V. C. Antochi
A5027898581- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- CCD and CMOS Imaging Sensors
- Advanced MEMS and NEMS Technologies
- Superconducting Materials and Applications
- Mechanical and Optical Resonators
- Quantum Chromodynamics and Particle Interactions
- Photonic and Optical Devices
- Nuclear reactor physics and engineering
- Photocathodes and Microchannel Plates
- Process Optimization and Integration
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Gaussian Processes and Bayesian Inference
AlbaNova
2019-2024
Stockholm University
2019-2024
University of Zurich
2023
Xenon Pharmaceuticals (Canada)
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2023
Sapienza University of Rome
2017-2021
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2018
We report results from searches for new physics with low-energy electronic recoil data recorded the XENON1T detector. With an exposure of 0.65 tonne-years and unprecedentedly low background rate 76±2stat events/(tonne×year×keV) between 1 30 keV, enable one most sensitive solar axions, enhanced neutrino magnetic moment using neutrinos, bosonic dark matter. An excess over known backgrounds is observed at energies prominent 2 3 keV. The axion model has a 3.4σ significance, three-dimensional 90%...
We report constraints on light dark matter (DM) models using ionization signals in the XENON1T experiment. mitigate backgrounds with strong event selections, rather than requiring a scintillation signal, leaving an effective exposure of (22±3) tonne day. Above ∼0.4 keV_{ee}, we observe <1 event/(tonne day keV_{ee}), which is more 1000 times lower similar searches other detectors. Despite observing higher rate at energies, no DM or CEvNS detection may be claimed because cannot model all our...
XENONnT is a dark matter direct detection experiment, utilizing 5.9 t of instrumented liquid xenon, located at the INFN Laboratori Nazionali del Gran Sasso. In this work, we predict experimental background and project sensitivity to weakly interacting massive particles (WIMPs). The expected average differential rate in energy region interest, corresponding (1, 13) keV (4, 50) for electronic nuclear recoils, amounts $12.3 \pm 0.6$ (keV y)$^{-1}$ $(2.2\pm 0.5)\times 10^{-3}$ y)$^{-1}$,...
We report on the first search for nuclear recoils from dark matter in form of weakly interacting massive particles (WIMPs) with XENONnT experiment, which is based a two-phase time projection chamber sensitive liquid xenon mass 5.9 ton. During (1.09±0.03) ton yr exposure used this search, intrinsic ^{85}Kr and ^{222}Rn concentrations target are reduced to unprecedentedly low levels, giving an electronic recoil background rate (15.8±1.3) events/ton keV region interest. A blind analysis events...
We report the first experimental results on spin-dependent elastic weakly interacting massive particle (WIMP) nucleon scattering from XENON1T dark matter search experiment. The analysis uses full ton year exposure of to constrain proton-only and neutron-only cases. No significant signal excess is observed, a profile likelihood ratio used set exclusion limits WIMP-nucleon interactions. This includes most stringent constraint date WIMP-neutron cross section, with minimum 6.3×10^{-42} cm^{2} at...
Direct dark matter detection experiments based on a liquid xenon target are leading the search for particles with masses above $\sim$ 5 GeV/c$^2$, but have limited sensitivity to lighter because of small momentum transfer in matter-nucleus elastic scattering. However, there is an irreducible contribution from inelastic processes accompanying scattering, which leads excitation and ionization recoiling atom (the Migdal effect) or emission Bremsstrahlung photon. In this letter, we report probe...
The nature of dark matter and properties neutrinos are among the most pressing issues in contemporary particle physics. dual-phase xenon time-projection chamber is leading technology to cover available parameter space for Weakly Interacting Massive Particles (WIMPs), while featuring extensive sensitivity many alternative candidates. These detectors can also study through neutrinoless double-beta decay a variety astrophysical sources. A next-generation xenon-based detector will therefore be...
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,...
The XENON1T experiment searches for dark matter particles through their scattering off xenon atoms in a 2 tonne liquid target. detector is dual-phase time projection chamber, which measures simultaneously the scintillation and ionization signals produced by interactions target volume, to reconstruct energy position, as well type of interaction. background rate central volume lowest achieved so far with xenon-based direct detection experiment. In this work we describe response model detector,...
Abstract Xenon dual-phase time projection chambers designed to search for weakly interacting massive particles have so far shown a relative energy resolution which degrades with above $$\sim $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mo>∼</mml:mo></mml:math> 200 keV due the saturation effects. This has limited their sensitivity in rare events like neutrinoless double-beta decay of $$^{136} \hbox {Xe}$$...
