V. D’Andrea
A5069527749- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Muon and positron interactions and applications
- Quantum Chromodynamics and Particle Interactions
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Scientific Research and Discoveries
- CCD and CMOS Imaging Sensors
- Process Optimization and Integration
- Advancements in PLL and VCO Technologies
- Photocathodes and Microchannel Plates
- Quantum, superfluid, helium dynamics
- Cosmology and Gravitation Theories
- Spacecraft and Cryogenic Technologies
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2016-2025
Gran Sasso Science Institute
2013-2025
University of L'Aquila
2019-2024
University of Zurich
2024
Roma Tre University
2024
Sapienza University of Rome
2021
AlbaNova
2021
Stockholm University
2021
Istituto Nazionale di Fisica Nucleare
2016-2021
Campbell Collaboration
2016-2019
The GERmanium Detector Array (GERDA) experiment searched for the lepton-number-violating neutrinoless double-$\beta$ ($0\nu\beta\beta$) decay of $^{76}$Ge, whose discovery would have far-reaching implications in cosmology and particle physics. By operating bare germanium diodes, enriched an active liquid argon shield, GERDA achieved unprecedently low background index $5.2\times10^{-4}$ counts/(keV$\cdot$kg$\cdot$yr) signal region met design goal to collect exposure 100 kg$\cdot$yr a...
The GERDA experiment searches for the lepton-number-violating neutrinoless double-β decay of ^{76}Ge (^{76}Ge→^{76}Se+2e^{-}) operating bare Ge diodes with an enriched fraction in liquid argon. exposure broad-energy germanium type (BEGe) detectors is increased threefold respect to our previous data release. BEGe feature excellent background suppression from analysis time profile detector signals. In window a level 1.0_{-0.4}^{+0.6}×10^{-3} counts/(keV kg yr) has been achieved; if normalized...
We present the first measurement of nuclear recoils from solar <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mmultiscripts><a:mrow><a:mi mathvariant="normal">B</a:mi></a:mrow><a:mprescripts/><a:none/><a:mrow><a:mn>8</a:mn></a:mrow></a:mmultiscripts></a:mrow></a:math> neutrinos via coherent elastic neutrino-nucleus scattering with XENONnT dark matter experiment. The central detector is a low-background, two-phase time projection chamber 5.9 t sensitive...
A discovery that neutrinos are not the usual Dirac but Majorana fermions, i.e. identical to their antiparticles, would be a manifestation of new physics with profound implications for particle and cosmology. generate neutrinoless double-$\beta$ ($0\nu\beta\beta$) decay, matter-creating process without balancing emission antimatter. So far, 0$\nu\beta\beta$ decay has eluded detection. The GERDA collaboration searches $0\nu\beta\beta$ $^{76}$Ge by operating bare germanium detectors in an...
The multi-staged XENON program at INFN Laboratori Nazionali del Gran Sasso aims to detect dark matter with two-phase liquid xenon time projection chambers of increasing size and sensitivity. XENONnT experiment is the latest detector in program, planned be an upgrade its predecessor XENON1T. It features active target 5.9 tonnes cryogenic (8.5 total mass cryostat). expected extend sensitivity WIMP by more than order magnitude compared XENON1T, thanks larger significantly reduced background,...
A search for neutrinoless $\beta\beta$ decay processes accompanied with Majoron emission has been performed using data collected during Phase I of the GERmanium Detector Array (GERDA) experiment at Laboratori Nazionali del Gran Sasso INFN (Italy). Processes spectral indices n = 1, 2, 3, 7 were searched for. No signals found and lower limits order 10$^{23}$ yr on their half-lives derived, yielding substantially improved results compared to previous experiments $^{76}$Ge. new result half-life...
