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Research Program of JINR at LSM

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V. Egorov
V. Egorov
JINR
=
+
LSM
The love story
пЃ¬ 1991
Orsay
S.Jullian and D.Lalanne proposed
to bring our 2ОІ-spectrometer to Modane
пЃ¬ 1993
TGV
TGV-1 (1994 – 2000)
Stack of 16 HPGe planar detectors
пѓ†58mm (sensitive area = 12 cm2)
Total area of samples п‚» 100 cm2
пЃ¬ 7 samples of natCa
пЃ¬ 8 samples of enriched 48Ca:
1.08 g  1.35•1022 atoms
CaCO3 ( 41 mg/cm2 )
пЃ¬
пЃ¬
NIM A372 (1996) 222
TGV-1 results
20
20
nat
18
C a R egion -O f-In terest
18
16
16
14
14
12
12
10
10
8
8
6
6
4
4
Zero
2
0
2000
2500
3000
3500
48
C a R egion -O f-In terest
T1/2 (2пЃў2пЃ®) =
=(2.97.5)•1019 y
T1/2 (2пЃў0пЃ®) п‚і
 1.5•1021 y
(90%CL)
2
4000
0
2000
2500
3000
3500
4000
The love story
пЃ¬ 1994
We had produced one (of two)
scintillator wall for the NEMO-2
Started to prepare NEMO-3
Participation of JINR in NEMO-3
6 tons of plastic scintillator (both
internal and external walls)
пЃ¬ Big-dimensional Cu and Fe details of
the sectors
пЃ¬ Fe shielding
пЃ¬ Enriched isotopes: 48Ca 96Zr 150Nd
 Mounting, cabling, tuning, …
пЃ¬ Software for the data analysis
пЃ¬ Calibration, analysis
пЃ¬
The love story
пЃ¬ 2000
Dramatic upgrade of TGV (TGV-2)
TGV-2 (2000 – …)
B o ra te d P o ly e th y le n e
LN2
N2
Cu
SM
LN D ew ar
T G V -2
S ig n a l w ire s
C o ld fin g e r
PA
Pb
1 m
TGV-2 (2000 – …)
пЃ¬
Stack of 32 HPGe planar detectors
пѓ†60 mm (sensitive area : 20 cm2)
Total area of samples : 330 cm2
Total mass of sample(s) : 10 п‚ё 20 g
Total efficiency : 40 п‚ё 50 %
E-resolution : 3 п‚ё 4 keV @ 60Co
LE-threshold : 40 п‚ё 50 keV (5 п‚ё 6 keV)
пЃ¬ 16 samples of 48Ca (10 g) :
20 g CaF2 + CH2 ( 60 mg / cm2 )
пЃ¬ 16 samples of 106Cd:
10 g Cd ( 30 mg / cm2 )
Nuclei - candidates
0
T1/2(5-forbidden пЃў)
+
48
48
20
Ca
Ca
п‚®
0.187%
6
2e пЂ«
106
48
Cd п‚®
+
48
48
22
1+
Sc
106
46
106
Pd пЂ« 2 пЃ® e
Ag
Ti пЂ« 2 пЃ®~e пЂ« 2 e пЂ« ( пЃ§ )
пЂ­
Q (2 пЃў )= 4 .2 7 M e V
0+
0+
48
0
+
106
Cd
1.25%
Q (2 E C )= 2 .7 8 M e V
106
Pd
Ti
Purification procedure (ion-exchange technique).
20 g of 48Ca have been purified:
k (Co, Ra, Eu) = (1.310)•103
2 X-rays
The love story
пЃ¬ 2005
E.Yakushev в†’ EDELWEISS
Participation of JINR in EDELWIESS-2
пЃ¬
Background environment control
- Rn detector
- Low-background n-detectors
(internal background ≈ 0.4 counts per day)
пЃ¬
Assembling, commissioning, running
(calibrations, tests, etc)
пЃ¬
Direct beta calibrations (MC and
interpretation)
The love story
пЃ¬ 2005
Super-Heavy In Nature (SHIN)
looking for multi-neutron events
пЃ¬ 2010 eka-Os в†’ eka-Xe
The love story (be continued)
пЃ¬ NEMO
в†’ SuperNEMO (+BiPo)
calorimeter
calibration system
software
The love story (be continued)
пЃ¬
TGV
2010: finish 2EC of 106Cd
Search for Solar Axion with 57Fe
пЃ¬
Low-threshold Ge detectors
(coherent пЃ®-e scattering, NMM, etc.)
2.9 – 3.0 keV threshold is not enough low…
250 g ~400 eV (в†’250 eV)
450 g
stack ОЈ10 kg (TGV cryostat is perfectly suited for
the low-background tests)
Relic neutrino?...
пЃ®
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