Fabio Valerio Massoli
A5017199746- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Face recognition and analysis
- Neutrino Physics Research
- Cosmology and Gravitation Theories
- Millimeter-Wave Propagation and Modeling
- Face and Expression Recognition
- Emotion and Mood Recognition
- Quantum Computing Algorithms and Architecture
- Anomaly Detection Techniques and Applications
- Adversarial Robustness in Machine Learning
- Advanced Image and Video Retrieval Techniques
- Biometric Identification and Security
- Microwave Engineering and Waveguides
- Video Surveillance and Tracking Methods
- Quantum Information and Cryptography
- Neural Networks and Reservoir Computing
- Human Pose and Action Recognition
- Speech Recognition and Synthesis
- Telecommunications and Broadcasting Technologies
- Digital Transformation in Industry
- Advanced Neural Network Applications
- Speech and Audio Processing
Istituto di Scienza e Tecnologie dell'Informazione "Alessandro Faedo"
2019-2022
National Research Council
2019-2021
University of Bologna
2012-2018
Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
2012-2018
We report on a search for particle dark matter with the XENON100 experiment, operated at Laboratori Nazionali del Gran Sasso 13 months during 2011 and 2012. features an ultralow electromagnetic background of (5.3 ± 0.6) × 10(-3) events/(keV(ee) kg day) in energy region interest. A blind analysis 224.6 live days 34 exposure has yielded no evidence interactions. The two candidate events observed predefined nuclear recoil range 6.6-30.5 keV(nr) are consistent expectation (1.0 0.2) events....
We report the first dark matter search results from XENON1T, a ∼2000-kg-target-mass dual-phase (liquid-gas) xenon time projection chamber in operation at Laboratori Nazionali del Gran Sasso Italy and ton-scale detector of this kind. The blinded used 34.2 live days data acquired between November 2016 January 2017. Inside (1042±12)-kg fiducial mass [5,40] keV_{nr} energy range interest for weakly interacting massive particle (WIMP) searches, electronic recoil background was (1.93±0.25)×10^{-4}...
DARk matter WImp search with liquid xenoN (DARWIN) will be an experiment for the direct detection of dark using a multi-ton xenon time projection chamber at its core. Its primary goal to explore experimentally accessible parameter space Weakly Interacting Massive Particles (WIMPs) in wide mass-range, until neutrino interactions target become irreducible background. The prompt scintillation light and charge signals induced by particle observed VUV sensitive, ultra-low background photosensors....
The XENON1T experiment is currently in the commissioning phase at Laboratori Nazionali del Gran Sasso, Italy. In this article we study experiment's expected sensitivity to spin-independent WIMP-nucleon interaction cross section, based on Monte Carlo predictions of electronic and nuclear recoil backgrounds. total background $1$ tonne fiducial volume ($1$, $12$) keV equivalent energy region, before applying any selection discriminate between recoils, $(1.80 \pm 0.15) \cdot 10^{-4}$ ($\rm{kg}...
We present new experimental constraints on the elastic, spin-dependent WIMP-nucleon cross section using recent data from XENON100 experiment, operated in Laboratori Nazionali del Gran Sasso Italy. An analysis of 224.6 live days×34 kg exposure acquired during 2011 and 2012 revealed no excess signal due to axial-vector WIMP interactions with 129Xe 131Xe nuclei. This leads most stringent upper limits WIMP-neutron sections for masses above 6 GeV/c², a minimum 3.5×10(-40) cm² at mass 45 90%...
The XENON1T experiment at the Laboratori Nazionali del Gran Sasso (LNGS) is first WIMP dark matter detector operating with a liquid xenon target mass above ton-scale. Out of its 3.2t inventory, 2.0t constitute active dual-phase time projection chamber. scintillation and ionization signals from particle interactions are detected low-background photomultipliers. This article describes instrument subsystems as well strategies to achieve an unprecedented low background level. First results on...
We present the first results of searches for axions and axion-like-particles with XENON100 experiment. The axion-electron coupling constant, $g_{Ae}$, has been probed by exploiting axio-electric effect in liquid xenon. A profile likelihood analysis 224.6 live days $\times$ 34 kg exposure shown no evidence a signal. By rejecting larger than $7.7 \times 10^{-12}$ (90\% CL) solar axion search, we set best limit to date on this coupling. In frame DFSZ KSVZ models, exclude QCD heavier 0.3...
We report on WIMP search results of the XENON100 experiment, combining three runs summing up to 477 live days from January 2010 2014. Data first two were already published. A blind analysis was applied last run recorded between April 2013 and 2014 prior results. The ultra-low electromagnetic background ~$5 \times 10^{-3}$ events/(keV$_{\mathrm{ee}}\times$kg$\times$day) before electronic recoil rejection, together with increased exposure 48 kg $\times$ yr improves sensitivity. profile...
We perform a low-mass dark matter search using an exposure of $30\text{ }\text{ }\mathrm{kg}\ifmmode\times\else\texttimes\fi{}\mathrm{yr}$ with the XENON100 detector. By dropping requirement scintillation signal and only ionization to determine interaction energy, we lowered energy threshold for detection 0.7 keV nuclear recoils. No can be claimed because complete background model cannot constructed without primary signal. Instead, compute upper limit on WIMP-nucleon scattering cross section...
