A5024359378- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Gamma-ray bursts and supernovae
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Crystallography and Radiation Phenomena
- Nuclear Physics and Applications
- Astrophysical Phenomena and Observations
- Nuclear materials and radiation effects
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Medical Imaging Techniques and Applications
- Solar and Space Plasma Dynamics
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Advanced X-ray Imaging Techniques
- SAS software applications and methods
- Radio Astronomy Observations and Technology
- Muon and positron interactions and applications
- Radiation Therapy and Dosimetry
Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca
2016-2025
University of Insubria
2015-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2017-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2006-2022
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2013-2022
University of Milano-Bicocca
2010-2022
Johannes Gutenberg University Mainz
2017-2022
University of Padua
2017-2022
University of Ferrara
2015-2022
Charles University
2022
<i>Context. <i/> AGILE is an Italian Space Agency mission dedicated to observing the gamma-ray Universe. The AGILE's very innovative instrumentation for first time combines a imager (sensitive in energy range 30 MeV–50 GeV), hard X-ray 18–60 keV), calorimeter 350 keV–100 MeV), and anticoincidence system. was successfully launched on 2007 April 23 from Indian base of Sriharikota inserted equatorial orbit with low particle background.<i>Aims. <i/>AGILE provides crucial data study active...
The well known Crab Nebula is at the center of SN1054 supernova remnant. It consists a rotationally-powered pulsar interacting with surrounding nebula through relativistic particle wind. emissions originating from and have been considered to be essentially stable. Here we report detection strong gamma-ray (100 MeV-10 GeV) flares observed by AGILE satellite in September, 2010 October, 2007. In both cases, unpulsed flux increased factor 3 compared non-flaring flux. flare luminosity short...
The authors evaluated the effect on mammographic examinations of use synchrotron radiation to detect phase-perturbation effects, which are higher than absorption effects for soft tissue in energy range 15–25 keV. Detection was possible because high degree coherence sources. Synchrotron images were obtained a phantom and vitro breast specimens compared with conventional studies. On basis grades assigned by three reviewers, image quality former considerably higher, delivered dose fully compatible.
Phase contrast x-ray imaging is a powerful technique for the detection of low-contrast details in weakly absorbing objects. This method possible relevance field diagnostic radiology. In fact, within soft tissue does not give satisfactory results conventional absorption radiology, mammography being typical example. Nevertheless, up to now all applications phase technique, carried out on thin samples, have required radiation doses substantially higher than those delivered radiological...
We report the detection by Astrorivelatore Gamma a Immagini Leggero (AGILE) satellite of terrestrial gamma ray flashes (TGFs) obtained with minicalorimeter (MCAL) detector operating in energy range 0.3–100 MeV. select events typically lasting few milliseconds spectral and directional selections consistent TGF characteristics previously reported other space missions. During period 1 June 2008 to 31 March 2009 we detect 34 high‐confidence showing millisecond durations geographical distribution...
Recently, new imaging modalities based on the detection of weak phase perturbations effects, among which are contrast and diffraction imaging, have been developed by several researchers. Due to their high sensitivity weakly absorbing details, these techniques seem be very promising for applications in medical field. On other hand, digital radiology is undergoing a wide diffusion, its benefits presently well understood. Up now, however, strong pixel size constraints associated with pattern...
Strong electric discharges associated with thunderstorms can produce terrestrial gamma-ray flashes (TGFs), i.e., intense bursts of x rays and $\ensuremath{\gamma}$ lasting a few milliseconds or less. We present in this Letter new TGF timing spectral data based on the observations Italian Space Agency AGILE satellite. determine that emission above 10 MeV has significant power-law component reaching energies up to 100 MeV. These results challenge theoretical models runaway electron...
The volume reflection phenomenon was detected while investigating 400 GeV proton interactions with bent silicon crystals in the external beam H8 of CERN Super Proton Synchrotron. Such a process observed for wide interval crystal orientations relative to axis, and its efficiency exceeds 95%, thereby surpassing any previously value. These observations suggest new perspectives manipulation high-energy beams, e.g., collimation extraction new-generation hadron colliders, such as Large Hadron...
The Supernova Remnant (SNR) IC 443 is an intermediate-age remnant well known for its radio, optical, X-ray and gamma-ray energy emissions. In this Letter we study the emission above 100 MeV from as obtained by AGILE satellite. A distinct pattern of diffuse in range MeV-3 GeV detected across SNR with prominent maximum (source "A") localized Northeastern shell a flux F = (47 \pm 10) 10^{-8} photons cm^{-2} s^{-1} MeV. This location site strongest shock interaction between blast wave dense...
We present the first catalog of high-confidence <i>γ<i/>-ray sources detected by AGILE satellite during observations performed from July 9, 2007 to June 30, 2008. Cataloged were merging all available data over entire time period. AGILE, launched in April 2007, is an ASI mission devoted 30 MeV–50 GeV energy range, with simultaneous X-ray imaging capability 18–60 keV band. This based on Gamma-Ray Imaging Detector (GRID) for energies greater than 100 MeV. For catalog, we adopted a conservative...
