140 research outputs found
Search for neutrinoless double-beta decay with CUORE
The CUORE (Cryogenic Underground Observatory for Rare Events) experiment, hosted at Gran Sasso National Laboratories in Italy, is a ton-scale cryogenic experiment designed for the search for neutrinoless double beta decay of 130Te. The first results on 0νββ decay of 130Te, from the analysis on the two months of CUORE science runs acquired in 2017, will be presented
Performance of the CUORE bolometers —First CUORE results
The CUORE (Cryogenic Underground Observatory for Rare Events) Experiment is a ton-scale bolometric detector based at the Gran Sasso National Laboratories in central Italy. The goal of the experiment is to investigate the 0νββ decay of 130Te. CUORE started pre-operation runs in January 2017. First science runs were carried out in early Spring 2017. Two optimization campaigns followed in order to set the best operating conditions for the 0νββ search
The CUORE cryostat: an infrastructure for rare event searches at millikelvin temperatures
The CUORE experiment is the world's largest bolometric experiment. The
detector consists of an array of 988 TeO2 crystals, for a total mass of 742 kg.
CUORE is presently taking data at the Laboratori Nazionali del Gran Sasso,
Italy, searching for the neutrinoless double beta decay of 130Te. A large
custom cryogen-free cryostat allows reaching and maintaining a base temperature
of about 10 mK, required for the optimal operation of the detector. This
apparatus has been designed in order to achieve a low noise environment, with
minimal contribution to the radioactive background for the experiment. In this
paper, we present an overview of the CUORE cryostat, together with a
description of all its sub-systems, focusing on the solutions identified to
satisfy the stringent requirements. We briefly illustrate the various phases of
the cryostat commissioning and highlight the relevant steps and milestones
achieved each time. Finally, we describe the successful cooldown of CUORE
First search for Lorentz violation in double beta decay with scintillating calorimeters
We present the search for Lorentz violation in the double beta decay of Se-82 with CUPID-0, using an exposure of 9.95 kg x yr. We found no evidence for the searched signal and set a limit on the isotropic components of the Lorentz violating coefficient of (a) over circle ((3))(of) ((3))(of) obtained with a scintillating bolometer, showing the potentiality of this technique
Measurement of the (, Ar) total hadronic cross section at the LArIAT experiment
We present the first measurement of the negative pion total hadronic cross
section on argon, which we performed at the Liquid Argon In A Testbeam (LArIAT)
experiment. All hadronic reaction channels, as well as hadronic elastic
interactions with scattering angle greater than 5~degrees are included. The
pions have a kinetic energies in the range 100-700~MeV and are produced by a
beam of charged particles impinging on a solid target at the Fermilab Test Beam
Facility. LArIAT employs a 0.24~ton active mass Liquid Argon Time Projection
Chamber (LArTPC) to measure the pion hadronic interactions. For this
measurement, LArIAT has developed the ``thin slice method", a new technique to
measure cross sections with LArTPCs. While generally higher than the
prediction, our measurement of the (,Ar) total hadronic cross section is
in agreement with the prediction of the Geant4 model when considering a model
uncertainty of 5.1\%.Comment: 15 pages, 15 figures, 3 tables, accepted by PR
The Liquid Argon In A Testbeam (LArIAT) Experiment
The LArIAT liquid argon time projection chamber, placed in a tertiary beam of
charged particles at the Fermilab Test Beam Facility, has collected large
samples of pions, muons, electrons, protons, and kaons in the momentum range
300-1400 MeV/c. This paper describes the main aspects of the detector and
beamline, and also reports on calibrations performed for the detector and
beamline components
Twelve-crystal prototype of LiMoO scintillating bolometers for CUPID and CROSS experiments
An array of twelve 0.28 kg lithium molybdate (LMO) low-temperature bolometers
equipped with 16 bolometric Ge light detectors, aiming at optimization of
detector structure for CROSS and CUPID double-beta decay experiments, was
constructed and tested in a low-background pulse-tube-based cryostat at the
Canfranc underground laboratory in Spain. Performance of the scintillating
bolometers was studied depending on the size of phonon NTD-Ge sensors glued to
both LMO and Ge absorbers, shape of the Ge light detectors (circular vs.
square, from two suppliers), in different light collection conditions (with and
without reflector, with aluminum coated LMO crystal surface). The scintillating
bolometer array was operated over 8 months in the low-background conditions
that allowed to probe a very low, Bq/kg, level of the LMO crystals
radioactive contamination by Th and Ra.Comment: Prepared for submission to JINST; 23 pages, 9 figures, and 4 table
CUORE: The first bolometric experiment at the ton scale for the search for neutrino-less double beta decay
The Cryogenic Underground Observatory for Rare Events (CUORE) is the most massive bolometric experiment searching for neutrino-less double beta (0νββ) decay. The detector consists of an array of 988 TeO crystals (742 kg) arranged in a compact cylindrical structure of 19 towers. This paper will describe the CUORE experiment, including the cryostat, and present the detector performance during the first year of running. Additional detail will describe the effort made in improving the energy resolution in the Te 0νββ decay region of interest (ROI) and the suppression of backgrounds. A description of work to lower the energy threshold in order to give CUORE the sensitivity to search for other rare events, such as dark matter, will also be provided. 2 13
A first test of CUPID prototypal light detectors with NTD-Ge sensors in a pulse-tube cryostat
CUPID is a next-generation bolometric experiment aiming at searching for
neutrinoless double-beta decay with ~250 kg of isotopic mass of Mo. It
will operate at 10 mK in a cryostat currently hosting a similar-scale
bolometric array for the CUORE experiment at the Gran Sasso National Laboratory
(Italy). CUPID will be based on large-volume scintillating bolometers
consisting of Mo-enriched LiMoO crystals, facing thin
Ge-wafer-based bolometric light detectors. In the CUPID design, the detector
structure is novel and needs to be validated. In particular, the CUORE cryostat
presents a high level of mechanical vibrations due to the use of pulse tubes
and the effect of vibrations on the detector performance must be investigated.
In this paper we report the first test of the CUPID-design bolometric light
detectors with NTD-Ge sensors in a dilution refrigerator equipped with a pulse
tube in an above-ground lab. Light detectors are characterized in terms of
sensitivity, energy resolution, pulse time constants, and noise power spectrum.
Despite the challenging noisy environment due to pulse-tube-induced vibrations,
we demonstrate that all the four tested light detectors comply with the CUPID
goal in terms of intrinsic energy resolution of 100 eV RMS baseline noise.
Indeed, we have measured 70--90 eV RMS for the four devices, which show an
excellent reproducibility. We have also obtained outstanding energy resolutions
at the 356 keV line from a Ba source with one light detector achieving
0.71(5) keV FWHM, which is -- to our knowledge -- the best ever obtained when
compared to detectors of any technology in this energy range.Comment: Prepared for submission to JINST; 16 pages, 7 figures, and 1 tabl
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