Showing 1–21 of 21 results for author: Armatol, A

Characterization of Aluminum Microwave SQUID Multiplexers for CE$ν$NS Detection

Authors: James Amidei, Antoine Armatol, Corinne Augier, Louis Bailly-Salins, Guillaume Baulieu, Laurent Bergé, Julien Billard, Juliette Blé, Gaby Brenot, Guillaume Bres, Jean-Louis Bret, Alexandre Broniatowski, Martino Calvo, Antonella Cavanna, Antoine Cazes, Emanuela Celi, David Chaize, Mohammed Chala, Maurice Chapellier, Luke Chaplinsky, Ran Chen, Ion Cojocari, Jules Colas, Laurent Couraud, Elspeth Cudmore , et al. (70 additional authors not shown)

Abstract: We present the design, fabrication, and characterization of an aluminum-based six-channel microwave SQUID multiplexer ($μ$MUX) prototype for transition-edge sensor (TES) readout in the RICOCHET experiment. The device consists of aluminum coplanar-waveguide resonators and RF SQUIDs with Dolan-style Al/AlO$_x$/Al Josephson junctions. By measuring the resonator scattering parameters at a range of pro… ▽ More We present the design, fabrication, and characterization of an aluminum-based six-channel microwave SQUID multiplexer ($μ$MUX) prototype for transition-edge sensor (TES) readout in the RICOCHET experiment. The device consists of aluminum coplanar-waveguide resonators and RF SQUIDs with Dolan-style Al/AlO$_x$/Al Josephson junctions. By measuring the resonator scattering parameters at a range of probe tone frequencies, powers, and flux bias points, we demonstrate agreement between the device response and existing multiplexer models. We also characterize the noise performance in both open-loop and flux-ramping modes. With a high electron mobility transistor (HEMT) amplifier, open-loop measurements yield a flux sensitivity of 1-1.5 $μΦ_0/\sqrt{Hz}$. With flux-ramp modulation, low-frequency 1/f noise is suppressed, and the flux sensitivity is around 3-4 $μΦ_0/\sqrt{Hz}$, corresponding to a current sensitivity of 24-33 $pA/\sqrt{Hz}$ at the input coil. We further demonstrate a reduction in readout noise by incorporating a Josephson traveling-wave parametric amplifier (JTWPA) between the $μ$MUX and the HEMT. This achieves an open-loop flux sensitivity of 0.3-0.6 $μΦ_0/\sqrt{Hz}$ and an effective system noise temperature below 1 K. These results establish aluminum $μ$MUX devices as a viable and extensible readout technology for low-noise cryogenic detector arrays. △ Less

Submitted 22 May, 2026; originally announced May 2026.

Low Energy Phonon Bursts Created By Fast Neutron Damage

Authors: A. Armatol, C. Augier, L. Bergé, J. Billard, H. J. Birch, J. Blé, C. L. Chang, Y. -Y. Chang, L. Chaplinsky, G. Cline, A. Cochard, I. Cojocari, J. Colas, M. De Jesus, P. de Marcillac, K. Dwinger, R. Faure, S. Fiorucci, M. Garcia-Sciveres, J. Gascon, C. Girard-Carillo, W. Guo, L. Haegel, S. J. Haselschwardt, S. A. Hertel , et al. (45 additional authors not shown)

Abstract: Solid state athermal phonon calorimeters used in the search for low mass dark matter or coherent neutrino-nucleus interactions have long observed a large excess of events below several hundred eV. The relaxation of damage created by the interaction of fast cosmic ray neutrons with the detector has been proposed as a source of these excess events. By comparing neutron exposed detectors to control d… ▽ More Solid state athermal phonon calorimeters used in the search for low mass dark matter or coherent neutrino-nucleus interactions have long observed a large excess of events below several hundred eV. The relaxation of damage created by the interaction of fast cosmic ray neutrons with the detector has been proposed as a source of these excess events. By comparing neutron exposed detectors to control detectors, we report the first measurement of phonon bursts caused by damage created by fast neutrons. Differences in the spectral shape, the rate dependence on thermal history, and the observed spectral rate scaled to the neutron exposure between irradiated and control detectors suggest that our observed LEE backgrounds are not dominated by neutron damage-induced phonon bursts. △ Less

Submitted 18 March, 2026; originally announced March 2026.

Reconstruction of cosmic-ray muon events with CUORE

Authors: CUORE Collaboration, D. Q. Adams, C. Alduino, K. Alfonso, A. Armatol, F. T. Avignone III, O. Azzolini, G. Bari, F. Bellini, G. Benato, M. Beretta, M. Biassoni, A. Branca, D. Brandani, C. Brofferio, C. Bucci, J. Camilleri, A. Caminata, A. Campani, J. Cao, S. Capelli, L. Cappelli, L. Cardani, P. Carniti, N. Casali , et al. (96 additional authors not shown)

Abstract: We report the in-situ 3D reconstruction of through-going muons in the CUORE experiment, a cryogenic calorimeter array searching for neutrinoless double beta ($0νββ$) decay, leveraging the segmentation of the detector. Due to the slow time response of the detector, time-of-flight estimation is not feasible. Therefore, the track reconstruction is performed using a multi-objective optimization algori… ▽ More We report the in-situ 3D reconstruction of through-going muons in the CUORE experiment, a cryogenic calorimeter array searching for neutrinoless double beta ($0νββ$) decay, leveraging the segmentation of the detector. Due to the slow time response of the detector, time-of-flight estimation is not feasible. Therefore, the track reconstruction is performed using a multi-objective optimization algorithm that relies on geometrical information from the detector as a whole. We measure the integral flux of cosmic-ray muons underground at the {\it Laboratori Nazionali del Gran Sasso}, and find our value to be in good agreement with other experiments that have performed a similar measurement. To our knowledge, this work represents the first demonstration of 3D particle tracking and reconstruction of through-going muons with per-event angular determination in a millikelvin cryogenic detector array. The analysis performed for this work will be critical for validating the muon-related background in CUPID, a next-generation $0νββ$ experiment, and for follow-up studies on detector response and on delayed products induced by cosmic-ray muons. △ Less

Submitted 4 June, 2026; v1 submitted 5 September, 2025; originally announced September 2025.

