1 / 31

Search for bb0n decay with NEMO 3 and SuperNEMO experiments

Search for bb0n decay with NEMO 3 and SuperNEMO experiments. Vladimir Vasiliev UCL, London, UK on behalf of the NEMO collaboration. SUSY 2007 Karlsruhe, 28 July 2007. Outline. bb decay and SUSY NEMO-3 experiment Overview of the NEMO-3 Highlights of the main NEMO-3 results

kiley
Download Presentation

Search for bb0n decay with NEMO 3 and SuperNEMO experiments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Search for bb0n decay with NEMO 3 and SuperNEMO experiments Vladimir Vasiliev UCL, London, UK on behalf of the NEMO collaboration SUSY 2007 Karlsruhe, 28 July 2007

  2. Outline • bb decay and SUSY • NEMO-3 experiment • Overview of the NEMO-3 • Highlights of the main NEMO-3 results • SuperNEMO project • R&D program • Current status 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 2

  3. bb0n decay, n mass mechanism only possible for Majorana neutrinos with mass > 0 Beyond the SM: Lepton Number Violation ! 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 3

  4. bb decay and SUSY: threelinear terms lepton number violation bb decay amplitude related to (l'111)2 dR+dR → uL+uL+eL+eL exchange with: squarks sleptons neutralinos gluinos 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO status 4

  5. bb decay and SUSY: squark mixing contribution from l'1jk possible via left- and right- squark mixing Hirsch,Klapdor-Kleingrothaus, Kovalenko, PLB 372 (1996) 181 Paes, Hirsch,Klapdor-Kleingrothaus, PLB 459(1999) 450 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 5

  6. bb decay and SUSY: radiative neutrino mass neutrino can acquire mass due to SUSY radiactive corrections,l'1kk Gozdz, Kaminski, Šimkovic, PRD 70 (2004) 095005 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 6

  7. NEMO 3: Neutrino Ettore Majorana Observatory • Czech Republic • Finland • France • Japan • Russia • Spain • UK • Ukraine • USA LS Modane, FR Tunnel Frejus 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 7

  8. 20 sectors B(25 G) 3 m 4 m key techniques: tracking, calorimetry, timing NEMO-3 • Goal: reconstruct 2 electrons of the final state • E1 + E2 = Qbb • Particle physics - like approach: • Measure several observables of the final state • Trajectories of 2 electrons • Energies of 2 electrons • Time • Magnetic field curvature ("+" vs "-") • Reconstruct the final state topology and kinematics • Several requirements for candidate events • Topology (vertex, track-scintillator correlation) • Time coincidence • 2-electron invariant mass • Identify e-, e+, g, a • Able to measure backgrounds 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 8

  9. bb2n measurement bb0n search Multi source detector 116Cd405 g Qbb = 2805 keV 96Zr 9.4 g Qbb = 3350 keV 150Nd 37.0 g Qbb = 3367 keV 48Ca 7.0 g Qbb = 4272 keV 130Te454 g Qbb = 2529 keV Detector bkg measurement natTe893 g 100Mo6.914 kg Qbb = 3034 keV 82Se0.932 kg Qbb = 2995 keV Cu621 g 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 9

  10. Sector interior view cathode rings wire chamber PMTs Calibration tube scintillators bb isotope foils 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 10

  11. Installation in Modane 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 11

  12. Installation in Modane 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 12

  13. With shielding water tank wood coil iron shield 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 13

  14. Full detector now 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 14

  15. Transverse view Run Number: 2040 Event Number: 9732 Date: 2003-03-20 Longitudinal view Vertex emission Vertex emission Deposited energy: E1+E2= 2088 keV Internal hypothesis: (Dt)mes –(Dt)theo = 0.22 ns Common vertex: (Dvertex) = 2.1 mm (Dvertex)// = 5.7 mm Typical bb2n event observed from 100Mo 100Mo6.914 kg Qbb = 3034 keV Criteria to select bb events: • 2 tracks with charge < 0 • 2 PMT, each > 200 keV • PMT-Track association • Common vertex • Internal hypothesis TOF (external event rejection) • No other isolated PMT (g rejection) • No delayed a track (214Bi rejection) 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 15

