The SuperNEMO experiment A very low background experiment Jérémy ARGYRIADES, LAL Orsay

2nd Nov 2007Jérémy ARGYRIADES DUSEL Town Meeting 2 Effective neutrino mass and neutrino oscillations In 3 years NEMO 3 CUORICINO ~10 kg experiments Best limits today Ge experiments Feruglio F., Strumia A., Vissani F. hep-ph/ degenerate Normal hierarchy Inverse hierarchy Klapdor’s claim 100 kg experiment SuperNEMO < 50 meV

2nd Nov 2007Jérémy ARGYRIADES DUSEL Town Meeting 3 SuperNEMO Collaboration USA MHC INL (U Texas) Japan U Saga KEK U Osaka France CEN Bordeaux IReS Strasbourg LAL ORSAY LPC Caen LSCE Gif/Yvette UK UCL U Manchester Imperial College Finland U Jyvaskula Russia JINR Dubna ITEP Mosow Kurchatov Institute Ukraine INR Kiev ISMA Kharkov Czech Republic Charles U Praha IEAP Praha Marocco Fes U Slovakia (U. Bratislava) ~ 60 physicists, 12 countries, 27 laboratories Spain U Valencia U Saragossa U Barcelona Poland U Warsaw

2nd Nov 2007Jérémy ARGYRIADES DUSEL Town Meeting 4 Planar and modular design: ~ 100 kg of enriched isotopes (20 modules  5 kg) Possible SuperNEMO design Top view 1 module: Source (40 mg/cm 2 ) 4 x 3 m 2 Tracking : drift chamber ~3000 cells in Geiger mode Calorimeter: scintillators + PM ~ PM if scint. blocs ~ 100 PM if scint. bars 4 m 3 m

2nd Nov 2007Jérémy ARGYRIADES DUSEL Town Meeting 5 Possible location for SuperNEMO Canfranc (Spain) Phase I 20 kg Modane (Frejus) (France) Phase II kg

2nd Nov 2007Jérémy ARGYRIADES DUSEL Town Meeting 6 From NEMO3 to SuperNEMO… objectives 7 kg kg Isotope mass M Efficiency   8 % ~ 30 % Choice of isotope 100 Mo 150 Nd or 82 Se NEMO-3 SuperNEMO N exclu = f(BKG) Internal contaminations 208 Tl and 214 Bi in the  foil 208 Tl <   Bq/kg 214 Bi < 300  Bq/kg 208 Tl <   Bq/kg (If 82 Se: 214 Bi < 10  Bq/kg) T 1/2 (  ) > y < 0.3 – 1.3 eV T 1/2 (  ) > y < 50 meV SENSITIVITY Energy resolution FWHM(calorimeter) 3MeV T 1/2 (  ) > ln2  M    T obs N exclu N avo A 

2nd Nov 2007Jérémy ARGYRIADES DUSEL Town Meeting 7 The BiPo decay 212 Bi from Thorium decays 1/3 into 208 Tl, 2/3 into 212 Po The BiPo detector measures the e - from 212 Bi --> 212 Po, and after ~300ns the α from 212 Po --> 208 Pb 2 plates of plastic scint. 2β source between them 20 optical guides + PMTs

2nd Nov 2007Jérémy ARGYRIADES DUSEL Town Meeting 8 software Multi Layer Perceptron 25 positions used on the whole surface x 500 ev learnings/ev. : PMTs charges -> source position. software Multi Layer Perceptron 25 positions used on the whole surface x 500 ev learnings/ev. : PMTs charges -> source position. Neural Network Software ΔxΔycm Position resolution better than 2 cm

2nd Nov 2007Jérémy ARGYRIADES DUSEL Town Meeting 9 Cost estimate (preliminary) Isotope: 10 M€ if 82Se to be estimated if 150Nd Detector: 20 M€ Grand Total : M€ R&D SuperNEMO NEMO3 Running RUNNING of Full detector construction of 20 modules SuperNEMO 1 st module construction Final SuperNEMO modules installation Preparation of the site BiPoinstallation BiPoModaneBiPoconstruction BiPo Canfranc 6 SuperNEMO modules Canfranc Schedule / cost

2nd Nov 2007Jérémy ARGYRIADES DUSEL Town Meeting 10 Conclusion SuperNEMO 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( 212 Bi  212 Po) < 20 µBq/m 2  A( 208 Tl) < 10 µBq/m 2 instead of 2 The improvement of the position resolution should increase this sensibility until 2 µBq/m 2.

2nd Nov 2007Jérémy ARGYRIADES DUSEL Town Meeting 11 Thanks, merci, gracias, Ευχαριστώ, ありがとう, Спасибо, grazie, متشكرم, благодаря, d ě kuji, obrigado, Danke