Comments: Accepted by EPJC. Manuscript updated with minor corrections from the peer-review process

Characterization of mini-CryoCube detectors from the Ricochet experiment commissioning at the Institut Laue-Langevin

Authors: Antoine Armatol, Corinne Augier, Louis Bailly-Salins, Guillaume Baulieu, Laurent Bergé, Julien Billard, Juliette Blé, Guillaume Bres, Jean-Louis Bret, Alexandre Broniatowski, Martino Calvo, Antonella Cavanna, Antoine Cazes, Emanuela Celi, David Chaize, Mohammed Chala, Maurice Chappellier, Luke Chaplinsky, Guillaume Chemin, Ran Chen, Jules Colas, Laurent Couraud, Elspeth Cudmore, Maryvonne De Jesus, Nicole Dombrowski , et al. (61 additional authors not shown)

Abstract: The Ricochet experiment aims to measure the coherent elastic neutrino-nucleus scattering process from antineutrinos emitted by a research nuclear reactor operated by the Institut Laue-Langevin (Grenoble, France). This article presents a description of the Ricochet experimental installation and the detector performance achieved during its commissioning with a mini-CryoCube module consisting of thre… ▽ More The Ricochet experiment aims to measure the coherent elastic neutrino-nucleus scattering process from antineutrinos emitted by a research nuclear reactor operated by the Institut Laue-Langevin (Grenoble, France). This article presents a description of the Ricochet experimental installation and the detector performance achieved during its commissioning with a mini-CryoCube module consisting of three 42-gram germanium cryogenic calorimeters. The baseline resolutions and background levels are reported both during reactor-on and reactor-off periods, and as noise mitigation techniques were improved. A baseline resolution of 40 eV electron equivalent was achieved for the ionization channel after setup improvements, and the phonon channel resolutions ranged from 50 to 80 eV of total phonon energy. In the energy region from 2 to 7 keV, a nuclear recoil rate of 15(2) events/(kg day keV) is measured during the reactor-off period selecting events in coincidence with muon veto signals. This rate is in agreement with the cosmogenic neutron rate calculated from GEANT4 simulations. After the rejection of events in coincidence with signals in the muon veto detectors, a combined 90% C.L. limit on the nuclear recoil background of < 9 events/(kg day keV) is obtained in that energy region during the reactor-on period, which is compatible with our GEANT4 model calculation corresponding to a total rate of 5 events/(kg day keV). The sensitivity of this analysis was however found to be limited by a surface event contamination which is currently being addressed by the Ricochet Collaboration with upgraded detectors. △ Less

Submitted 30 July, 2025; originally announced July 2025.

Comments: 16 pages, 9 figures

Journal ref: Phys. Rev. D 112, 112019 (2025)

Cryogenic light detectors with thermal signal amplification for $0νββ$ search experiments

Authors: A. Armatol, A. S. Barabash, D. Baudin, V. Berest, M. Beretta, L. Bergé, M. Buchynska, J. M. Calvo-Mozota, C. Capelli, P. Carniti, M. Chapellier, I. Dafinei, F. A. Danevich, T. Dixon, A. Drobizhev, L. Dumoulin, F. Ferri, A. Gallas, A. Giuliani, C. Gotti, Ph. Gras, A. Ianni, L. Imbert, H. Khalife, V. V. Kobychev , et al. (22 additional authors not shown)

Abstract: As a step towards the realization of cryogenic-detector experiments to search for neutrinoless double-beta decay (such as CROSS, BINGO, and CUPID), we investigated a batch of 10 Ge light detectors (LDs) assisted by Neganov-Trofimov-Luke (NTL) signal amplification. Each LD was assembled with a large cubic light-emitting crystal (45 mm side) using the recently developed CROSS mechanical structure. T… ▽ More As a step towards the realization of cryogenic-detector experiments to search for neutrinoless double-beta decay (such as CROSS, BINGO, and CUPID), we investigated a batch of 10 Ge light detectors (LDs) assisted by Neganov-Trofimov-Luke (NTL) signal amplification. Each LD was assembled with a large cubic light-emitting crystal (45 mm side) using the recently developed CROSS mechanical structure. The detector array was operated at milli-Kelvin temperatures in a pulse-tube cryostat at the Canfranc underground laboratory in Spain. We achieved good performance with scintillating bolometers from CROSS, made of Li$_{2}$$^{100}$MoO$_4$ crystals and used as reference detectors of the setup, and with all LDs tested (except for a single device that encountered an electronics issue). No leakage current was observed for 8 LDs with an electrode bias up to 100 V. Operating the LDs at an 80 V electrode bias applied in parallel, we obtained a gain of around 9 in the signal-to-noise ratio of these devices, allowing us to achieve a baseline noise RMS of $O$(10 eV). Thanks to the strong current polarization of the temperature sensors, the time response of the devices was reduced to around half a millisecond in rise time. The achieved performance of the LDs was extrapolated via simulations of pile-up rejection capability for several configurations of the CUPID detector structure. Despite the sub-optimal noise conditions of the LDs (particularly at high frequencies), we demonstrated that the NTL technology provides a viable solution for background reduction in CUPID. △ Less

Submitted 21 July, 2025; originally announced July 2025.