We present optical, X-ray, high energy ($\lessapprox 30$ GeV) and very ($\gtrapprox 100$ GeV; VHE) observations of the high-frequency peaked blazar Mrk 421 taken between 2008 May 24 June 23. A $\gamma$-ray signal was detected by AGILE with \sqrt{TS}=4.5 on 9--15, $F(E>100 \mathrm{MeV})= 42^{+14}_{-12}\times 10^{-8}$ photons cm$^{-2}$ s$^{-1}$. This flaring state is brighter than average flux observed EGRET a factor $\sim$3, but still consistent highest flux. In hard X-rays (20-60 keV)...
We present the results of extensive observations by gamma-ray AGILE satellite Galactic region hosting Carina nebula and remarkable colliding wind binary Eta Carinae (η Car) during period 2007 July–2009 January. detect a source (1AGL J1043−5931) consistent with position η Car. If 1AGL J1043−5931 is associated Car system, our data provide long sought first detection above 100 MeV binary. The average flux integrated over preperiastron July–2008 October Fγ = (37 ± 5) × 10−8 ph cm−2 s−1...
We report on 18 months of multiwavelength observations the blazar 3C 454.3 (Crazy Diamond) carried out in July 2007-January 2009. show results AGILE campaigns which took place May-June 2008, July-August and October 2008-January During May 2009 period, source average flux was highly variable, from an gamma-ray F(E>100MeV) > 200E-8 ph/cm2/s to F(E>100MeV)~80E-8 The spectrum between 100 MeV 1 GeV can be fit by a simple power law (Gamma_GRID ~ 2.0 2.2). Only 3-sigma upper limits derived 20-60...
We report the observation of efficient steering a 855 MeV electron beam at MAMI (MAinzer MIkrotron) facilities by means planar channeling and volume reflection in bent silicon crystal. A 30.5 μm thick plate (211) oriented Si was to cause quasimosaic deformation (111) crystallographic planes, which were used for coherent interaction with beam. The experimental results are analogous those recorded some years ago energy higher than 100 GeV, is only comparable study date. Monte Carlo simulations...
In this paper, we report a Hall mobility of one million in germanium two-dimensional hole gas. The extremely high 1.1 × 106 cm2 V−1 s−1 at carrier sheet density 3 1011 cm−2 was observed 12 K. This is nearly an order magnitude higher than any previously reported. From the structural analysis material and modeling based on relaxation time approximation, attribute result to combination purity Ge channel very low background impurity level that achieved from reduced-pressure chemical vapor...
Supernova remnants (SNRs) are believed to be the main sources of Galactic cosmic rays. Molecular clouds associated with SNRs can produce gamma-ray emission through interaction accelerated particles concentrated gas. The middle aged SNR W28, for its system dense molecular clouds, provides an excellent opportunity test this hypothesis. We present AGILE/GRID observations and compare them at other wavelengths (TeV 12CO J=1-->0 line emission). flux detected by AGILE from dominant source W28 is...
We report on the extreme gamma-ray activity from FSRQ PKS 1510-089 observed by AGILE in March 2009. In same period a radio-to-optical monitoring of source was provided GASP-WEBT and REM. Moreover, several Swift ToO observations were triggered, adding important information behaviour optical/UV to hard X-rays. paid particular attention calibration Swift/UVOT data make it suitable blazars spectra. Simultaneous radio gamma rays allowed us study detail correlation among emission variability at...
The radiation emitted by 855 MeV electrons via planar channeling and volume reflection in a $30.5\text{\ensuremath{-}}\ensuremath{\mu}\mathrm{m}$-thick bent Si crystal has been investigated at the MAMI (Mainzer Mikrotron) accelerator. spectral intensity was much more intense than for an equivalent amorphous material, peaked range case of radiation. Differently from straight crystal, also incidence angle larger Lindhard angle, remains nearly as high channeling. This is due to reflection,...
[Abridged] We report on a multiwavelength observation of the blazar 3C 454.3 (which we dubbed "crazy diamond") carried out November 2007 by means astrophysical satellites AGILE, INTEGRAL, Swift, WEBT Consortium, and optical-NIR telescope REM. is detected at $\sim 19-σ$ level during 3-week observing period, with an average flux above 100 MeV $F_{\rm E>100MeV} = (170 \pm 13) \times 10^{-8}$ \phcmsec. The gamma-ray spectrum can be fit single power-law photon index $Γ_{\rm GRID} 1.73 0.16$...
We report the first blazar detection by AGILE. AGILE detected 3C 454.3 during a period of strongly enhanced optical emission in 2007 July. observed source with dedicated repointing July 24-30 its two co-aligned imagers, Gamma-Ray Imaging Detector and hard X-ray imager Super-AGILE sensitive 30 MeV to 50 GeV 18-60 keV ranges, respectively. Over entire period, γ-ray from at significance level 13.8 σ an average flux (E > 100 MeV) (280 ± 40) × 10-8 photons cm-2 s-1. The appears be variable toward...