1. P. CermakRez near Prague, December 2005 EC/EC process measurement in TGV experiment For TGV collaboration: JINR Dubna, Russia CTU Prague, Czech Republic CSNSM Orsay, France RRC - Kurchatov Institute Moscow, Russia CU Bratislava, Slovakia P. Čermák IEAP CTU in Prague

2. P. CermakRez near Prague, December 2005 Outline ● TGV I TGV II ● TGV II measurements overview ● Data processing ● Example ● Summary

3. P. CermakRez near Prague, December 2005 TGV Telescope Germanium Vertical (stack of 16 (32) HPGe detectors) aims at the study of double beta processes of 48 Ca and 106 Cd (double beta decay, double electron capture) started in 1996 located in Modane Underground Laboratory (France)

4. P. CermakRez near Prague, December 2005 TGV I ● 16 HPGe detectors of planar type, diameter 40mm, thickness 6mm ● 8x 48 Ca foils ● 8x Ca-natural foils ~ 1.35 x 10 22 of 48 Ca atoms (1.08 g)

5. P. CermakRez near Prague, December 2005 TGV I open cryostatassembled cryostat, PAs

6. P. CermakRez near Prague, December 2005 TGV II to improve 48 Ca result obtained by TGV I to investigate  processes in 106 Cd (to focus on EC/EC channel) purpose: 2 EC/EC:

7. P. CermakRez near Prague, December 2005 TGV II spectrometer Dewar cryostat Pb Cu borated polyethylene PA SM 1m

8. P. CermakRez near Prague, December 2005 Detector part of the TGV II 32 HPGe planar detectors  60 mm x 6 mm with sensitive volume: 20.4 cm 2 x 6 mm Total sensitive volume: 400 cm 3 Total mass of detectors: 3 kg Total area of samples : 330 cm 2 Total mass of sample(s) : 10  25 g E-resolution : 3  4 keV @ 60 Co LE-threshold : down to 10 keV Double beta emitters: - samples of 48 Ca: CaF 2 + CH 2 ( 75 mg / cm 2 ) - samples of 106 Cd: 106 Cd (~ 50 µm ) U+Th<0.1 ppb

9. P. CermakRez near Prague, December 2005 TGV II pedestalopen cryostat

10. P. CermakRez near Prague, December 2005 TGV II assembled cryostat, PAs

11. P. CermakRez near Prague, December 2005 Run overview 12/03 – 2/04…background, empty cryostat, 1363 hours 3/04 – 5/04…13x 106 Cd + 3x Cd-nat., 1768 hours 113m Cd, 14 years, Q  =590 keV

12. P. CermakRez near Prague, December 2005 ● 5/04 – 6/04… 12x 106 Cd + 4x Cd-nat., 328 hours ● 6/04 – 10/04…12x 106 Cd + 4x Cd-nat., 2033 hours ● 11/04 – 1/05…16x Cd-nat., 903 hours ● 2/05 – …… 12x 106 Cd + 4x Cd-nat., new sources: 106 Cd... 75.00% 112 Cd... 6.18% 108 Cd... 0.80% 113 Cd... 2.77% 110 Cd... 4.47% 114 Cd... 6.18% 111 Cd... 3.55% 116 Cd... 1.05% Run overview (2)

13. P. CermakRez near Prague, December 2005 Data processing 1.What we look for: X-rays @21keV from 106 Pd

14. P. CermakRez near Prague, December 2005 Data processing (2) 2.What we have: X-rays @23keV from 106 Cd 106 Cd, 3736 hours

15. P. CermakRez near Prague, December 2005 3. Zoom to 20keV region (after background reduction) 3736 hours, 106 Cd Energy windows:(16-19) keV (19-22) keV (28-31) keV 5533 hours, 106 Cd

16. P. CermakRez near Prague, December 2005 Summary Full configuration operation (32 channels) Background, calibration, admixtures in sources Basic background measurements done (empty cryostat, natural Cd) From February 2005 long-term measurement with 106 Cd Negotiation on 106 Cd lease extension First direct measurement of EC/EC process in 106 Cd (~ 6 x 10 19 years)