Comments: Prepared for submission to JHEP; 33 pages, 13 figures, and 6 tables

Journal ref: JINST 21 (2026) P01035

Exploring the keV-scale physics potential of CUORE

Authors: CUORE Collaboration, D. Q. Adams, C. Alduino, K. Alfonso, A. Armatol, F. T. Avignone III, O. Azzolini, G. Bari, F. Bellini, G. Benato, M. Beretta, M. Biassoni, A. Branca, C. Brofferio, C. Bucci, J. Camilleri, A. Caminata, A. Campani, J. Cao, C. Capelli, S. Capelli, L. Cappelli, L. Cardani, P. Carniti, N. Casali , et al. (98 additional authors not shown)

Abstract: We present the analysis techniques developed to explore the keV-scale energy region of the CUORE experiment, based on more than 2 tonne yr of data collected over 5 years. By prioritizing a stricter selection over a larger exposure, we are able to optimize data selection for thresholds at 10 keV and 3 keV with 691 kg yr and 11 kg yr of data, respectively. We study how the performance varies among t… ▽ More We present the analysis techniques developed to explore the keV-scale energy region of the CUORE experiment, based on more than 2 tonne yr of data collected over 5 years. By prioritizing a stricter selection over a larger exposure, we are able to optimize data selection for thresholds at 10 keV and 3 keV with 691 kg yr and 11 kg yr of data, respectively. We study how the performance varies among the 988-detector array with different detector characteristics and data taking conditions. We achieve an average baseline resolution of 2.54 $\pm$ 0.14 keV FWHM and 1.18 $\pm$ 0.02 keV FWHM for the data selection at 10 keV and 3 keV, respectively. The analysis methods employed reduce the overall background by about an order of magnitude, reaching 2.06 $\pm$ 0.05 counts/(keV kg days) and 16 $\pm$ 2 counts/(keV kg days) at the thresholds of 10 keV and 3 keV. We evaluate for the first time the near-threshold reconstruction efficiencies of the CUORE experiment, and find these to be 26 $\pm$ 4 \% and 50 $\pm$ 2 \% at 3 keV and 10 keV, respectively. This analysis provides crucial insights into rare decay studies, new physics searches, and keV-scale background modeling with CUORE. We demonstrate that tonne-scale cryogenic calorimeters can operate across a wide energy range, from keV to MeV, establishing their scalability as versatile detectors for rare event and dark matter physics. These findings also inform the optimization of future large mass cryogenic calorimeters to enhance the sensitivity to low-energy phenomena. △ Less

Submitted 4 February, 2026; v1 submitted 29 May, 2025; originally announced May 2025.

The CRAB facility at the TU Wien TRIGA reactor: status and related physics program

Authors: H. Abele, P. Ajello, A. Armatol, B. Arnold, J. Billard, E. Bossio, J. Burkhart, F. Cappella, N. Casali, R. Cerulli, J. Colas, J-P. Crocombette, G. del Castello, M. del Gallo Roccagiovine, S. Dorer, C. Doutre, A. Erhart, S. Fichtinger, M. Friedl, P. Garin, R. Gergen, C. Goupy, D. Hainz, D. Hauff, E. Jericha , et al. (29 additional authors not shown)

Abstract: The CRAB (Calibrated nuclear Recoils for Accurate Bolometry) project aims to precisely characterize the response of cryogenic detectors to sub-keV nuclear recoils of direct interest for coherent neutrino-nucleus scattering and dark matter search experiments. The CRAB method relies on the radiative capture of thermal neutrons in the target detector, resulting in a nuclear recoil with a well-defined… ▽ More The CRAB (Calibrated nuclear Recoils for Accurate Bolometry) project aims to precisely characterize the response of cryogenic detectors to sub-keV nuclear recoils of direct interest for coherent neutrino-nucleus scattering and dark matter search experiments. The CRAB method relies on the radiative capture of thermal neutrons in the target detector, resulting in a nuclear recoil with a well-defined energy. We present a new experimental setup installed at the TRIGA Mark-II reactor at Atominstitut (Vienna), providing a low intensity beam of thermal neutrons sent to the target cryogenic detector mounted inside a wet dilution refrigerator Kelvinox 100. A crown of BaF$_2$ detectors installed outside the dewar enables coincident detection of the high-energy $γ$ escaping the target crystal after neutron capture. After the presentation of all components of the setup we report the analysis of first commissioning data with a CaWO$_4$ detector of the \NUCLEUS experiment. They show stable operation of the cryostat and detectors on a week-scale. Due to an energy resolution currently limited to 20 eV we use neutron beam induced events at high energy, in the 10 to 100 keV range, to demonstrate the excellent agreement between the data and simulation and the accurate understanding of external background. Thanks to these data we also propose an updated decay scheme of the low-lying excited states of $^{187}$W. Finally, we present the first evidence of neutron-capture induced coincidences between $γ$-detectors and a cryogenic detector. These promising results pave the way for an extensive physics program with various detector materials, like CaWO$_4$, Al$_2$O$_3$, Ge and Si. △ Less

Submitted 21 May, 2025; originally announced May 2025.

Comments: 27 pages, 23 figures

The detection of marine microseismic activity with the CUORE tonne-scale cryogenic experiment

Authors: D. Q. Adams, C. Alduino, K. Alfonso, A. Armatol, F. T. Avignone, O. Azzolini, G. Bari, F. Bellini, G. Benato, M. Beretta, M. Biassoni, A. Branca, C. Brofferio, C. Bucci, J. Camilleri, A. Caminata, A. Campani, J. Cao, C. Capelli, S. Capelli, L. Cappelli, L. Cardani, P. Carniti, N. Casali, E. Celi , et al. (104 additional authors not shown)

