Demande anr stereo
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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

Demande ANR STEREO

Pablo DEL AMO SANCHEZ

Henri PESSARD

18/12/2012


Demande anr stereo

Overview

  • Neutrino anomalies

  • The STEREO experiment

  • ANR request

  • LAPP’s contribution

  • Conclusions

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


Demande anr stereo

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


Demande anr stereo

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


Reactor anomaly

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


Demande anr stereo

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


Demande anr stereo

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


Demande anr stereo

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


Demande anr stereo

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


Demande anr stereo

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


Demande anr stereo

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


Stereo collaboration

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


Anr proposal

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


Lapp s contribution

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


Demande anr stereo

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


Demande anr stereo

BACKUP

SLIDES

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


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