CUORE sensitivity to $$0\nu \beta \beta $$ decay Alduino, C.; Alfonso, K.; Artusa, D. R. ...
The European physical journal. C, Particles and fields,
08/2017, Letnik:
77, Številka:
8
Journal Article
Recenzirano
Odprti dostop
We report a study of the CUORE sensitivity to neutrinoless double beta (0νββ) decay. We used a Bayesian analysis based on a toy Monte Carlo (MC) approach to extract the exclusion sensitivity to the ...0νββ decay half-life (T1/20ν) at 90% credibility interval (CI) – i.e. the interval containing the true value of T1/20ν with 90% probability – and the 3σ discovery sensitivity. We consider various background levels and energy resolutions, and describe the influence of the data division in subsets with different background levels. If the background level and the energy resolution meet the expectation, CUORE will reach a 90% CI exclusion sensitivity of 2·1025 year with 3 months, and 9·1025 year with 5 years of live time. Under the same conditions, the discovery sensitivity after 3 months and 5 years will be 7·1024 year and 4·1025 year, respectively.
The CUORE experiment is a large bolometric array searching for the lepton number violating neutrino-less double beta decay (
0
ν
β
β
) in the isotope
130
Te
. In this work we present the latest ...results on two searches for the double beta decay (DBD) of
130
Te
to the first
0
2
+
excited state of
130
Xe
: the
0
ν
β
β
decay and the Standard Model-allowed two-neutrinos double beta decay (
2
ν
β
β
). Both searches are based on a 372.5 kg
×
yr TeO
2
exposure. The de-excitation gamma rays emitted by the excited Xe nucleus in the final state yield a unique signature, which can be searched for with low background by studying coincident events in two or more bolometers. The closely packed arrangement of the CUORE crystals constitutes a significant advantage in this regard. The median limit setting sensitivities at 90% Credible Interval (C.I.) of the given searches were estimated as
S
1
/
2
0
ν
=
5.6
×
10
24
yr
for the
0
ν
β
β
decay and
S
1
/
2
2
ν
=
2.1
×
10
24
yr
for the
2
ν
β
β
decay. No significant evidence for either of the decay modes was observed and a Bayesian lower bound at
90
%
C.I. on the decay half lives is obtained as:
(
T
1
/
2
)
0
2
+
0
ν
>
5.9
×
10
24
yr
for the
0
ν
β
β
mode and
(
T
1
/
2
)
0
2
+
2
ν
>
1.3
×
10
24
yr
for the
2
ν
β
β
mode. These represent the most stringent limits on the DBD of
130
Te to excited states and improve by a factor
∼
5
the previous results on this process.
We report the measurement of the two-neutrino double-beta (
2
ν
β
β
) decay of
100
Mo to the ground state of
100
Ru using lithium molybdate (
Li
2
100
MoO
4
) scintillating bolometers. The detectors ...were developed for the CUPID-Mo program and operated at the EDELWEISS-III low background facility in the Modane underground laboratory (France). From a total exposure of 42.235 kg
×
day, the half-life of
100
Mo is determined to be
T
1
/
2
2
ν
=
7
.
12
-
0.14
+
0.18
(
stat
.
)
±
0.10
(
syst
.
)
×
10
18
years. This is the most accurate determination of the
2
ν
β
β
half-life of
100
Mo to date.
The CUORE experiment, a ton-scale cryogenic bolometer array, recently began operation at the Laboratori Nazionali del Gran Sasso in Italy. The array represents a significant advancement in this ...technology, and in this work we apply it for the first time to a high-sensitivity search for a lepton-number-violating process: ^{130}Te neutrinoless double-beta decay. Examining a total TeO_{2} exposure of 86.3 kg yr, characterized by an effective energy resolution of (7.7±0.5) keV FWHM and a background in the region of interest of (0.014±0.002) counts/(keV kg yr), we find no evidence for neutrinoless double-beta decay. Including systematic uncertainties, we place a lower limit on the decay half-life of T_{1/2}^{0ν}(^{130}Te)>1.3×10^{25} yr (90% C.L.); the median statistical sensitivity of this search is 7.0×10^{24} yr. Combining this result with those of two earlier experiments, Cuoricino and CUORE-0, we find T_{1/2}^{0ν}(^{130}Te)>1.5×10^{25} yr (90% C.L.), which is the most stringent limit to date on this decay. Interpreting this result as a limit on the effective Majorana neutrino mass, we find m_{ββ}<(110-520) meV, where the range reflects the nuclear matrix element estimates employed.
The CUORE Detector and Results Nutini, Irene; Adams, D. Q.; Alfonso, K. ...
Journal of low temperature physics,
2020/4, Letnik:
199, Številka:
1-2
Journal Article
Recenzirano
Odprti dostop
The cryogenic underground observatory for rare events (CUORE) is a cryogenic experiment searching for neutrinoless double beta decay (
0
ν
β
β
) of
130
Te
. The detector consists of an array of
988
...TeO
2
crystals arranged in a compact cylindrical structure of 19 towers. We report the CUORE initial operations and optimization campaigns. We then present the CUORE results on
0
ν
β
β
and
2
ν
β
β
decay of
130
Te
obtained from the analysis of the physics data acquired in 2017.
Latest Results from the CUORE Experiment Nutini, I.; Adams, D. Q.; Alfonso, K. ...
Journal of low temperature physics,
12/2022, Letnik:
209, Številka:
5-6
Journal Article
Recenzirano
Odprti dostop
The Cryogenic Underground Observatory for Rare Events (CUORE) is the first cryogenic experiment searching for
0
ν
β
β
decay that has been able to reach the one-tonne mass scale. The detector, located ...at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy, consists of an array of 988
TeO
2
crystals arranged in a compact cylindrical structure of 19 towers. CUORE began its first physics data run in 2017 at a base temperature of about 10 mK and in April 2021 released its
3
rd
result of the search for
0
ν
β
β
, corresponding to a tonne-year of
TeO
2
exposure. This is the largest amount of data ever acquired with a solid state detector and the most sensitive measurement of
0
ν
β
β
decay in
130
Te
ever conducted . We present the current status of CUORE search for
0
ν
β
β
with the updated statistics of one tonne-yr. We finally give an update of the CUORE background model and the measurement of the
130
Te
2
ν
β
β
decay half-life and decay to excited states of
130
Xe
, studies performed using an exposure of 300.7 kg yr.
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