Abstract: Vibrations from experimental setups and the environment are a persistent source of noise for low-temperature calorimeters searching for rare events, including neutrinoless double beta ($0νββ$) decay or dark matter interactions. Such noise can significantly limit experimental sensitivity to the physics case under investigation. Here we report the first detection of marine microseismic vibrations us… ▽ More Vibrations from experimental setups and the environment are a persistent source of noise for low-temperature calorimeters searching for rare events, including neutrinoless double beta ($0νββ$) decay or dark matter interactions. Such noise can significantly limit experimental sensitivity to the physics case under investigation. Here we report the first detection of marine microseismic vibrations using mK-scale calorimeters. This study employs a multi-device analysis correlating data from CUORE, the leading experiment in the search for $0νββ$ decay with mK-scale calorimeters and the Copernicus Earth Observation program, revealing the seasonal impact of Mediterranean Sea activity on CUORE's energy thresholds, resolution, and sensitivity over four years. The detection of marine microseisms underscores the need to address faint environmental noise in ultra-sensitive experiments. Understanding how such noise couples to the detector and developing mitigation strategies is essential for next-generation experiments. We demonstrate one such strategy: a noise decorrelation algorithm implemented in CUORE using auxiliary sensors, which reduces vibrational noise and improves detector performance. Enhancing sensitivity to $0νββ$ decay and to rare events with low-energy signatures requires identifying unresolved noise sources, advancing noise reduction methods, and improving vibration suppression systems, all of which inform the design of next-generation rare event experiments. △ Less

Submitted 6 May, 2026; v1 submitted 13 May, 2025; originally announced May 2025.

Comments: Published version (open access, CC BY 4.0)

Journal ref: Communications Physics 9, 121 (2026)

Innovating Bolometers' Mounting: A Gravity-Based Approach

Authors: The CUPID Collaboration, K. Alfonso, A. Armatol, C. Augier, F. T. Avignone III, O. Azzolini, A. S. Barabash, G. Bari, A. Barresi, D. Baudin, F. Bellini, G. Benato, L. Benussi, V. Berest, M. Beretta, M. Bettelli, M. Biassoni, J. Billard, F. Boffelli, V. Boldrini, E. D. Brandani, C. Brofferio, C. Bucci, M. Buchynska, J. Camilleri , et al. (168 additional authors not shown)

Abstract: Cryogenic calorimeters, also known as bolometers, are among the leading technologies for searching for rare events. The CUPID experiment is exploiting this technology to deploy a tonne-scale detector to search for neutrinoless double-beta decay of $^{100}$Mo. The CUPID collaboration proposed an innovative approach to assembling bolometers in a stacked configuration, held in position solely by grav… ▽ More Cryogenic calorimeters, also known as bolometers, are among the leading technologies for searching for rare events. The CUPID experiment is exploiting this technology to deploy a tonne-scale detector to search for neutrinoless double-beta decay of $^{100}$Mo. The CUPID collaboration proposed an innovative approach to assembling bolometers in a stacked configuration, held in position solely by gravity. This gravity-based assembly method is unprecedented in the field of bolometers and offers several advantages, including relaxed mechanical tolerances and simplified construction. To assess and optimize its performance, we constructed a medium-scale prototype hosting 28 Li$_2$MoO$_4$ crystals and 30 Ge light detectors, both operated as cryogenic calorimeters at the Laboratori Nazionali del Gran Sasso (Italy). Despite an unexpected excess of noise in the light detectors, the results of this test proved (i) a thermal stability better than $\pm$0.5 mK at 10 mK, (ii) a good energy resolution of Li$_2$MoO$_4$ bolometers, (6.6 $\pm$ 2.2) keV FWHM at 2615 keV, and (iii) a Li$_2$MoO$_4$ light yield measured by the closest light detector of 0.36 keV/MeV, sufficient to guarantee the particle identification requested by CUPID. △ Less

Submitted 6 March, 2025; originally announced March 2025.

CUPID, the CUORE Upgrade with Particle IDentification

Authors: The CUPID Collaboration, K. Alfonso, A. Armatol, C. Augier, F. T. Avignone III, O. Azzolini, A. S. Barabash, G. Bari, A. Barresi, D. Baudin, F. Bellini, G. Benato, L. Benussi, V. Berest, M. Beretta, L. Bergé, M. Bettelli, M. Biassoni, J. Billard, F. Boffelli, V. Boldrini, E. D. Brandani, C. Brofferio, C. Bucci, M. Buchynska , et al. (168 additional authors not shown)

Abstract: CUPID, the CUORE Upgrade with Particle IDentification, is a next-generation experiment to search for neutrinoless double beta decay ($0νββ$) and other rare events using enriched Li$_2$$^{100}$MoO$_4$ scintillating bolometers. It will be hosted by the CUORE cryostat located at the Laboratori Nazionali del Gran Sasso in Italy. The main physics goal of CUPID is to search for $0νββ$\ of $^{100}$Mo wit… ▽ More CUPID, the CUORE Upgrade with Particle IDentification, is a next-generation experiment to search for neutrinoless double beta decay ($0νββ$) and other rare events using enriched Li$_2$$^{100}$MoO$_4$ scintillating bolometers. It will be hosted by the CUORE cryostat located at the Laboratori Nazionali del Gran Sasso in Italy. The main physics goal of CUPID is to search for $0νββ$\ of $^{100}$Mo with a discovery sensitivity covering the full neutrino mass regime in the inverted ordering scenario, as well as the portion of the normal ordering regime with lightest neutrino mass larger than 10 meV. With a conservative background index of 10$^{-4}$ cnts/(keV$\cdot$kg$\cdot$yr), 240 kg isotope mass, 5 keV FWHM energy resolution at 3 MeV and 10 live-years of data taking, CUPID will have a 90\% C.L. half-life exclusion sensitivity of 1.8 $\cdot$ 10$^{27}$ yr, corresponding to an effective Majorana neutrino mass ($m_{ββ}$) sensitivity of 9--15 meV, and a $3σ$ discovery sensitivity of 1 $\cdot$ 10$^{27}$ yr, corresponding to an $m_{ββ}$ range of 12--21 meV. △ Less

Submitted 11 July, 2025; v1 submitted 1 March, 2025; originally announced March 2025.

