Conclusions. Open questions in oscillation physics

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Demande ANR STEREO

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

  2. Overview • Neutrino anomalies • The STEREO experiment • ANR request • LAPP’s contribution • Conclusions Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  3. Open questions in oscillation physics • Oscillations extremely successful description of νflavour change during propagation, θ13justmeasured! • Mass hierarchy and leptonic CP in ~ 2025 (LAGUNA/LBNO) • Meanwhile, some open questions: 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 (νe+71Ga → e–+71Ge) Deficit observed during calibration runs: Robs/pred=0.86±0.05 (Bahcall’sσν) Detectors calibrated with ~MCiνe sources 0.86 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  5. Reactor anomaly • Reactor ν spectrum predicted from βspectrum → compare w/ experiment Emitted b spectra per fission THEORY!!! νspectra per fission Comparison Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  6. Reactor anomaly • Reactor antineutrino flux re-evaluated (2011): +3.5% Phys.Rev. C83 (2011) 054615 & Phys.Rev. C84 (2011) 024617 • Neutron lifetime decrease → σν(Inverse • Beta Decay) increase +1% • Previously non-accounted long-lived • isotopes in reactors +1% Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  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 Losc ~ 2-10m Robs/pred=0.927±0.023 Phys.Rev. D83 (2011) 073006 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  8. 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) 073006 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  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 ~ Losc ~ 10 m) • Reactor core size important – large cores wash out oscillation Grenoble’s ILL most compact! Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  10. STEREO • 2m3Gd-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 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  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 2013-2014 Design & construction 2015 Installation at ILL 2015-2016 Physics Run • ergewqrg Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  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. Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  13. ANR Proposal • Porteur: David LHUILLIER (CEA Saclay) • 800 k€ + 2 postdocs (+1 ENIGMASS postdoc=> 1postdoc/french lab) • Timescale: 04/2013 ANR funding decision 2013-2014 Design & construction Late 2014 Lab tests 2015 Installation at ILL 2015-2016 Physics Run Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  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 m-veto - water 10 cm lead Polyethylene Tube 20 cm acrylic buffer 10 cm lead front wall Source 5 target cells 40 cm thick Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie ~ 3.30 m

  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 Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

  16. BACKUP SLIDES Conseil Labo Demande ANR STEREO Pablo DEL AMO SANCHEZ, LAPP, UniSavoie

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