The SuperNEMO experiment A very low background experiment Jérémy ARGYRIADES, LAL Orsay
Jan 15, 2016
The SuperNEMO experimentA very low background experiment
The SuperNEMO experimentA very low background experiment
Jérémy ARGYRIADES, LAL OrsayJérémy ARGYRIADES, LAL Orsay
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Effective neutrino mass and neutrino oscillations
In 3 yearsNEMO 3CUORICINO
~10 kg experiments
Best limits todayGe experiments
Feruglio F. , Strumia A. , Vissani F. hep-ph/0201291
degen
erat
e
Normal hierarchy
Inverse hierarchy
Klapdor’s claim
100 kg experimentSuperNEMO
<m> < 50 meV
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SuperNEMO CollaborationSuperNEMO Collaboration
USAMHCINL
(U Texas)
JapanU Saga
KEKU Osaka
FranceCEN Bordeaux
IReS StrasbourgLAL ORSAY
LPC CaenLSCE Gif/Yvette
UKUCL
U ManchesterImperial College
FinlandU Jyvaskula
RussiaJINR DubnaITEP Mosow
Kurchatov Institute
UkraineINR Kiev
ISMA Kharkov
Czech RepublicCharles U PrahaIEAP Praha
MaroccoFes U
Slovakia(U. Bratislava)
~ 60 physicists, 12 countries, 27 laboratories
SpainU Valencia
U SaragossaU Barcelona
PolandU Warsaw
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Planar and modular design: ~ 100 kg of enriched isotopes (20 modules 5 kg)
Possible Possible SuperNEMSuperNEMO designO design
Top view5 m
1 m
1 module: Source (40 mg/cm2) 4 x 3 m2
Tracking : drift chamber ~3000 cells in Geiger mode Calorimeter: scintillators + PM
~ 1 000 PM if scint. blocs ~ 100 PM if scint. bars
4 m
3 m
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Possible location for SuperNEMO
Canfranc (Spain)
Phase I20 kg
Modane(Frejus)
(France)
Phase II100- 200 kg
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From NEMO3 to SuperNEMO… objectivesFrom NEMO3 to SuperNEMO… objectives
7 kg 100 - 200 kg Isotope mass M
Efficiency 8 % ~ 30 %
Choice of isotope 100Mo
150Nd or 82Se
NEMO-3 SuperNEMO
Nexclu = f(BKG)Internal contaminations
208Tl and 214Bi in the foil
208Tl < Bq/kg214Bi < 300 Bq/kg
208Tl < Bq/kg
(If 82Se: 214Bi < 10 Bq/kg)
T1/2() > 2. 1024 y<m> < 0.3 – 1.3 eV
T1/2() > 1026 y<m> < 50 meV
SENSITIVITY
Energy resolution FWHM(calorimeter)8% @ 3MeV 4% @ 3MeV
T1/2() > ln2 M Tobs
Nexclu
Navo
A
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The BiPo decayThe BiPo decay212Bi from Thorium decays 1/3 into 208Tl, 2/3 into 212Po
The BiPo detector measures the e- from 212Bi --> 212Po, and after ~300ns the α from 212Po --> 208Pb
2 plates of plastic scint.
2β source between them
20 optical guides + PMTs
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• software Multi Layer Perceptron• 25 positions used on the whole surface x 500 ev.• 2000 learnings/ev. : PMTs charges -> source
position.
• software Multi Layer Perceptron• 25 positions used on the whole surface x 500 ev.• 2000 learnings/ev. : PMTs charges -> source
position.
Neural Network SoftwareNeural Network Software
Δx Δycm cm
Position resolution better than 2 cm
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Cost estimate (preliminary)Isotope: 10 M€ if 82Seto be estimated if 150Nd Detector: 20 M€
Grand Total : 40 - 50 M€
R&D SuperNEMOR&D SuperNEMO
2007 2008 2009 2010 2011 2012 2013
NEMO3 Running NEMO3 Running
RUNNING ofRUNNING ofFull Full
detectordetector
construction of construction of 20 modules 20 modules
SuperNEMO 1SuperNEMO 1stst module module
constructionconstruction
Final SuperNEMO modules Final SuperNEMO modules installation installation
PreparationPreparationof the siteof the site
BiPoBiPoinstallatioinstallatio
nn
BiPoBiPoModaneModane
BiPoBiPoconstructionconstruction
BiPo BiPo running @ Canfrancrunning @ Canfranc
6 SuperNEMO modules running @ 6 SuperNEMO modules running @ CanfrancCanfranc
Schedule / costSchedule / cost
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ConclusionConclusionSuperNEMO has to pass through 3 major difficulties : Source purification : both Se and Nd purification techniques have been developed for big quantities, but the result has to be tested in the BiPo detector Energy resolution : liquid scintillator is achieving a energy resolution of 7.3% at 1 MeV whereas 7% is aimed Radioactivity measurement : the BiPo detector is already close to the requirement :
A(212Bi 212Po) < 20 µBq/m2
A(208Tl) < 10 µBq/m2 instead of 2The improvement of the position resolution should increase this sensibility until 2 µBq/m2.
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Thanks, merci, gracias, Ευχαριστώ, ありがとう , Спасибо, grazie, متشكرم ,
благодаряd ,ě ,kujiobrigado, Danke
Thanks, merci, gracias, Ευχαριστώ, ありがとう , Спасибо, grazie, متشكرم,
благодаря, děkuji, obrigado, Danke