Comments: Accepted for publication by EPJC; 25 pages, 6 figures, and 2 tables

Journal ref: Eur. Phys. J. C 85, 737 (2025)

BINGO innovative assembly for background reduction in bolometric $0νββ$ experiments

Authors: A. Armatol, C. Augier, I. C. Bandac, D. Baudin, G. Benato, V. Berest, L. Bergé, J. Billard, J. M. Calvo-Mozota, P. Carniti, M. Chapellier, F. A. Danevich, M. De Jesus, T. Dixon, L. Dumoulin, F. Ferri, J. Gascon, A. Giuliani, H. Gomez, C. Gotti, Ph. Gras, M. Gros, A. Juillard, H. Khalife, V. V. Kobychev , et al. (23 additional authors not shown)

Abstract: BINGO is a project aiming to set the grounds for large-scale bolometric neutrinoless double-beta-decay experiments capable of investigating the effective Majorana neutrino mass at a few meV level. It focuses on developing innovative technologies (a detector assembly, cryogenic photodetectors and active veto) to achieve a very low background index, of the order of $10^{-5}$ counts/(keV kg yr) in th… ▽ More BINGO is a project aiming to set the grounds for large-scale bolometric neutrinoless double-beta-decay experiments capable of investigating the effective Majorana neutrino mass at a few meV level. It focuses on developing innovative technologies (a detector assembly, cryogenic photodetectors and active veto) to achieve a very low background index, of the order of $10^{-5}$ counts/(keV kg yr) in the region of interest. The BINGO demonstrator, called MINI-BINGO, is designed to investigate the promising double-beta-decay isotopes $^{100}$Mo and $^{130}$Te and it will be composed of Li$_2$MoO$_4$ and TeO$_2$ crystals coupled to bolometric light detectors and surrounded by a Bi$_4$Ge$_3$O$_{12}$-based veto. This will allow us to reject a significant background in bolometers caused by surface contamination from $α$-active radionuclides by means of light yield selection and to mitigate other sources of background, such as surface contamination from $β$-active radionuclides, external $γ$ radioactivity, and pile-up due to random coincidence of background events. This paper describes an R\&D program towards the BINGO goals, particularly focusing on the development of an innovative assembly designed to reduce the passive materials within the line of sight of the detectors, which is expected to be a dominant source of background in next-generation bolometric experiments. We present the performance of two prototype modules -- housing four cubic (4.5-cm side) Li$_2$MoO$_4$ crystals in total -- operated in the Canfranc underground laboratory in Spain within a facility developed for the CROSS double-beta-decay experiment. △ Less

Submitted 8 July, 2024; v1 submitted 19 February, 2024; originally announced February 2024.

Comments: Submitted to Nucl. Instr. Meth. A; 28 pages, 11 figures, 4 tables

Journal ref: Nucl. Instrum. Methods Phys. Res. A 1096, 169936 (2024)

ZnO-based scintillating bolometers: New prospects to study double beta decay of $^{64}$Zn

Authors: A. Armatol, B. Broerman, L. Dumoulin, A. Giuliani, H. Khalife, M. Laubenstein, P. Loaiza, P. de Marcillac, S. Marnieros, S. S. Nagorny, S. Nisi, C. Nones, E. Olivieri, L. Pagnanini, S. Pirro, D. V. Poda, J. -A. Scarpaci, A. S. Zolotarova

Abstract: The first detailed study on the performance of a ZnO-based cryogenic scintillating bolometer as a detector to search for rare processes in zinc isotopes was performed. A 7.2 g ZnO low-temperature detector, containing more than 80\% of zinc in its mass, exhibits good energy resolution of baseline noise 1.0--2.7 keV FWHM at various working temperatures resulting in a low-energy threshold for the exp… ▽ More The first detailed study on the performance of a ZnO-based cryogenic scintillating bolometer as a detector to search for rare processes in zinc isotopes was performed. A 7.2 g ZnO low-temperature detector, containing more than 80\% of zinc in its mass, exhibits good energy resolution of baseline noise 1.0--2.7 keV FWHM at various working temperatures resulting in a low-energy threshold for the experiment, 2.0--6.0 keV. The light yield for $β$/$γ$ events was measured as 1.5(3) keV/MeV, while it varies for $α$ particles in the range of 0.2--3.0 keV/MeV. The detector demonstrate an effective identification of the $β$/$γ$ events from $α$ events using time-properties of only heat signals. %(namely, Rise time parameter). The radiopurity of the ZnO crystal was evaluated using the Inductively Coupled Plasma Mass Spectrometry, an ultra-low-background High Purity Ge $γ$-spectrometer, and bolometric measurements. Only limits were set at the level of $\mathcal{O}$(1--100) mBq/kg on activities of \Nuc{K}{40}, \Nuc{Cs}{137} and daughter nuclides from the U/Th natural decay chains. The total internal $α$-activity was calculated to be 22(2) mBq/kg, with a major contribution caused by 6(1) mBq/kg of \Nuc{Th}{232} and 12(2) mBq/kg of \Nuc{U}{234}. Limits on double beta decay (DBD) processes in \Nuc{Zn}{64} and \Nuc{Zn}{70} isotopes were set on the level of $\mathcal{O}(10^{17}$--$10^{18})$ yr for various decay modes profiting from 271 h of acquired background data in the above-ground lab. This study shows a good potential for ZnO-based scintillating bolometers to search for DBD processes of Zn isotopes, especially in \Nuc{Zn}{64}, with the most prominent spectral features at $\sim$10--20 keV, like the two neutrino double electron capture. A 10 kg-scale experiment can reach the experimental sensitivity at the level of $\mathcal{O}(10^{24})$ yr. △ Less

Submitted 11 April, 2023; originally announced April 2023.