The GERDA collaboration is performing a sensitive search for neutrinoless double beta decay of $^{76}$Ge at the INFN Laboratori Nazionali del Gran Sasso, Italy. upgrade experiment from Phase I to II has been concluded in December 2015. first data release shows that goal suppress background by one order magnitude compared achieved. thus will remain background-free up its design exposure (100 kg yr). It reach thereby half-life sensitivity more than 10$^{26}$ yr within 3 years collection. This...
The GERmanium Detector Array (Gerda) at the Gran Sasso Underground Laboratory (LNGS) searches for neutrinoless double beta decay ( $$0\nu \beta $$ ) of $$^{76}$$ Ge. Germanium detectors made material with an enriched Ge fraction act simultaneously as sources and this decay. During Phase I theexperiment mainly refurbished semi-coaxial from former experiments were used. For upcoming II, 30 new broad energy germanium (BEGe)-type produced. A subgroup these has already been deployed in Gerda...
The selection of low-radioactive construction materials is the utmost importance for rare-event searches and thus critical to XENONnT experiment. Results an extensive radioassay program are reported, in which material samples have been screened with gamma-ray spectroscopy, mass spectrometry, 222 Rn emanation measurements. Furthermore, cleanliness procedures applied remove or mitigate surface contamination detector described. Screening results, used as inputs a Monte Carlo simulation, predict...
We present the measurement of two-neutrino double-β decay rate 76Ge performed with GERDA Phase II experiment. With a subset entire exposure, 11.8 kg yr, half-life process has been determined: T2ν1/2=(2.022±0.018stat±0.038syst)×1021 yr. This is most precise determination and one measurements process. The relevant nuclear matrix element can be extracted: M2νeff=(0.101±0.001).Received 13 May 2023Accepted 15 August 2023DOI:https://doi.org/10.1103/PhysRevLett.131.142501Published by American...
We search for dark matter (DM) with a mass [3,12] GeV/c^{2} using an exposure of 3.51 tonne year the XENONnT experiment. consider spin-independent DM-nucleon interactions mediated by heavy or light mediator, spin-dependent DM-neutron interactions, momentum-dependent DM scattering, and mirror DM. Using lowered energy threshold compared to previous weakly interacting massive particle search, blind analysis [0.5, 5.0] keV nuclear recoil events reveals no significant signal excess over...
An optimized digital shaping filter has been developed for the Gerda experiment which searches neutrinoless double beta decay in $$^{76}$$ Ge. The Phase I energy calibration data have reprocessed and an average improvement of 0.3 keV resolution (FWHM) corresponding to 10 % at $$Q$$ value $$0\nu \beta $$ Ge is obtained. This possible thanks enhanced low-frequency noise rejection this Zero Area Cusp (ZAC) signal filter.
We present the first search for bosonic superweakly interacting massive particles (super-WIMPs) as keV-scale dark matter candidates performed with GERDA experiment. is a neutrinoless double-β decay experiment which operates high-purity germanium detectors enriched in ^{76}Ge an ultralow background environment at Laboratori Nazionali del Gran Sasso (LNGS) of INFN Italy. Searches were pseudoscalar and vector mass region from 60 keV/c^{2} to 1 MeV/c^{2}. No evidence signal was observed, most...
A bstract The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0 νββ ) decay 76 Ge. technological challenge Gerda to operate in a “background-free” regime region interest (ROI) after analysis cuts full 100 kg · yr target exposure experiment. careful modeling and decomposition full-range energy spectrum essential predict shape composition events ROI around Q ββ 0 search, extract precise measurement...
The GERDA (GERmanium Detector Array) is an experiment for the search of neutrinoless double beta decay (0νββ) in 76Ge, located at Laboratori Nazionali del Gran Sasso INFN (Italy). In first phase experiment, a 90% confidence level (C.L.) sensitivity 2.4⋅1025 yr on 0νββ half-life was achieved with 21.6 kg⋅yr exposure and unprecedented background index region interest 10−2 counts/(keV⋅kg⋅yr). No excess signal events found, experimental lower limit 2.1 ⋅ 1025 (90% C.L.) established....