  16. External double Compton Compton + Moller pair production Internal b- +Compton b- +Moller b- +IC NEMO backgrounds • Natural radioactivity: • U/Th chain • 40K • Radon • cosmic m • neutrons 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 16

  17. Backgrounds: bb-like events from Cu - background sources simulated using Monte Carlo - radioactivity rates from material tests in HPGe and control channel meas's Phase II data; 1.5 y x 0.6 kg ~ 1 kg y. MC prediction: 130 ev. 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 17

  18. Angular distribution Sum energy spectrum 12000 10000 8000 6000 4000 2000 0 219 000 events 6914 g 389 days S/B = 40 219 000 events 6914 g 389 days S/B = 40 12000 10000 8000 6000 4000 2000 0 Number of events • Data 22 Monte Carlo • Data 22 Monte Carlo Background subtracted Background subtracted Cos() T1/2() = 7.11  0.02 (stat)  0.54 (syst)  1018 years « factory»→ tool for precision test NEMO 3 highlights: 2b2n100Mo NEMO-3 NEMO-3 100Mo 100Mo Number of events/0.05 MeV E1 + E2 (MeV) Phys. Rev. Lett. 95 182302 (2005) 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 18

  19. 48Ca NEMO 3 highlights: 2b2n preliminary Preliminary results for ~360 d Phase I data. Additional statistics is being analysed and to be published soon. 82Se T1/2 = 9.6 ± 0.3 (stat) ± 1.0 (syst)  1019 y 116Cd T1/2 = 2.8 ± 0.1 (stat) ± 0.3 (syst)  1019 y 150Nd T1/2 = 9.7 ± 0.7 (stat) ± 1.0 (syst)  1018 y 96Zr T1/2 = 2.0 ± 0.3 (stat) ± 0.2 (syst)  1019 y 48Ca T1/2 = 3.9 ± 0.7 (stat) ± 0.6 (syst)  1019 y 932 g 389 days 2750 events S/B = 4 82Se Important ingridient for M0n calculation in QRPA 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 19

  20. NEW in 2007: direct meas. of 130Te 2b2n • The  half-life of 130Te has been a long-standing mystery:: • Geochemical: • (25 ± 2) x 1020 years (Kirsten 83) • (27 ± 2) x 1020 years (Bernatowicz 93) • (7.9 ± 1) x 1020 years (Takaoka 96) • ~8 x 1020 years (Manuel 91) • Difference between ‘old’ and ‘young’ ores due to • time dependence of constants..? • Ratio of 82Se/130Te (less systematic): • (9 ± 1) x 1020 years (average by A. Barabash) • Direct measurement: • (6.1 ± 1.4 (syst) ± 2.93.4(stat)) x 1020 years (Arnaboldi 2003) 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 20

  21. NEW in 2007: direct meas. of 130Te 2b2n 109 events 607 events background subtracted 534 days, 454 g of 130Te 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 21

  22. NEMO 3 highlights: 2b0n100Mo & 82Se 100Mo, Phase I + II, 693 days 82Se ,Phase I + II, 693 days T1/2 > 2.1 x 1023 (90 % CL) <mn>* < 1.4-2.2 eV l'111 < 2.5 10-4 T1/2 > 5.8 x 1023 (90 % CL) <mn>* < 0.8 – 1.3 eV l'111 < 1.5 10-4 T1/2 > 8 x 1023 (90 % CL) <mn>* < 0.7-1.1 eV expected in 2009: T1/2 > 2 x 1024 (90 % CL) <mn>* < 0.4 – 0.7 eV • Collaboration decided to perform blind analysis with mock data • Plan to open the box and update the results ~ summer 2008 and again ~ early 2010. * Recent QRPA NME calculation as in MEDEX'07 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 22