Comments: Prepared for submission to JINST; 27 pages, 9 figures, and 7 tables

A first test of CUPID prototypal light detectors with NTD-Ge sensors in a pulse-tube cryostat

Authors: CUPID collaboration, K. Alfonso, A. Armatol, C. Augier, F. T. Avignone III, O. Azzolini, M. Balata, A. S. Barabash, G. Bari, A. Barresi, D. Baudin, F. Bellini, G. Benato, V. Berest, M. Beretta, M. Bettelli, M. Biassoni, J. Billard, V. Boldrini, A. Branca, C. Brofferio, C. Bucci, J. Camilleri, A. Campani, C. Capelli , et al. (154 additional authors not shown)

Abstract: CUPID is a next-generation bolometric experiment aiming at searching for neutrinoless double-beta decay with ~250 kg of isotopic mass of $^{100}$Mo. It will operate at $\sim$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… ▽ More CUPID is a next-generation bolometric experiment aiming at searching for neutrinoless double-beta decay with ~250 kg of isotopic mass of $^{100}$Mo. It will operate at $\sim$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 $^{100}$Mo-enriched Li$_2$MoO$_4$ 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 $^{133}$Ba source with one light detector achieving 0.71(5) keV FWHM, which is -- to our knowledge -- the best ever obtained when compared to $γ$ detectors of any technology in this energy range. △ Less

Submitted 10 April, 2023; originally announced April 2023.

Comments: Prepared for submission to JINST; 16 pages, 7 figures, and 1 table

Twelve-crystal prototype of Li$_2$MoO$_4$ scintillating bolometers for CUPID and CROSS experiments

Authors: CUPID, CROSS collaborations, :, K. Alfonso, A. Armatol, C. Augier, F. T. Avignone III, O. Azzolini, M. Balata, I. C. Bandac, A. S. Barabash, G. Bari, A. Barresi, D. Baudin, F. Bellini, G. Benato, V. Berest, M. Beretta, M. Bettelli, M. Biassoni, J. Billard, V. Boldrini, A. Branca, C. Brofferio, C. Bucci , et al. (160 additional authors not shown)

Abstract: 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… ▽ More 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, $μ$Bq/kg, level of the LMO crystals radioactive contamination by $^{228}$Th and $^{226}$Ra. △ Less

Submitted 10 April, 2023; originally announced April 2023.

Comments: Prepared for submission to JINST; 23 pages, 9 figures, and 4 tables

Enhanced light signal for the suppression of pile-up events in Mo-based bolometers for the $0νββ$ decay search

Authors: A. Ahmine, A. Armatol, I. Bandac, L. Bergé, J. M. Calvo-Mozota, P. Carniti, M. Chapellier, T. Dixon, L. Dumoulin, A. Giuliani, Ph. Gras, F. Ferri, L. Imbert, H. Khalife, P. Loaiza, P. de Marcillac, S. Marnieros, C. A. Marrache-Kikuchi, C. Nones, E. Olivieri, A. Ortiz de Solòrzano, G. Pessina, D. V. Poda, Th. Redon, J. A. Scarpaci , et al. (2 additional authors not shown)

Abstract: Random coincidences of events could be one of the main sources of background in the search for neutrino-less double-beta decay of $^{100}$Mo with macro-bolometers, due to their modest time resolution. Scintillating bolometers as those based on Li$_2$MoO$_4$ crystals and employed in the CROSS and CUPID experiments can eventually exploit the coincident fast signal detected in a light detector to red… ▽ More Random coincidences of events could be one of the main sources of background in the search for neutrino-less double-beta decay of $^{100}$Mo with macro-bolometers, due to their modest time resolution. Scintillating bolometers as those based on Li$_2$MoO$_4$ crystals and employed in the CROSS and CUPID experiments can eventually exploit the coincident fast signal detected in a light detector to reduce this background. However, the scintillation provides a modest signal-to-noise ratio, making difficult a pile-up pulse-shape recognition and rejection at timescales shorter than a few ms. Neganov-Trofimov-Luke assisted light detectors (NTL-LDs) offer the possibility to effectively increase the signal-to-noise ratio, preserving a fast time-response, and enhance the capability of pile-up rejection via pulse shape analysis. In this article we present: a) an experimental work performed with a Li$_2$MoO$_4$ scintillating bolometer, studied in the framework of the CROSS experiment, and utilizing a NTL-LD; b) a simulation method to reproduce, synthetically, randomly coincident two-neutrino double-beta decay events; c) a new analysis method based on a pulse-shape discrimination algorithm capable of providing high pile-up rejection efficiencies. We finally show how the NTL-LDs offer a balanced solution between performance and complexity to reach background index $\sim$$10^{-4}$ counts/keV/kg/year with 280~g Li$_2$MoO$_4$ ($^{100}$Mo enriched) bolometers at 3034 keV, the Q-value of the double-beta decay, and target the goal of a next generation experiment like CUPID. △ Less

Submitted 3 April, 2023; v1 submitted 27 February, 2023; originally announced February 2023.

New results about the revolutionary bolometer assembly of BINGO

Authors: A. Armatol

Abstract: Searching for neutrinoless double-beta decay (0$ν$2$β$) is one of the main experimental challenges of modern physics. One experimental technique is given by cryogenic detectors named bolometers that are really promising for this purpose. The current generation tonne-scale experiment CUORE using this technology is putting the best limit on $^{130}$Te 0$ν$2$β$ half-life with TeO$_2$ crystals but its… ▽ More Searching for neutrinoless double-beta decay (0$ν$2$β$) is one of the main experimental challenges of modern physics. One experimental technique is given by cryogenic detectors named bolometers that are really promising for this purpose. The current generation tonne-scale experiment CUORE using this technology is putting the best limit on $^{130}$Te 0$ν$2$β$ half-life with TeO$_2$ crystals but its sensitivity is limited by its background. Therefore, it will be followed by the next generation experiment CUPID (CUORE Upgrade with Particle IDentification) that will study $^{100}$Mo embedded inside Li$_2$MoO$_4$ crystals in order to reduce the $γ$ background. It will also read the scintillation light produced by Li$_2$MoO$_4$ by adding another Ge bolometer acting as a light detector next to the main absorber to reject the $α$ background. Thanks to that, CUPID will reach a sensitivity 2 orders of magnitude higher than CUORE. However, in the case where this is not enough to detect 0$ν$2$β$, BINGO (Bi-Isotope Next Generation 0$ν$2$β$ Observatory) is preparing the next-next generation of bolometric experiments. To improve the 0$ν$2$β$ discovery sensitivity, the goal is to reduce drastically the number of background events in the region of interest and to combine the use of the two previously cited isotopes: $^{130}$Te and $^{100}$Mo. To achieve this goal, BINGO is proposing to implement an active cryogenic veto to suppress the external $γ$ background, to use Neganov-Trofimov-Luke effect to increase light detector sensitivity and to use a revolutionary detector assembly to reduce the total surface radioactivity contribution. In this article, we will focus on the latter and present the latest results obtained with two 45$\times$45$\times$45 mm$^{3}$ Li$_2$MoO$_4$ crystals. △ Less

Submitted 17 January, 2023; originally announced January 2023.

