ec/ec process measurement in tgv experiment
DESCRIPTION
For TGV collaboration: JINR Dubna, Russia CTU Prague, Czech Republic CSNSM Orsay, France RRC - Kurchatov Institute Moscow, Russia CU Bratislava, Slovakia. EC/EC process measurement in TGV experiment. P. Č erm á k IEAP CTU in Prague. Outline. TGV I TGV II - PowerPoint PPT PresentationTRANSCRIPT
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P. Cermak Rez near Prague, December 2005
EC/EC process measurement in TGV
experiment
For TGV collaboration:
JINR Dubna, RussiaCTU Prague, Czech Republic
CSNSM Orsay, FranceRRC - Kurchatov Institute Moscow, Russia
CU Bratislava, Slovakia
P. ČermákIEAP CTU in Prague
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P. Cermak Rez near Prague, December 2005
Outline
● TGV I TGV II● TGV II measurements overview● Data processing ● Example● Summary
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P. Cermak Rez near Prague, December 2005
TGV
• Telescope Germanium Vertical (stack of 16 (32) HPGe detectors)
• aims at the study of double beta processes of 48Ca and 106Cd (double beta decay, double electron capture)
• started in 1996
• located in Modane Underground Laboratory (France)
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P. Cermak Rez near Prague, December 2005
TGV I
yT 193.33.1
22/1 10)2.4(
● 16 HPGe detectors of planar type, diameter 40mm, thickness 6mm
● 8x 48Ca foils
● 8x Ca-natural foils
~ 1.35 x 1022 of 48Ca atoms (1.08 g)
)%90(105.1 2102/1 CLyT
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P. Cermak Rez near Prague, December 2005
TGV I
open cryostat assembled cryostat, PAs
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P. Cermak Rez near Prague, December 2005
TGV II
• to improve 48Ca result obtained
by TGV I
• to investigate processes in 106Cd
(to focus on EC/EC
channel)
),(22 10646
10648 raysXPdCde e
purpose:
2EC/EC:
keVEkeVkeV XECEC 2519:ROI,2778Q /
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P. Cermak Rez near Prague, December 2005
TGV II spectrometer
Dewar
cryostatPbCu
borated polyethylene
PA
SM
1m
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P. Cermak Rez near Prague, December 2005
Detector part of the TGV II
32 HPGe planar detectors 60 mm x 6 mm with sensitive volume: 20.4 cm2 x 6 mm Total sensitive volume: 400 cm3
Total mass of detectors: 3 kg Total area of samples : 330 cm2
Total mass of sample(s) : 10 25 g E-resolution : 3 4 keV @ 60Co LE-threshold : down to 10 keV Double beta emitters: - samples of 48Ca:
CaF2 + CH2 ( 75 mg / cm2 ) - samples of 106Cd:
106Cd (~ 50 µm )
U+Th<0.1 ppb
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P. Cermak Rez near Prague, December 2005
TGV II
pedestal open cryostat
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P. Cermak Rez near Prague, December 2005
TGV II
assembled cryostat, PAs
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P. Cermak Rez near Prague, December 2005
Run overview
• 12/03 – 2/04… background, empty cryostat, 1363 hours• 3/04 – 5/04… 13x 106Cd + 3x Cd-nat., 1768 hours
113mCd,
14 years,
Q=590 keV
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P. Cermak Rez near Prague, December 2005
● 5/04 – 6/04… 12x 106Cd + 4x Cd-nat., 328 hours● 6/04 – 10/04… 12x 106Cd + 4x Cd-nat., 2033 hours● 11/04 – 1/05… 16x Cd-nat., 903 hours● 2/05 – …… 12x 106Cd + 4x Cd-nat., new sources:
106Cd ... 75.00% 112Cd ... 6.18%108Cd ... 0.80% 113Cd ... 2.77%110Cd ... 4.47% 114Cd ... 6.18%111Cd ... 3.55% 116Cd ... 1.05%
Run overview (2)
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P. Cermak Rez near Prague, December 2005
Data processing
1. What we look for: X-rays @21keV from 106Pd
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P. Cermak Rez near Prague, December 2005
Data processing (2)2. What we have: X-rays @23keV from 106Cd
106Cd, 3736 hours
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P. Cermak Rez near Prague, December 2005
3. Zoom to 20keV region (after background reduction)
3736 hours, 106Cd
Energy windows: (16-19) keV(19-22) keV(28-31) keV
5533 hours, 106Cd
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P. Cermak Rez 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 106Cd
• Negotiation on 106Cd lease extension
First direct measurement of EC/EC process in 106Cd (~ 6 x 1019 years)