The GERmanium Detector Array (Gerda) collaboration searched for neutrinoless double- β decay in 76 Ge using isotopically enriched high purity germanium detectors at the Laboratori Nazionali del Gran Sasso of INFN. After Phase I (2011-2013), experiment benefited from several upgrades, including an additional active veto based on LAr instrumentation and a significant increase mass by point-contact that improved half-life sensitivity II (2015-2019) order magnitude. At core background mitigation...
Abstract The ability to detect liquid argon scintillation light from within a densely packed high-purity germanium detector array allowed the Gerda experiment reach an exceptionally low background rate in search for neutrinoless double beta decay of $${}^{76}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>76</mml:mn> </mml:msup> </mml:math> Ge. Proper modeling propagation throughout experimental setup, any origin volume its eventual detection by...
Two neutrino double beta decay of $^{76}$Ge to excited states $^{76}$Se has been studied using data from Phase I the GERDA experiment. An array composed up 14 germanium detectors including that have isotopically enriched in was deployed liquid argon. The analysis various possible transitions final is based on coincidence events between pairs where a de-excitation $\gamma$ ray detected one detector and two electrons other. No signal observed an event counting profile likelihood used determine...
A novel online distillation technique was developed for the XENON1T dark matter experiment to reduce intrinsic background components more volatile than xenon, such as krypton or argon, while detector operating. The method is based on a continuous purification of gaseous volume system using cryogenic column. krypton-in-xenon concentration $(360 \pm 60)$ ppq achieved. It lowest measured in fiducial an operating date. model and fit data describe evolution liquid gas volumes several operation...
The GERmanium Detector Array (GERDA) collaboration searched for neutrinoless double-$\beta$ decay in $^{76}$Ge with an array of about 40 high-purity isotopically-enriched germanium detectors. experimental signature the is a monoenergetic signal at Q$_{\beta\beta}$ = 2039.061(7)keV measured summed energy spectrum two emitted electrons. Both reconstruction and resolution detectors are crucial to separate potential from various backgrounds, such as neutrino-accompanied decays allowed by...
Abstract A search for Beyond the Standard Model double- β decay modes of 76 Ge has been performed with data collected during Phase II GERmanium Detector Array ( Gerda ) experiment, located at Laboratori Nazionali del Gran Sasso INFN (Italy). Improved limits on decays involving Majorons have obtained, compared to previous experiments Ge, half-life values order 10 23 yr. For first time Lorentz invariance violation effects in obtained. The isotropic coefficient å (3) , which embeds decay,...
Neutrinoless double electron capture is a process that, if detected, would give evidence of lepton number violation and the Majorana nature neutrinos. A search for neutrinoless $$^{36}$$ Ar has been performed with germanium detectors installed in liquid argon using data from Phase I GERmanium Detector Array (Gerda) experiment at Gran Sasso Laboratory INFN, Italy. No signal was observed an experimental lower limit on half-life radiative established: $$T_{1/2} > $$ 3.6 $$\times 10 $$^{21}$$...
Abstract The GERmanium Detector Array ( Gerda ) experiment operated enriched high-purity germanium detectors in a liquid argon cryostat, which contains 0.33% of $$^{36}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mn>36</mml:mn> </mml:mmultiscripts> </mml:math> Ar, candidate isotope for the two-neutrino double-electron capture (2 $$\nu $$ <mml:mi>ν</mml:mi> ECEC) and therefore neutrinoless (0 ECEC). If detected, this process would give...
A search for full energy depositions from bosonic keV-scale dark matter candidates of masses between 65 and 1021 keV has been performed with data collected during Phase II the GERmanium Detector Array (Gerda) experiment. Our analysis includes direct absorption as well Compton scattering. With a total exposure 105.5 kg years, no evidence signal above background observed. The resulting exclusion limits deduced either Bayesian or Frequentist statistics are most stringent constraints in major...