Comments: 4 pages, 2 figures. Contribution to the proceedings of MEDEX'22, Prague, Czech Republic, 13-17 June 2022

First cryogenic tests on BINGO innovations

Authors: A. Armatol, C. Augier, D. Baudin, G. Benato, J. Billard, P. Carniti, M. Chapellier, A. Charrier, F. Danevich, M. De Combarieu, M. De Jesus, L. Dumoulin, F. Ferri, J. Gascon, A. Giuliani, H. Gomez, C. Gotti, Ph. Gras, M. Gros, A. Juillard, H. Khalife, V. V. Kobychev, M. Lefevre, P. Loaiza, S. Marnieros , et al. (11 additional authors not shown)

Abstract: Neutrinoless double-beta decay ($0\nu2β$) is a hypothetical rare nuclear transition. Its observation would provide an important insight about the nature of neutrinos (Dirac or Majorana particle) demonstrating that the lepton number is not conserved. BINGO (Bi-Isotope $0\nu2β$ Next Generation Observatory) aims to set the technological grounds for future bolometric $0\nu2β$ experiments. It is based… ▽ More Neutrinoless double-beta decay ($0\nu2β$) is a hypothetical rare nuclear transition. Its observation would provide an important insight about the nature of neutrinos (Dirac or Majorana particle) demonstrating that the lepton number is not conserved. BINGO (Bi-Isotope $0\nu2β$ Next Generation Observatory) aims to set the technological grounds for future bolometric $0\nu2β$ experiments. It is based on a dual heat-light readout, i.e. a main scintillating absorber embedding the double-beta decay isotope accompanied by a cryogenic light detector. BINGO will study two of the most promising isotopes: $^{100}$Mo embedded in Li$_2$MoO$_4$ (LMO) crystals and $^{130}$Te embedded in TeO$_2$. BINGO technology will reduce dramatically the background in the region of interest, thus boosting the discovery sensitivity of $0\nu2β$. The proposed solutions will have a high impact on next-generation bolometric tonne-scale experiments, like CUPID. In this contribution, we present the results obtained during the first tests performed in the framework of BINGO R&D. △ Less

Submitted 29 April, 2022; originally announced April 2022.

Comments: 4 pages, 2 figures. Contribution to the proceedings of 32nd Rencontres de Blois, Blois, France, 17-22 October 2021

Optimization of the first CUPID detector module

Authors: CUPID collaboration, A. Armatol, C. Augier, F. T. Avignone III, O. Azzolini, M. Balata, K. Ballen, A. S. Barabash, G. Bari, A. Barresi, D. Baudin, F. Bellini, G. Benato, M. Beretta, M. Bettelli, M. Biassoni, J. Billard, V. Boldrini, A. Branca, C. Brofferio, C. Bucci, J. Camilleri, C. Capelli, S. Capelli, L. Cappelli , et al. (153 additional authors not shown)

Abstract: CUPID will be a next generation experiment searching for the neutrinoless double $β$ decay, whose discovery would establish the Majorana nature of the neutrino. Based on the experience achieved with the CUORE experiment, presently taking data at LNGS, CUPID aims to reach a background free environment by means of scintillating Li$_{2}$$^{100}$MoO$_4$ crystals coupled to light detectors. Indeed, the… ▽ More CUPID will be a next generation experiment searching for the neutrinoless double $β$ decay, whose discovery would establish the Majorana nature of the neutrino. Based on the experience achieved with the CUORE experiment, presently taking data at LNGS, CUPID aims to reach a background free environment by means of scintillating Li$_{2}$$^{100}$MoO$_4$ crystals coupled to light detectors. Indeed, the simultaneous heat and light detection allows us to reject the dominant background of $α$ particles, as proven by the CUPID-0 and CUPID-Mo demonstrators. In this work we present the results of the first test of the CUPID baseline module. In particular, we propose a new optimized detector structure and light sensors design to enhance the engineering and the light collection, respectively. We characterized the heat detectors, achieving an energy resolution of (5.9 $\pm$ 0.2) keV FWHM at the $Q$-value of $^{100}$Mo (about 3034 keV). We studied the light collection of the baseline CUPID design with respect to an alternative configuration which features gravity-assisted light detectors' mounting. In both cases we obtained an improvement in the light collection with respect to past measures and we validated the particle identification capability of the detector, which ensures an $α$ particle rejection higher than 99.9%, fully satisfying the requirements for CUPID. △ Less

Submitted 13 February, 2022; originally announced February 2022.

