Claudia Nones Physics of Massive Neutrinos - Blaubeuren, July 1 - 5, 2007 Status of Cuoricino and...
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Transcript of Claudia Nones Physics of Massive Neutrinos - Blaubeuren, July 1 - 5, 2007 Status of Cuoricino and...
Claudia Nones
Physics of Massive Neutrinos - Blaubeuren, July 1 - 5, 2007
Status of Cuoricino and CUOREwith some remarks on nuclear matrix elements
Centre de Spectrométrie Nucléaire etde Spectrométrie de Masse - Orsay
Brief remarks on the bolometric technique and the choice of 130Te as source of the 0vDBD
Cuoricino experiment: the detector and the updated results
CUORE project
Outline of the talk
Cuoricino vs HM ; 130Te vs other isotopes: comparisons through different N.M.E. calculations seen by the eyes of an experimentalist
Conclusions
deposited energy
heat sink
thermal couplingabsorber crystal
temperature sensor
Bolometric technique:
Main advantages:Main advantages:- high energy high energy resolutionresolution- wide flexibility (few wide flexibility (few constraints on constraints on absorber material)absorber material)- the detector is fully the detector is fully sensitive (no dead sensitive (no dead layer)layer)(also a drawback)(also a drawback)
From a very simple thermal model
-> to develop high pulses the detector has to work at low temperature (10mk)
Signal:∆T = E/C
Brief remarks
WHY WHY 130130Te ?Te ?
• high natural isotopic abundance (33.87 %)
• high transition energy (Q=2530.30 ± 1.99 keV)
- this means large phase space for the decay- the Q-value is important with respect to the natural radioactive background
• encouraging theoretical calculations for 0vDBD lifetime
Cuoricino and CUORE Location
Cuoricino experiment is installed in
Underground National Laboratory of Gran Sasso
L'Aquila – ITALY
the mountain providing a 3500 m.w.e. shield against cosmic rays
R&D final tests for CUORE (hall C)
CUORE (hall A)
Cuoricino(hall A)
It is a self-consistent experiment giving significant results on Double Beta Decay.
The Cuoricino detector
Total number of detectors: 62
total active mass
TeO2 : 40.7 kg
130Te : 11.3 kg
128Te : 10.5 kg
The Cuoricino detector
Neutrinoless DBD results (1)
Background sum spectrum of all the detectors in the DBD region
60Copile up
Energy (keV)
Cou
nts
130Te0vBB
MT = 11.83 kg 130Te y
UPDATED RESULTS:
T1/20v (y) > 3 1024
y mee< 0.2 – 0.98 eV
Bkg = 0.18±0.02 c/keV/kg/y
Neutrinoless DBD results (2)
Are we now able to scrutinize the HM claim of evidence?
… we will see in the last part of the talk!!!
MT = 11.83 kg 130Te y
FWHM measured on sum bkg spectrum @ 2.6
MeV ~ 7 keV
Cryogenic Underground Observatory for Rare Events
CUORE
CUORE status
Funded by the US
For the moment,
we are not late with respect to the master plan
Data taking foreseen in 2011
“PER ME SI VA NE LA CITTA’ DOLENTE, PER ME SI VA NE L’ETERNO DOLORE,
PER ME SI VA TRA LA PERDUTA GENTE. GIUSTIZIA MOSSE IL MIO ALTO FATTORE:
FECEMI LA DIVINA POTESTATE, LA SOMMA SAPIENZA E ‘L PRIMO AMORE.
DINANZI A ME NON FUR COSE CREATE
SE NON ETERNE, E IO ETERNA DURO.
LASCIATE OGNI SPERANZA, VOI CH’ENTRATE.” (Inferno, Canto III, vv. 1-9)
« THROUGH ME THE WAY TO THE CITY OF WOE,THROUGH ME THE WAY INTO ETERNAL PAIN,
THROUGH ME THE WAY AMONG THE LOST.JUSTICE MOVED MY MAKER ON HIGH.
DIVINE POWER MADE ME,
WISDOM SUPREME, AND PRIMAL LOVE.BEFORE ME NOTHING WAS
BUT THINGS ETERNAL,AND I ENDURE ETERNALLY.
ABANDON ALL HOPE, YOU WHO ENTER HERE. »
The world of the Nuclear Matrix Elements through the eyes of an experimentalist
Thanks to A. Poves, V. Rodin and
J. Suhonen for th
eir help…in this
hell!!!
QRPA or not QRPA?…this is the question!!!
QRPA
Shell Model
J. Suhonen – O. Civitarese and the Jyväskylä group
A. Faessler and the Tuebingen group
Prof. Faessler’s advice:
« Do not take democratic averaged matrix elements »
… but so what can we do with our value of T0v
1/2? to evaluate mv
to scrutinize the HM result
to compare next generation experiments
E. Caurier, F. Nowacki, A. Poves, et al.
Cuoricino prospects
Are we able now to scrutinize the HM claim of evidence?
