T elescope G ermanium V ertical

1. V. Egorov T G V Telescope Germanium Vertical status report JINR Dubna, Russia CSNSM Orsay, France CTU Prague, Czech Republic RRC - Kurchatov Institute Moscow, Russia CU Bratislava, Slovakia

2. Double Beta Spectrometers TGV

3. Nuclei - candidates 0.187% 1.25% 2 X-rays $ 0.25 ×106/g

4. TGV-1 (1994 – 2000) results T1/2 (22) = =(2.97.5)•1019 y T1/2 (20)   1.5•1021 y (90%CL) Zero

5. Telescope Germanium Vertical (TGV-2) 32HPGeplanardetectors 60 mm × 6 mm with sensitive volume:20.4 cm2× 6 mm Total sensitive volume:~400 cm3 Total mass of detectors: ~3 kg Total area of samples :330 cm2 Total mass of samples :10  25 g Total efficiency :50  60 % E-resolution :3  4 keV@60Co LE-threshold :5  6keV Double EC (2005-2006): - 12 samples of 106Cd: 10 g 106Cd(~ 50 µm ) U+Th<0.1 ppb

7. TGV-2(2000 – …)

8. Suppression of low energy noise with primitive Fourier analysis High freq. noise: E1 > E2 Real signal: E1 = E2 Low freq. noise: E1 < E2

9. Low frequency (microphonic)

10. GEMMA BTW: ν search for the Neutrino Magnetic Moment

12. µ [ 10–10 µB ] Low Energy Threshold [keV] ~ measurement quality

14. Results of one-year (2005) measurement 2νEC/EC (0+→0+,g.s.) decay of Cd-106 Experiment T1/2 ≥ 1.8 x 1020 y (95%CL) (TGV-2) T1/2 ≥ 5.8 x 1017 y (90%CL) (F.Danevich et.al.) T1/2 ≥ 1.5 x 1017 y (68%CL) (H.Kiel et.al.) Theory T1/2 = 1.0 x 1020 y (J.Suhonen) T1/2 = 8.7 x 1020 y (M.Hirsch) T1/2 = 4.4 x 1021 y (F.Simkovich)

15. -line 238 keV -line 352 keV Counts / day /detector Counts / day /detector

16. Gas-tight cup of the cryostat (ultra-pure Al, made by CANBERRA) has a weld seam here

17. Drastic solution

18. }1:10

19. Comparision of results 2νEC/EC (0+→0+,g.s.) decay of Cd-106 Experiment T1/2 ≥ 1.8 x 1020 y (95%CL) (TGV-2) T1/2 ≥ 5.8 x 1017 y (90%CL) (F.Danevich et.al.) T1/2 ≥ 1.5 x 1017 y (68%CL) (H.Kiel et.al.) Theory T1/2 = 1.0 x 1020 y (J.Suhonen) T1/2 = 8.7 x 1020 y (M.Hirsch) T1/2 = 4.4 x 1021 y (F.Simkovich)

20. CR42 Muon Capture Rates for Double Beta Decay ( PSI experiment R02-02 )

21. CR42 (d,2He) [PR C70(2004)] OMC ? 

22. CR42 Ordinary Muon Capture (OMC) • Electron Capture: e- + (A,Z)  (A, Z-1) + e Q~ me  0.5 MeV • Muon Capture: - + (A,Z)  (A, Z-1) +  Q~ m  100 MeV

23. CR42 OMC

24. CR42 Set-up

25. Observables measured: • -radiation energy (30 .. 8000 keV) • Time between the µ-Stop and the -emission (0 .. 1000 ns)

26. Time after the Muon Stop [ns] Energy of gamma-rays [keV]

27. Data Analysis: • Time evolution of the -lines intensity • Muon Life Time in the given isotope • µ-Capture Rate in the given isotope

28. CR42 Total -Capture Rates 48Ca 599±2 ns 40Ca 362±2 ns 48Ti 360±1 ns

29. Data Analysis: • Intensity of the -lines in the intermediate nucleus • Detailed balance of the -intensities • Partial µ-capture rates to the (1+), (2–) and other (low) excited states of the intermediate nucleus

30. CR42 OMC

31. Data Analysis: • Intensity of the -lines of the other daughter nuclei • Yield of the different daughter nuclei • Branching of the reactions: (µ,) (µ, n) (µ, 2n) (µ, p) … • Population of high-excited states in the intermediate nucleus

32. -lines observed with 76Se target

33. (Could be important for GERDA) BTW:µ– stopped in Argon Λcapture=(1.165±0.013) 1/µs

34. Status of the µCR42βexperiment