Comments: 10 pages, 5 figures

A CUPID Li$_{2}$$^{100}$MoO$_4$ scintillating bolometer tested in the CROSS underground facility

Authors: The CUPID Interest Group, A. Armatol, E. Armengaud, W. Armstrong, C. Augier, F. T. Avignone III, O. Azzolini, I. C. Bandac, A. S. Barabash, G. Bari, A. Barresi, D. Baudin, F. Bellini, G. Benato, M. Beretta, L. Bergé, Ch. Bourgeois, M. Biassoni, J. Billard, V. Boldrini, A. Branca, C. Brofferio, C. Bucci, J. M. Calvo-Mozota, J. Camilleri , et al. (156 additional authors not shown)

Abstract: A scintillating bolometer based on a large cubic Li$_{2}$$^{100}$MoO$_4$ crystal (45 mm side) and a Ge wafer (scintillation detector) has been operated in the CROSS cryogenic facility at the Canfranc underground laboratory in Spain. The dual-readout detector is a prototype of the technology that will be used in the next-generation $0\nu2β$ experiment CUPID. The measurements were performed at 18 an… ▽ More A scintillating bolometer based on a large cubic Li$_{2}$$^{100}$MoO$_4$ crystal (45 mm side) and a Ge wafer (scintillation detector) has been operated in the CROSS cryogenic facility at the Canfranc underground laboratory in Spain. The dual-readout detector is a prototype of the technology that will be used in the next-generation $0\nu2β$ experiment CUPID. The measurements were performed at 18 and 12 mK temperature in a pulse tube dilution refrigerator. This setup utilizes the same technology as the CUORE cryostat that will host CUPID and so represents an accurate estimation of the expected performance. The Li$_{2}$$^{100}$MoO$_4$ bolometer shows a high energy resolution of 6 keV FWHM at the 2615 keV $γ$ line. The detection of scintillation light for each event triggered by the Li$_{2}$$^{100}$MoO$_4$ bolometer allowed for a full separation ($\sim$8$σ$) between $γ$($β$) and $α$ events above 2 MeV. The Li$_{2}$$^{100}$MoO$_4$ crystal also shows a high internal radiopurity with $^{228}$Th and $^{226}$Ra activities of less than 3 and 8 $μ$Bq/kg, respectively. Taking also into account the advantage of a more compact and massive detector array, which can be made of cubic-shaped crystals (compared to the cylindrical ones), this test demonstrates the great potential of cubic Li$_{2}$$^{100}$MoO$_4$ scintillating bolometers for high-sensitivity searches for the $^{100}$Mo $0\nu2β$ decay in CROSS and CUPID projects. △ Less

Submitted 27 November, 2020; originally announced November 2020.

Comments: 19 pages, 7 figures, 1 table

Characterization of cubic Li$_{2}$$^{100}$MoO$_4$ crystals for the CUPID experiment

Authors: A. Armatol, E. Armengaud, W. Armstrong, C. Augier, F. T. Avignone III, O. Azzolini, A. Barabash, G. Bari, A. Barresi, D. Baudin, F. Bellini, G. Benato, M. Beretta, L. Bergè, M. Biassoni, J. Billard, V. Boldrini, A. Branca, C. Brofferio, C. Bucci, J. Camilleri, S. Capelli, L. Cappelli, L. Cardani, P. Carniti , et al. (147 additional authors not shown)

Abstract: The CUPID Collaboration is designing a tonne-scale, background-free detector to search for double beta decay with sufficient sensitivity to fully explore the parameter space corresponding to the inverted neutrino mass hierarchy scenario. One of the CUPID demonstrators, CUPID-Mo, has proved the potential of enriched Li$_{2}$$^{100}$MoO$_4$ crystals as suitable detectors for neutrinoless double beta… ▽ More The CUPID Collaboration is designing a tonne-scale, background-free detector to search for double beta decay with sufficient sensitivity to fully explore the parameter space corresponding to the inverted neutrino mass hierarchy scenario. One of the CUPID demonstrators, CUPID-Mo, has proved the potential of enriched Li$_{2}$$^{100}$MoO$_4$ crystals as suitable detectors for neutrinoless double beta decay search. In this work, we characterised cubic crystals that, compared to the cylindrical crystals used by CUPID-Mo, are more appealing for the construction of tightly packed arrays. We measured an average energy resolution of (6.7$\pm$0.6) keV FWHM in the region of interest, approaching the CUPID target of 5 keV FWHM. We assessed the identification of $α$ particles with and without a reflecting foil that enhances the scintillation light collection efficiency, proving that the baseline design of CUPID already ensures a complete suppression of this $α$-induced background contribution. We also used the collected data to validate a Monte Carlo simulation modelling the light collection efficiency, which will enable further optimisations of the detector. △ Less

Submitted 27 November, 2020; originally announced November 2020.

Novel technique for the study of pile-up events in cryogenic bolometers

Authors: A. Armatol, E. Armengaud, W. Armstrong, C. Augier, F. T. Avignone III, O. Azzolini, A. Barabash, G. Bari, A. Barresi, D. Baudin, F. Bellini, G. Benato, M. Beretta, L. Bergé, M. Biassoni, J. Billard, V. Boldrini, A. Branca, C. Brofferio, C. Bucci, J. Camilleri, S. Capelli, L. Cappelli, L. Cardani, P. Carniti , et al. (144 additional authors not shown)

Abstract: Precise characterization of detector time resolution is of crucial importance for next-generation cryogenic-bolometer experiments searching for neutrinoless double-beta decay, such as CUPID, in order to reject background due to pile-up of two-neutrino double-beta decay events. In this paper, we describe a technique developed to study the pile-up rejection capability of cryogenic bolometers. Our ap… ▽ More Precise characterization of detector time resolution is of crucial importance for next-generation cryogenic-bolometer experiments searching for neutrinoless double-beta decay, such as CUPID, in order to reject background due to pile-up of two-neutrino double-beta decay events. In this paper, we describe a technique developed to study the pile-up rejection capability of cryogenic bolometers. Our approach, which consists of producing controlled pile-up events with a programmable waveform generator, has the benefit that we can reliably and reproducibly control the time separation and relative energy of the individual components of the generated pile-up events. The resulting data allow us to optimize and benchmark analysis strategies to discriminate between individual and pile-up pulses. We describe a test of this technique performed with a small array of detectors at the Laboratori Nazionali del Gran Sasso, in Italy; we obtain a 90% rejection efficiency against pulser-generated pile-up events with rise time of ~15ms down to time separation between the individual events of about 2ms. △ Less

Submitted 12 July, 2021; v1 submitted 23 November, 2020; originally announced November 2020.

Journal ref: Phys. Rev. C 104, 015501 (2021)