G. Consolati
A5002670653- Muon and positron interactions and applications
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Atomic and Molecular Physics
- Neutrino Physics Research
- Graphene research and applications
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Polymer crystallization and properties
- Radio Astronomy Observations and Technology
- Membrane Separation and Gas Transport
- Advancements in Battery Materials
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Ammonia Synthesis and Nitrogen Reduction
- Chemical Synthesis and Characterization
- Recycling and Waste Management Techniques
- Advanced NMR Techniques and Applications
- Gamma-ray bursts and supernovae
- Quantum and Classical Electrodynamics
- Polymer Nanocomposite Synthesis and Irradiation
- Atmospheric Ozone and Climate
- Particle Accelerators and Free-Electron Lasers
Politecnico di Milano
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2016-2025
European Organization for Nuclear Research
2024
Institute of Astronomy and Space Physics
2021-2023
Consejo Nacional de Investigaciones Científicas y Técnicas
2017-2023
Universidad Nacional de La Plata
2017-2023
University of Buenos Aires
2021-2023
Instituto de Tecnologías en Detección y Astropartículas
2021-2023
Pierre Auger Observatory
2021-2023
Institute of Scientific and Technical Research for Defense
2021-2023
Cosmic rays are atomic nuclei arriving from outer space that reach the highest energies observed in nature. Clues to their origin come studying distribution of arrival directions. Using 3 × 104 cosmic with above 8 1018 electron volts, recorded Pierre Auger Observatory a total exposure 76,800 km2 sr year, we determined existence anisotropy The anisotropy, detected at more than 5.2σ level significance, can be described by dipole an amplitude [Formula: see text] percent toward right ascension...
Abstract A new analysis of the data set from Pierre Auger Observatory provides evidence for anisotropy in arrival directions ultra-high-energy cosmic rays on an intermediate angular scale, which is indicative excess arrivals strong, nearby sources. The consist 5514 events above with zenith angles up to 80° recorded before 2017 April 30. Sky models have been created two distinct populations extragalactic gamma-ray emitters: active galactic nuclei second catalog hard Fermi -LAT sources (2FHL)...
Abstract The combined fit of the measured energy spectrum and shower maximum depth distributions ultra-high-energy cosmic rays is known to constrain parameters astrophysical models with homogeneous source distributions. Studies distribution cosmic-ray arrival directions show a better agreement in which fraction flux non-isotropic associated nearby radio galaxy Centaurus A or catalogs such as that starburst galaxies. Here, we present novel combination both analyses by simultaneous directions,...
We report an investigation of the mass composition cosmic rays with energies from 3 to 100 EeV (<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>1</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:mi>EeV</a:mi><a:mo>=</a:mo><a:msup><a:mrow><a:mn>10</a:mn></a:mrow><a:mrow><a:mn>18</a:mn></a:mrow></a:msup><a:mtext> </a:mtext><a:mi>eV</a:mi></a:mrow></a:math>) using distributions depth shower maximum <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
We report a measurement of the energy spectrum cosmic rays above 2.5×1018 eV based on 215 030 events. New results are presented: at about 1.3×1019 eV, spectral index changes from 2.51±0.03(stat)±0.05(syst) to 3.05±0.05(stat)±0.10(syst), evolving 5.1±0.3(stat)±0.1(syst) beyond 5×1019 while no significant dependence features declination is seen in accessible range. These can be reproduced models with energy-dependent mass composition. The density 5×1018 [5.66±0.03(stat)±1.40(syst)]×1053 erg...
We present a measurement of the cosmic-ray spectrum above 100\,PeV using part surface detector Pierre Auger Observatory that has spacing 750~m. An inflection is observed, confirming presence so-called \emph{second-knee} feature. The then combined with 1500\,m array to produce single flux, linking this spectral feature three additional breaks at highest energies. spectrum, an energy scale set calorimetrically via fluorescence telescopes and type, results in most statistically systematically...
A promising energy range to look for angular correlation between cosmic rays of extragalactic origin and their sources is at the highest energies, above few tens EeV ($1\:{\rm EeV}\equiv 10^{18}\:$eV). Despite flux these particles being extremely low, area ${\sim}\:3{,}000 \: \text{km}^2$ covered Pierre Auger Observatory, 17-year data-taking period Phase 1 its operations, have enabled us measure arrival directions more than 2,600 ultra-high $32\:\text{EeV}$. We publish this data set, largest...
Abstract Antihydrogen atoms with K or sub-K temperature are a powerful tool to precisely probe the validity of fundamental physics laws and design highly sensitive experiments needs antihydrogen controllable well defined conditions. We present here experimental results on production in pulsed mode which time when 90% produced is known an uncertainty ~250 ns. The source generated by charge-exchange reaction between Rydberg positronium atoms—produced via injection positron beam into...
We report on laser cooling of a large fraction positronium (Ps) in free flight by strongly saturating the 1^{3}S-2^{3}P transition with broadband, long-pulsed 243 nm alexandrite laser. The ground state Ps cloud is produced magnetic and electric field-free environment. observe two different laser-induced effects. first effect an increase number atoms after time has spent long-lived 2^{3}P states. second one-dimensional Doppler Ps, reducing cloud's temperature from 380(20) to 170(20) K....