T1/20v (y) = (0.69-4.18) 1025 (3σ range)
mee= 0.24 – 0.58 eV (3σ range)
HM experimental results:
REF. Klapdor et al., Physics Letters B 586 (2004) 198-212Best value: 1.19x1025 y
What I have done…
T1/20v
(Klapdor)T1/2
0v (130Te)Choose a nuclear model
2
0
)(
0
)(0
0
02/11300
2/1
76
130
76
130
)()(
v
GerefA
v
TerefAv
Ge
v
Te
vv
M
M
G
G
KlapdorTTeT
Nuclear matrix element of Muto-Bender-Klapdor
References
Tuebingen’s group: erratum of nucl-th/0503063
Suhonen’s group: nucl-th/0208005
Shell Model: Poves’ talk @ 4th ILIAS Annual Meeting - Chambery
0
1
2
3
4
0 2 4 6 8 10 12
T1/2 x 1024 y for 130Te
Nu
cle
ar
mod
els
Jyväskylä group
Shell model group
Tuebingen group
N.B.: No univoque definition of G0v and M0v!!!
Cuoricino limit vs Klapdor’s claim of evidence
3x1024 y 6x1024 yFinal sensitivity
The main goal of CUORE is to test the inverted hierarchy
213 mmm meVmee )5019(
And what about CUORE? (1)
b
TM
A
aF ~0
b
TM
A
aF ~0
a: isotopic abundance
A: atomic mass
ε: efficiency
M: active mass [kg]
T: live time [y]
b: background [c/keV/kg/y]
Γ: energy resolution [keV]
CUORE_conservative
b=0.01 – Γ=5 – T=5y
CUORE_aggressive
b=0.001 – Γ=5 – T=5y
F0v = 2.1 x 1026 y (1σ)
F0v = 6.6 x 1026 y (1σ)
And what about CUORE? (2)
CUORE and the inverted hierarchy
0
1
2
3
4
0 5 10 15 20 25 30 35
T1/2 x 1026 y for 130Te
Nu
cle
ar
mod
els
CUORE_conservative
CUORE_aggressive
Tuebingen group
Shell Model group
Jyväskylä group
0
1
2
3
4
0 10 1000
Summarizing
Tuebingen group
Shell Model group
Jyväskylä group
Cuoricino
CUORE_conservative CUORE_aggressive
T1/2 x 1024 y for 130Te
Isotope Q_value (keV)Isotopic
abundance (%)
48Ca 4271 0.003576Ge 2039 9.282Se 2995 9.2
100Mo 3034 9.6116Cd 2802 7.5130Te 2530 33.8136Xe 2479 8.9
What about 130Te compared with other isotopes?
a) I fix the range of the mass -> inverted hierarchy (19-50 meV)
b) I use the 3 main “schools of thoughts” in terms of N.M.E.
c) I compare the capability to explore the inverted hierarchy region
ReferencesTuebingen’s group: erratum of nucl-th/0503063
Suhonen’s group: nucl-th/0208005
Shell Model: Poves’ talk @ 4th ILIAS Annual Meeting - Chambery
RQRPA (erratum) – Tuebingen group
0
1
2
3
4
5
6
7
8
0 1 10 100 1000
T1/2 x 1026 y
150Nd
130Te
116Cd
76Ge
136Xe
82Se
100Mo
G0v calculates with gA=1.25 and r0=1.1fm
QRPA – Suhonen’s group
G0v calculates with gA=1.25 and r0=1.2fm
0
1
2
3
4
5
6
7
1 10 100 1000
T1/2 x 1026 y
130Te
116Cd
76Ge
136Xe
100Mo
82Se
Shell Model group
G0v calculates with gA=1.25 and r0=1.2fm
0
1
2
3
4
5
6
1 10 100 1000
T1/2 x 1026 y
130Te
116Cd
76Ge
136Xe
82Se
Conclusions
Cuoricino is presently the most sensitive 0νDBD running experiment, capable to confirm the KK-HM “evidence”.
Cuoricino demonstrates the feasibility of a large scale bolometric detector (CUORE) with good energy resolution and bkg on many detectors.
CUORE, a second generation detector, will be built and start up in the next 4 years.
Recent results on background suppression confirm the capability to attack the inverted hierarchy mass region.
Isotope G0v (gA=1.25 r0=1.2fm)
G0v (gA=1.25 r0=1.1fm)
76Ge 6.31x10-15 7.92x10-15
82Se 2.73x10-14 3.52x10-14
100Mo 4.42x10-14 5.73x10-14
116Cd 4.68x10-14 6.22x10-14
130Te 4.14x10-14 5.54x10-14
136Xe 4.37x10-14 5.91x10-14
150Nd 1.94x10-13 2.70x10-13
There is a difference of about 25%
Unit:y Suhonen + SM Rodin
Isotope suhonen shell modeltubingen (QRPA gA=1)
erratum_tubingen (RQRPA gA=1.25)
130Te 3,49 2,41 1,36 2,95
116Cd 3,75 2,94 1,31 2,42
76Ge 3,33 2,58 2,48 3,92
136Xe 4,64 2 0,94 1,97
82Se 3,44 2,49 2,1 3,49
100Mo 2,97 1,24 2,78
150Nd 1,96 4,16