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DCBA experiment for searching for Neutrinoless Double Beta Decay

DCBA experiment for searching for Neutrinoless Double Beta Decay.  Results of DCBA-T2  Status of DCBA-T3  Prospects of MTD (Magnetic Tracking Detector)  Summary. Nobuhiro Ishihara (KEK, Tsukuba). TAUP2007 Sendai,September 11- 15, 2007. DCBA : D rift C hamber B eta-ray A nalyzer.

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DCBA experiment for searching for Neutrinoless Double Beta Decay

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  1. DCBA experiment for searching for Neutrinoless Double Beta Decay  Results of DCBA-T2  Status of DCBA-T3  Prospects of MTD (Magnetic Tracking Detector)  Summary Nobuhiro Ishihara (KEK, Tsukuba) TAUP2007Sendai,September 11- 15, 2007 N. Ishihara, TAUP2007, Sendai

  2. DCBA: Drift Chamber Beta-ray Analyzer DCBAcollaboration N. Ishihara, Y. Kato, T. Inagaki, G. Iwai, T. Ohama, S. Takeda, Y. Yamada, T. Haruyama, Y. Makida, M. Kawai High Energy Accelerator Research Organization (KEK), Tsukuba, Japan S. Kitamura, T. Ishikawa, T. Sakuma, T. Sumiyoshi Tokyo Metropolitan University, Tokyo, Japan Y. Teramoto, Osaka City University, Osaka, Japan I. Nakano, Okayama University, Okayama, Japan Y. Sakamoto, Tohoku Gakuin University, Sendai, Japan Y. Nagasaka, Hiroshima Institute of Technology, Hiroshima, Japan N. Tamura, Niigata University, Niigata, Japan K. Tanaka, SSI, Saitama, Japan R. Ito, ZTJ, Tokyo, Japan N. Ishihara, TAUP2007, Sendai

  3. DCBA-T2 DriftChamber Beta-rayAnalyzer X B VTX Z 1 150Nd→150Sm+2e- 2 Y Z X p (MeV/c): momentum, r (cm): radius, : pitch angle B (kG): magnetic field, me (MeV/c2): electron mass VTX VTX 2 Y 1 2 1 Y Z X N. Ishihara, TAUP2007, Sendai

  4. Pickup Anode 100 mV/div 100 ns/div Y Z X Gas:He(85%)+CO2(15%) Principle of DCBA N. Ishihara, TAUP2007, Sendai

  5. DCBA-T2 • Drift chamber Multi-track capability Anode wire pitch 6 mm Pickup wire pitch 6 mm Sensitive vol. 18(X)  26(Y)  26(Z) cm3 Signal readout Flash ADC X-position Drift velocity  Drift time (σX ~ 0.5 mm) Y-position Anode wire position (σY ~ 0.5 mm) Z-position Pickup wire position (σZ ~ 0.5 mm) • Magnet Solenoid coil + Flux return yoke Magnetic field 0.8 kG (Max.) Uniform Vol. 40 dia. x 70 cm3 (B/B0 < 1%) • Veto-counters Scintillation counters N. Ishihara, TAUP2007, Sendai

  6. 207Bi point source B y Y 207Bi point source Z x X 207Bi point source Y z X Z x Energy = 1073keV Energy measurement of an I. C. electron from 207Bi N. Ishihara, TAUP2007, Sendai

  7. Energy resolution of DCBA-T2 Including BGD Preliminary 0.48 (1.5%) 1.05 (2.4%) 0.56 (0.6%) 0.98 (7.0%) 207Bi N. Ishihara, TAUP2007, Sendai

  8. e2 214Bi (Uranium decay series) e1 Y max=1.85 MeV (e1=0.57 MeV) X 0+ 1.42 MeV 3.27 MeV Z conv. elec. (e2=1.47 MeV) X 0+ 214Po BGD event 2-electron event Z Y X N. Ishihara, TAUP2007, Sendai

  9. Other BGD events (1) α y y x x z z Alpha-ray x x pair creation N. Ishihara, TAUP2007, Sendai

  10. Other BGD events (2) y y x x z z free electron x x back scattering N. Ishihara, TAUP2007, Sendai

  11. DCBA-T3 Y X N. Ishihara, TAUP2007, Sendai

  12. Main parameters of DCBA-T3 • Drift chamber Multi-track capability Source Nd2O3 (40 mg/cm2 13,760 cm2 = 550 g) (150Nd = 0.18 mol) Sensitive vol. 4(X)  44(Y)  44(Z) cm3/chamber: 8 chamber 4(X)  20(Y)  44(Z) cm3/chamber: 4 chamber Anode wire pitch 3 mm Pickup wire pitch 3 mm Signal readout Flash ADC X-position Drift velocity  Drift time (X  0.5 mm) Y-position Anode wire position (Y  0.2 mm) Z-position Pickup wire position (Z 0.2 mm) • Magnet Superconducting Solenoid + Flux return yoke Magnetic field 2.0 kG (Max.) Uniform Vol. 80 dia. x 80 cm3 (B/B0 < 1%) • Veto-counters Scintillation counters N. Ishihara, TAUP2007, Sendai

  13. DCBA-T3 SC Magnet 80 cm 80 cm N. Ishihara, TAUP2007, Sendai

  14. DCBA-T3 Drift Chambers (Central part) 452 452 50 570 570 N. Ishihara, TAUP2007, Sendai

  15. Trigger DAQ for DCBA-T3 32ch Preamp&FADC Card Start/Stop Trigger Board Magnet CPU Board Signal detect Start Signal Detect Start Stop FADC LVDS out DC Power Pickup STOP Memory Anode / 160ch Pickup / 160ch Anode 6U CompactPCI N. Ishihara, TAUP2007, Sendai

  16. Geant4 studies of energy resolution 976 keV FWHM 80 keV Eff = 53% 1500 keV FWHM 80 keV Eff = 56% DCBA-T3 Magnetic field = 1.8 kG Wire pitch = 3 mm Max. drift length = 40 mm Gas : He (85%) + CO2 (15%) Expected energy resolution N. Ishihara, TAUP2007, Sendai

  17. Magnetic Tracking Detector(MTD: temporary name) 3500 Source plate: 80 m2/module Thickness: 15 (40) mg/cm2 Source weight: 12 (32) kg/module N. Ishihara, TAUP2007, Sendai

  18. Half-life and Effective Mass Sensitivities of DCBA for 150Nd, 100Mo and 82Se(Tentative) Natural Nd 150Nd 100Mo 82Se (5.6%150Nd) (80% enr.) (90% enr.) (90% enr.) DCBA Amount (mol) 190 2700 5400 6600 (600 kg: 50 modules) T1/20 sns (yr) 9  1024 1  1026 2  1026 3  1026 <m>sns (eV) 0.06 0.02 0.07 0.04 Nucl. Matrix Element: A. Staudt et al. Europhys. Lett. 13 (1) (1990) 31 N. Ishihara, TAUP2007, Sendai

  19. Summary  DCBA (Drift Chamber Beta-ray Analyzer) is an R&D project for constructing Future MTD (Magnetic Tracking Detector).  DCBA-T2 have shown that the energy resolution is about 150 keV (FWHM) at 980 keV, and background events are clearly identified.  DCBA-T3 is scheduled to be constructed in 2007 and operated in 2008. Target energy resolution is about 80 keV (FWHM) at 980 keV. • New international collaboration using MTD will be able to investigate the effective neutrino mass down to around 30 meV. N. Ishihara, TAUP2007, Sendai

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