  23. 'Majoron' search Lepton number violation due to local symmetry breaking Axions  (‘Majorons’) with coupling to neutrinos best limits n: spectral index, limits on half-life in years ** PI data, R.Arnold et al. Nucl. Phys. A765 (2006) 483 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 23

  24. SuperNEMO project 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 24

  25. SuperNEMO NEMO-3 150Nd or 82Se isotope 100Mo isotope massM 100-200 kg 7 kg 208Tl < Bq/kg if 82Se: 214Bi < 10 Bq/kg 208Tl: < 20 Bq/kg 214Bi: < 300 Bq/kg internal contaminations 208Tl and 214Bi in the foil energy resolution (FWHM) 8% @ 3MeV 4%@ 3 MeV T1/2() > 2 x 1024 y <mn> < 0.4 – 0.7 eV T1/2() > 2 x 1026 y <mn> < 40 – 70 meV From NEMO-3 to SuperNEMO M Tobs NA T1/2 () > ln 2   A N90% CL efficiency  ~ 30 % 8 % 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 25

  26. 1 module: Source (~40 mg/cm2) 4 (length) x 3(height) m2 Tracking : drift chamber ~3000 cells in Geiger mode Calorimeter: scintillators + PM ~1 000 PM if scint. blocks ~ 100 PM if scint. bars Very preliminary SuperNEMO design Planar and modular design: ~ 100 kg of isotope (~20 modules  5-7 kg) 4 m Top view 1 m 5 m 5 m 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 26

  27. R&D: SuperNEMO calorimeter • Goal: FWHM  7%/E  4% at 3 MeV (Currently 14-16%/E in NEMO3) • A combination of energy losses in the foil and calorimeter DE/E • Studies • Organic (plastic or liquid), • Shape, size, coating • PMTs (Photonis, Hamamatsu, ETL) • Light guides, optical contact • Chemistry High QE Hamamatsu tube = DE/E = 6.5% at 1 MeV  3.8% at 3 MeV if 1/E + BC404 scintillator wraped in teflon 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 27

  28. Qbb (MeV) Isotopic Abundance R&D: isotope enrichment/ purification Choice of nucleus depends on: • enrichment possibilities • high Q value  larger phase space  lower non- background • small 2 contribution • 4 kg of 82Se funded by ILIAS • have been delivered from Russia. • purification at ILN (US) underway • enrichment of Nd possible in France (MENPHIS, currently mothballed) Two main options: G0(150Nd) / G0(82Se) = 8 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 28

  29. 2010 2011 2007 2008 2009 2012 2013 NEMO3 Running TDR R&D SuperNEMO BiPo construction SuperNEMO 1st module construction construction of 20 modules RUNNING of Full detector SuperNEMO schedule summary BiPo1 Canfranc BiPo installation BiPo running @ Canfranc Preparation of the site 6 SuperNEMO modules running @ Canfranc Final SuperNEMO modules installation 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 29

  30. Conclusion NEMO’s Tracking+Calorimetry approach is unique: -high background rejection - choice of isotopes - reconstruction of kinematics NEMO 3 is taking data: - factory, important for understanding of backgrounds and NME -limits on  using different isotopes: -T1/2 (> 5.8 x 1023 y @ 90% CL for 100Mo  <m> < 0.8-1.3 eV (693 days); l'111 < 1.5 x 10-4 -limits on Majoron's coupling -T 1/2() = (7.6 ± 1.5 (stat) ± 0.8(syst)) x 1020 y for 130Te SuperNEMO R&D approved in France, the UK and Spain; TDR expected in 2008; full 20 modules in 2012-2013 -choice of isotopes: 82Se or 150Nd 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 30

  31. Backup slides 28 July 2007, SUSY07, Karlsruhe Vladimir Vasiliev NEMO 3/ SuperNEMO experiments 31

More Related