The XENON1T experiment at the Laboratori Nazionali del Gran Sasso is most sensitive direct detection for dark matter in form of weakly interacting particles (WIMPs) with masses above $6\text{ }\text{ }\mathrm{GeV}/{c}^{2}$ scattering off nuclei. detector employs a dual-phase time projection chamber 2.0 metric tons liquid xenon target. A one $\text{metric}\text{ }\text{ton}\ifmmode\times\else\texttimes\fi{}\mathrm{year}$ exposure science data was collected between October 2016 and February...
We present results on the search for double-electron capture ($2\nu\text{ECEC}$) of $^{124}$Xe and neutrinoless double-$\beta$ decay ($0\nu\beta\beta$) $^{136}$Xe in XENON1T. consider captures from K- up to N-shell $2\nu\text{ECEC}$ signal model measure a total half-life $T_{1/2}^{2\nu\text{ECEC}}=(1.1\pm0.2_\text{stat}\pm0.1_\text{sys})\times 10^{22}\;\text{yr}$ with $0.87\;\text{kg}\times\text{yr}$ isotope exposure. The statistical significance is $7.0\,\sigma$. use XENON1T data...
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...
Abstract We detail the sensitivity of proposed liquid xenon DARWIN observatory to solar neutrinos via elastic electron scattering. find that will have potential measure fluxes five neutrino components: pp , $$^7$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mrow /> <mml:mn>7</mml:mn> </mml:msup> </mml:math> Be, $$^{13}$$ <mml:mn>13</mml:mn> N, $$^{15}$$ <mml:mn>15</mml:mn> O and pep . The precision components is hindered by double-beta decay $$^{136}$$...
The selection of low-radioactive construction materials is utmost importance for the success low-energy rare event search experiments. Besides radioactive contaminants in bulk, emanation radon atoms from material surfaces attains increasing relevance effort to further reduce background such In this work, we present 222 Rn measurements performed XENON1T dark matter experiment. Together with bulk impurity screening campaign, results enabled us select radio-purest materials, targeting a...
We present first results on the scalar coupling of weakly interacting massive particles (WIMPs) to pions from 1 t yr exposure with XENON1T experiment. This interaction is generated when WIMP couples a virtual pion exchanged between nucleons in nucleus. In contrast most nonrelativistic operators, these pion-exchange currents can be coherently enhanced by total number and therefore may dominate scenarios where spin-independent WIMP-nucleon interactions are suppressed. Moreover, for natural...
Photomultiplier tubes (PMTs) are often used in low-background particle physics experiments, which rely on an excellent response to single-photon signals and stable long-term operation. In particular, the Hamamatsu R11410 model is light sensor of choice for liquid xenon dark matter including XENONnT. The same PMT was also predecessor, XENON1T, where issues affecting its operation were observed. Here, we report improved testing procedure ensures optimal performance Using both new upgraded...
Multiple viable theoretical models predict heavy dark matter particles with a mass close to the Planck mass, range relatively unexplored by current experimental measurements. We use 219.4 days of data collected XENON1T experiment conduct blind search for signals from multiply interacting massive (MIMPs). Their unique track signature allows targeted analysis only 0.05 expected background events muons. Following unblinding, we observe no signal candidate events. This Letter places strong...
Optical readout of GEM based devices by means high granularity and low noise CMOS sensors allows to obtain very interesting tracking performance. Space resolution the order tens μm were measured on plane along with an energy 20%÷30%. The main limitation is represented their poor information about time structure event. In this paper, use a concurrent light suitable photomultiplier acquisition electric signal induced electrode are exploited provide necessary timing informations. analysis PMT...
Abstract The XENONnT detector uses the latest and largest liquid xenon-based time projection chamber (TPC) operated by XENON Collaboration, aimed at detecting Weakly Interacting Massive Particles conducting other rare event searches. data acquisition (DAQ) system constitutes an upgraded expanded version of XENON1T DAQ system. For its operation, it relies predominantly on commercially available hardware accompanied open-source custom-developed software. three constituent subsystems detector,...
We developed a detector signal characterization model based on Bayesian network trained the waveform attributes generated by dual-phase xenon time projection chamber. By performing inference model, we produced quantitative metric of and demonstrate that this can be used to determine whether is sourced from scintillation or an ionization process. describe method its performance electronic-recoil (ER) data taken during first science run XENONnT dark matter experiment. use in waveform-based...
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...
A low-energy electronic recoil calibration of XENON1T, a dual-phase xenon time projection chamber, with an internal $^{37}$Ar source was performed. This features 35-day half-life and provides two mono-energetic lines at 2.82 keV 0.27 keV. The photon yield electron are measured to be (32.3$\pm$0.3) photons/keV (40.6$\pm$0.5) electrons/keV, respectively, in agreement other measurements NEST predictions. is also it (68.0$^{+6.3}_{-3.7}$) electrons/keV. confirms that the detector well-understood...