The low-background, VUV-sensitive 3-inch diameter photomultiplier tube R11410 has been developed by Hamamatsu for dark matter direct detection experiments using liquid xenon as the target material. We present results from joint effort between XENON collaboration and company to produce a highly radio-pure photosensor (version R11410-21) XENON1T experiment. After introducing its components, we show methods of radioactive contamination measurements individual materials employed in production....
XENON is a dark matter direct detection project, consisting of time projection chamber (TPC) filled with liquid xenon as medium. The construction the next generation detector, XENON1T, presently taking place at Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It aims sensitivity to spin-independent cross sections 2 · 10-47 c for WIMP masses around 50 GeV2, which requires background reduction by two orders magnitude compared XENON100, current detector. An active system that able tag muons...
We report on a search for electronic recoil event rate modulation signatures in the XENON100 data accumulated over period of 4 years, from January 2010 to 2014. A profile likelihood method, which incorporates stability detector and known background model, is used quantify significance periodicity time distribution events. There weak signature at $431^{+16}_{-14}$ days low energy region $(2.0-5.8)$ keV single scatter sample, with global $1.9\,\sigma$, however no other more significant...
Anomalies are ubiquitous in all scientific fields and can express an unexpected event due to incomplete knowledge about the data distribution or unknown process that suddenly comes into play distorts observations. Usually, such events' rarity, train deep learning (DL) models on anomaly detection (AD) task, scientists only rely "normal" data, i.e., nonanomalous samples. Thus, letting neural network infer beneath input data. In a context, we propose novel framework, named multilayer one-class...
Results from the nuclear recoil calibration of XENON100 dark matter detector installed underground at Laboratori Nazionali del Gran Sasso (LNGS), Italy are presented. Data measurements with an external 241AmBe neutron source compared a detailed Monte Carlo simulation which is used to extract energy dependent charge-yield Qy and relative scintillation efficiency Leff. A very good level absolute spectral matching achieved in both observable signal channels - S1 ionization S2 along agreement...
Laboratory experiments searching for galactic dark matter particles scattering off nuclei have so far not been able to establish a discovery. We use data from the XENON100 experiment search interacting with electrons. With no evidence signal above low background of our experiment, we exclude variety representative models that would induce electronic recoils. For axial-vector couplings electrons, cross-sections 6x10^(-35) cm^2 particle masses m_chi = 2 GeV/c^2. Independent halo, leptophilic...
The XENON100 dark matter experiment uses liquid xenon in a time projection chamber (TPC) to measure nuclear recoils resulting from the scattering of weakly interacting massive particles (WIMPs). In this paper, we report observation single-electron charge signals which are not related WIMP interactions. These signals, show excellent sensitivity detector small explained as being due photoionization impurities and metal components inside TPC. They used unique calibration source characterize...
We present the first constraints on spin-dependent, inelastic scattering cross section of weakly interacting massive particles (WIMPs) nucleons from XENON100 data with an exposure $7.64\ifmmode\times\else\texttimes\fi{}{10}^{3}\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\text{days}$. is a dual-phase xenon time projection chamber 62 kg active mass, operated at Laboratori Nazionali del Gran Sasso (LNGS) in Italy and designed to search for nuclear recoils WIMP-nucleus...
The XENON1T dark matter experiment aims to detect Weakly Interacting Massive Particles (WIMPs) through low-energy interactions with xenon atoms. To such a rare event necessitates the use of radiopure materials minimize number background events within expected WIMP signal region. In this paper we report results an extensive material radioassay campaign for experiment. Using gamma-ray spectroscopy and mass spectrometry techniques, systematic measurements trace radioactive impurities in over...
We report on weakly interacting massive particles (WIMPs) search results in the XENON100 detector using a nonrelativistic effective field theory approach. The data from science run II ($34\text{ }\text{ }\mathrm{kg}\ifmmode\times\else\texttimes\fi{}224.6$ live days) were reanalyzed, with an increased recoil energy interval compared to previous analyses, ranging $(6.6--240)\text{ }{\mathrm{keV}}_{\mathrm{nr}}$. are found be compatible background-only hypothesis. present 90% confidence level...
The XENON1T experiment aims for the direct detection of dark matter in a detector filled with 3.3 tons liquid xenon. In order to achieve desired sensitivity, background induced by radioactive decays inside has be sufficiently low. One major contributor is $$\beta $$ -emitter $$^{85}$$ Kr which present For concentration natural krypton xenon $$\mathrm {^{nat}\mathrm{Kr/Xe}\,<\,200\,ppq}$$ (parts per quadrillion, $$1~\mathrm{ppq}~=10^{-15} \mathrm{mol/mol}$$ ) required. this work, design,...
We have searched for periodic variations of the electronic recoil event rate in (2-6) keV energy range recorded between February 2011 and March 2012 with XENON100 detector, adding up to 224.6 live days total. Following a detailed study establish stability detector its background contributions during this run, we performed an unbinned profile likelihood analysis identify any periodicity 500 days. find global significance less than 1σ all periods, suggesting no statistically significant...