We test the predictions of hadronic interaction models regarding depth maximum air-shower profiles, <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:msub><a:mi>X</a:mi><a:mi>max</a:mi></a:msub></a:math>, and ground-particle signals in water-Cherenkov detectors at 1000 m from shower core, <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>S</c:mi><c:mo stretchy="false">(</c:mo><c:mn>1000</c:mn><c:mo stretchy="false">)</c:mo></c:math>, using...
PTMSP membranes were prepared and characterized. The mean molecular weight of the polymer was found to be 450,000 Da. Time dependence density, mechanical properties, IR spectra, DSC, PAL, permeability data are presented. A detailed analysis PAL results for samples under vacuum, in air, oxygen, nitrogen atmosphere is presented with aim investigate influence external on experimental measurements determine correctly size number free volume holes. From all a model channel network proposed large...
The AEGIS experiment, currently being set up at the Antiproton Decelerator CERN, has objective of studying free fall antimatter in Earth's gravitational field by means a pulsed cold atomic beam antihydrogen atoms. Both duration and vertical displacement horizontally emitted atoms will be measured, allowing first test WEP with antimatter.
Abstract The precise measurement of forces is one way to obtain deep insight into the fundamental interactions present in nature. In context neutral antimatter, gravitational interaction high interest, potentially revealing new that violate weak equivalence principle. Here we report on a successful extension tool from atom optics—the moiré deflectometer—for acceleration slow antiprotons. setup consists two identical transmission gratings and spatially resolving emulsion detector for...
We demonstrate the laser excitation of $n=3$ state positronium (Ps) in vacuum. A combination a specially designed pulsed slow positron beam and high-efficiency converter target was used to produce Ps. Its annihilation recorded by single-shot lifetime spectroscopy. Pulsed level at wavelength $\ensuremath{\lambda}\ensuremath{\approx}205$ nm monitored via Ps photoionization induced second intense pulse $\ensuremath{\lambda}=1064$ nm. About 15% overall emitted into vacuum excited photoionized....
We present measurements of the large-scale cosmic-ray anisotropies in right ascension, using data collected by surface detector array Pierre Auger Observatory over more than 14 years. determine equatorial dipole component, $\vec{d}_\perp$, through a Fourier analysis ascension that includes weights for each event so as to account main detector-induced systematic effects. For energies at which trigger efficiency is small, ``East-West'' method employed. Besides from with detectors separated...
Abstract The hybrid design of the Pierre Auger Observatory allows for measurement properties extensive air showers initiated by ultra-high energy cosmic rays with unprecedented precision. By using an array prototype underground muon detectors, we have performed first direct measurement, Collaboration, content between $$2\times 10^{17}$$ <mml:math...
Ultra-high-energy photons with energies exceeding $10^{17}$ eV offer a wealth of connections to different aspects cosmic-ray astrophysics as well gamma-ray and neutrino astronomy. The recent observations in the $10^{15}$ range further motivate searches for even higher-energy photons. In this paper, we present search $2{\times}10^{17}$ using about 5.5 years hybrid data from low-energy extensions Pierre Auger Observatory. upper limits on integral photon flux derived here are most stringent...
The (AERA), part of the Pierre Auger Observatory, is currently largest array radio antenna stations deployed for detection cosmic rays, spanning an area <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>17</a:mn><a:mtext> </a:mtext><a:mtext> </a:mtext><a:msup><a:mrow><a:mi>km</a:mi></a:mrow><a:mn>2</a:mn></a:msup></a:math> with 153 stations. It detects emission extensive air showers produced by rays in 30–80 MHz band. Here, we report AERA measurements (<c:math...
Cosmic rays arriving at Earth collide with the upper parts of atmosphere, thereby inducing extensive air showers. When secondary particles from cascade arrive ground, they are measured by surface detector arrays. We describe methods applied to measurements Pierre Auger Observatory reconstruct events zenith angles less than $60^\circ$ using timing and signal information recorded water-Cherenkov stations. In addition, we assess accuracy these in reconstructing arrival directions primary cosmic...
The atmospheric depth of the air shower maximum $X_{\mathrm{max}}$ is an observable commonly used for determination nuclear mass composition ultra-high energy cosmic rays. Direct measurements are performed using observations longitudinal development with fluorescence telescopes. At same time, several methods have been proposed indirect estimation from characteristics particles registered surface detector arrays. In this paper, we present a deep neural network (DNN) $X_{\mathrm{max}}$....
Abstract Lorentz invariance violation (LIV) is often described by dispersion relations of the form E i 2 = m + p +δ i,n 2+n with delta different based on particle type , energy momentum and rest mass . Kinematics thresholds interactions are modified once LIV terms become comparable to squared masses particles involved. Thus, strongest constraints coefficients δ tend come from highest energies. At sufficiently high energies, photons produced cosmic ray as they propagate through Universe could...
Using the data of Pierre Auger Observatory, we report on a search for signatures that would be suggestive super-heavy particles decaying in Galactic halo. From lack signal, present upper limits different energy thresholds above ≳108 GeV secondary by-product fluxes expected from decay particles. Assuming density these matches dark matter observed today, translate bounds particle into tight constraints couplings governing process as function mass. Instantons, which are nonperturbative...
The origin of ultra-high-energy cosmic rays (UHECRs), particles from outer space with energies~$E \geq 1\;$EeV, is still unknown, though the near-isotropy their arrival direction distribution excludes a dominant Galactic contribution, and interactions background photons prevent them travelling cosmologically large distances. This suggests that sources must be searched for in nearby galaxy groups clusters. Deflections by intergalactic magnetic fields are expected to hinder such searches but...