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The SuperNEMO experiment A very low background experiment

The SuperNEMO experiment A very low background experiment. Jérémy ARGYRIADES, LAL Orsay. Effective neutrino mass and neutrino oscillations. ~10 kg experiments. Klapdor’s claim. degenerate. Best limits today Ge experiments. 100 kg experiment SuperNEMO <m n > < 50 meV. Inverse hierarchy.

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The SuperNEMO experiment A very low background experiment

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  1. The SuperNEMO experimentA very low background experiment Jérémy ARGYRIADES, LAL Orsay

  2. Effective neutrino mass and neutrino oscillations ~10 kg experiments Klapdor’s claim degenerate Best limits today Ge experiments 100 kg experiment SuperNEMO <mn> < 50 meV Inverse hierarchy In 3 years NEMO 3 CUORICINO Normal hierarchy Feruglio F. , Strumia A. , Vissani F. hep-ph/0201291 Jérémy ARGYRIADES DUSEL Town Meeting

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

  4. Possible SuperNEMO design 1 m 5 m Planar and modular design: ~ 100 kg of enriched isotopes (20 modules  5 kg) 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 Top view Jérémy ARGYRIADES DUSEL Town Meeting

  5. Modane(Frejus) (France) Phase II 100- 200 kg Phase I 20 kg Canfranc (Spain) Possible location for SuperNEMO Jérémy ARGYRIADES DUSEL Town Meeting

  6. From NEMO3 to SuperNEMO… objectives Me Tobs Navo T1/2(bb0n) > ln2   A Nexclu SuperNEMO NEMO-3 150Nd or 82Se 100Mo Choice of isotope Isotope mass M 100 - 200 kg 7 kg Efficiency e(bb0n) ~ 30 % 8 % Nexclu = f(BKG) 208Tl < 2mBq/kg (If82Se: 214Bi < 10 mBq/kg) 208Tl < 20mBq/kg 214Bi < 300 mBq/kg Internal contaminations 208Tl and 214Bi in the bb foil Energy resolution FWHM(calorimeter) 8% @ 3MeV 4% @ 3MeV T1/2(bb0n) >2. 1024 y <mn> <0.3 – 1.3eV T1/2(bb0n) >1026 y <mn> <50 meV SENSITIVITY Jérémy ARGYRIADES DUSEL Town Meeting

  7. The BiPo decay 212Bi 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 Jérémy ARGYRIADES DUSEL Town Meeting

  8. Δx cm Δy cm Neural Network Software • software Multi Layer Perceptron • 25 positions used on the whole surface x 500 ev. • 2000 learnings/ev. : PMTs charges -> source position. Position resolution better than 2 cm Jérémy ARGYRIADES DUSEL Town Meeting

  9. 2010 2011 2007 2008 2009 2012 2013 BiPo construction Schedule / cost NEMO3 Running R&D SuperNEMO BiPo Modane BiPo installation BiPo running @ Canfranc SuperNEMO 1st module construction Preparation of the site • Cost estimate (preliminary) • Isotope: • 10 M€ if 82Se • to be estimated if 150Nd • Detector: • 20M€ • Grand Total : 40 - 50 M€ construction of 20 modules 6 SuperNEMO modules running @ Canfranc Final SuperNEMO modules installation Jérémy ARGYRIADES DUSEL Town Meeting RUNNING of Full detector

  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(212Bi  212Po) <20 µBq/m2 A(208Tl) < 10µBq/m2 instead of 2 The improvement of the position resolution should increase this sensibility until 2 µBq/m2. Jérémy ARGYRIADES DUSEL Town Meeting

  11. Thanks, merci, gracias, Ευχαριστώ, ありがとう, Спасибо, grazie, متشكرم, благодаря, děkuji, obrigado, Danke Jérémy ARGYRIADES DUSEL Town Meeting

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