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