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V. Egorov

V. Egorov. JINR + LSM. =. V. Egorov. The love story. 1991 Orsay S.Jullian and D.Lalanne proposed to bring our 2 β -spectrometer to Modane 1993 TGV . TGV-1 (1994 – 2000).

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V. Egorov

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  1. V. Egorov

  2. JINR+LSM = V. Egorov

  3. The love story • 1991 Orsay S.Jullian and D.Lalanne proposed to bring our 2β-spectrometer to Modane • 1993 TGV

  4. TGV-1 (1994 – 2000) • Stack of 16 HPGe planar detectors58mm (sensitive area = 12 cm2) Total area of samples  100 cm2 • 7 samples of natCa • 8 samples of enriched 48Ca: 1.08 g  1.35•1022 atoms CaCO3 ( 41 mg/cm2 ) • NIM A372 (1996) 222 $ 250 000

  5. TGV-1 results T1/2 (22) = =(2.97.5)•1019 y T1/2 (20)   1.5•1021 y (90%CL) Zero

  6. The love story • 1994 We had produced one (of two) scintillator wall for the NEMO-2 Started to prepare NEMO-3

  7. Participation of JINR in NEMO-3 • 6 tons of plastic scintillator (both internal and external walls) • Big-dimensional Cu and Fe details of the sectors • Fe shielding • Enriched isotopes: 48Ca 96Zr 150Nd • Mounting, cabling, tuning, … • Software for the data analysis • Calibration, analysis

  8. The love story • 2000 Dramatic upgrade of TGV (TGV-2)

  9. TGV-2(2000 – …)

  10. TGV-2 (2000 – …) • Stack of 32 HPGe planar detectors60 mm (sensitive area : 20 cm2) Total area of samples : 330 cm2 Total mass of sample(s) : 10  20 g Total efficiency : 40  50 % E-resolution : 3  4 keV @ 60Co LE-threshold : 40  50 keV (5  6 keV) • 16 samples of 48Ca (10 g) : 20 g CaF2 + CH2 ( 60 mg / cm2 ) • 16 samples of 106Cd: 10 g Cd( 30 mg / cm2 )

  11. Nuclei - candidates T1/2(5-forbidden ) 0.187% 1.25% 2 X-rays Purification procedure (ion-exchange technique). 20 g of 48Ca have been purified: k (Co, Ra, Eu) = (1.310)•103

  12. The love story • 2005 E.Yakushev → EDELWEISS

  13. Participation of JINR in EDELWIESS-2 • Background environment control - Rn detector - Low-background n-detectors (internal background ≈ 0.4 counts per day) • Assembling, commissioning, running(calibrations, tests, etc) • Direct beta calibrations(MC and interpretation)

  14. The love story • 2005 Super-Heavy In Nature (SHIN) looking for multi-neutron events • 2010 eka-Os → eka-Xe

  15. The love story (be continued) • NEMO → SuperNEMO (+BiPo) calorimeter calibration system software

  16. The love story (be continued) • TGV 2010: finish 2EC of 106Cd Search for Solar Axion with 57Fe • Low-threshold Ge detectors (coherent -e scattering, NMM, etc.) 2.9 – 3.0 keV threshold is not enough low… 250 g ~400 eV (→250 eV) 450 g stack Σ10 kg (TGV cryostat is perfectly suited for the low-background tests)

  17. Relic neutrino?...

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