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.
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
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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.
The CUORE experiment is a ton-scale array of
TeO
2
cryogenic bolometers located at the underground Laboratori Nazionali del Gran Sasso of Istituto Nazionale di Fisica Nucleare (INFN), in Italy. The ...CUORE detector consists of 988 crystals operated as source and detector at a base temperature of
∼
10
mK. Such cryogenic temperature is reached and maintained by means of a custom built cryogen-free dilution cryostat, designed with the aim of minimizing the vibrational noise and the environmental radioactivity. The primary goal of CUORE is the search for neutrinoless double beta decay of
130
Te
, but thanks to its large target mass and ultra-low background it is suitable for the study of other rare processes as well, such as the neutrinoless double beta decay of
128
Te
. This tellurium isotope is an attractive candidate for the search of this process, due to its high natural isotopic abundance of 31.75%. The transition energy at (866.7 ± 0.7) keV lies in a highly populated region of the energy spectrum, dominated by the contribution of the two-neutrino double beta decay of
130
Te
. As the first ton-scale infrastructure operating cryogenic
TeO
2
bolometers in stable conditions, CUORE is able to achieve a factor
>
10
higher sensitivity to the neutrinoless double beta decay of this isotope with respect to past direct experiments.
The CUORE Cryostat D’Addabbo, A.; Alduino, C.; Bersani, A. ...
Journal of low temperature physics,
12/2018, Letnik:
193, Številka:
5-6
Journal Article
Recenzirano
Odprti dostop
The Cryogenic Underground Observatory for Rare Events (CUORE) is a bolometric experiment for neutrinoless double-beta decay in
130
Te
search, currently taking data at the underground facility of ...Laboratori Nazionali del Gran Sasso (LNGS). The CUORE cryostat successfully cooled down a mass of about 1 ton at
∼
7
mK
, delivering a uniform and constant base temperature. This result marks a fundamental milestone in low-temperature detector techniques, opening the path for future ton-scale bolometric experiments searching for rare events. In this paper, we present the CUORE cryogenic infrastructure, briefly describing its critical subsystems.
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