V. Di Felice
A5090562417- Dark Matter and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Ionosphere and magnetosphere dynamics
- Astro and Planetary Science
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
- Geomagnetism and Paleomagnetism Studies
- Advancements in Solid Oxide Fuel Cells
- Nuclear Physics and Applications
- Atmospheric Ozone and Climate
- Fuel Cells and Related Materials
- Gamma-ray bursts and supernovae
- Solar Radiation and Photovoltaics
- Magnetic and transport properties of perovskites and related materials
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Electronic and Structural Properties of Oxides
- Electrocatalysts for Energy Conversion
- Radiation Detection and Scintillator Technologies
- Advanced Battery Materials and Technologies
- Muon and positron interactions and applications
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2016-2025
Agenzia Spaziale Italiana
2014-2024
University of Rome Tor Vergata
2013-2023
Istituto Nazionale di Fisica Nucleare
2013-2023
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2009-2020
University of Hawaii System
2020
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
2017-2019
University of Sassari
2017
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud
2017
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2014-2017
Protons and helium nuclei are the most abundant components of cosmic radiation. Precise measurements their fluxes needed to understand acceleration subsequent propagation rays in our Galaxy. We report precision proton spectra rigidity range 1 gigavolt 1.2 teravolts performed by satellite-borne experiment PAMELA (payload for antimatter matter exploration light-nuclei astrophysics). find that spectral shapes these two species different cannot be described well a single power law. These data...
The satellite-borne experiment PAMELA has been used to make a new measurement of the cosmic-ray antiproton flux and antiproton-to-proton ratio which extends previously published measurements down 60 MeV up 180 GeV in kinetic energy. During 850 days data acquisition approximately 1500 antiprotons were observed. are consistent with purely secondary production Galaxy. More precise models required for complete interpretation results.
Precision measurements of the electron component in cosmic radiation provide important information about origin and propagation rays Galaxy. Here we present new results regarding negatively charged electrons between 1 625 GeV performed by satellite-borne experiment PAMELA. This is first time that cosmic-ray have been identified above 50 GeV. The spectrum can be described with a single power law energy dependence spectral index -3.18 +- 0.05 region influenced solar wind (> 30 GeV). No...
The Alpha Magnetic Spectrometer (AMS) is a precision particle physics detector on the International Space Station (ISS) conducting unique, long-duration mission of fundamental research in space. objectives include precise studies origin dark matter, antimatter, and cosmic rays as well exploration new phenomena. Following 16-year period construction testing, precursor flight Shuttle, AMS was installed ISS May 19, 2011. In this report we present results based 120 billion charged ray events up...
Precision measurements of the positron component in cosmic radiation provide important information about propagation rays and nature particle sources our Galaxy. The satellite-borne experiment PAMELA has been used to make a new measurement cosmic-ray flux fraction that extends previously published up 300 GeV kinetic energy. combined energy spectrum unique tool constrain interpretation models. During recent solar minimum activity period from July 2006 December 2009 approximately 24500...
The energy spectra of galactic cosmic rays carry fundamental information regarding their origin and propagation. These spectra, when measured near Earth, are significantly affected by the solar magnetic field. A comprehensive description radiation must therefore include transport modulation inside heliosphere. During end last decade Sun underwent a peculiarly long quiet phase well suited to study processes. In this paper we present proton from July 2006 December 2009 PAMELA. large collected...
Extended results on the cosmic-ray electron $+$ positron spectrum from 11 GeV to 4.8 TeV are presented based observations with Calorimetric Electron Telescope (CALET) International Space Station utilizing data up November 2017. The analysis uses full detector acceptance at high energies, approximately doubling statistics compared previous result. CALET is an all-calorimetric instrument a total thickness of 30 ${X}_{0}$ normal incidence and fine imaging capability, designed achieve large...
In this paper, we present the analysis and results of a direct measurement cosmic-ray proton spectrum with CALET instrument onboard International Space Station, including detailed assessment systematic uncertainties. The observation period used in is from October 13, 2015 to August 31, 2018 (1054 days). We have achieved very wide energy range necessary carry out measurements 50 GeV 10 TeV covering, for first time space, single whole interval previously investigated most cases separate...
Precision results on cosmic-ray electrons are presented in the energy range from 0.5 GeV to 1.4 TeV based $28.1\ifmmode\times\else\texttimes\fi{}{10}^{6}$ collected by Alpha Magnetic Spectrometer International Space Station. In entire electron and positron spectra have distinctly different magnitudes dependences. The flux exhibits a significant excess starting $42.{1}_{\ensuremath{-}5.2}^{+5.4}\text{ }\text{ }\mathrm{GeV}$ compared lower trends, but nature of this is above...
We present results over an 11-year Solar cycle of cosmic antiprotons based on <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>1.1</a:mn><a:mo>×</a:mo><a:msup><a:mn>10</a:mn><a:mn>6</a:mn></a:msup></a:math> events in the rigidity range from 1.00 to 41.9 GV. The <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mover accent="true"><c:mi>p</c:mi><c:mo stretchy="false">¯</c:mo></c:mover></c:math> fluxes exhibit distinct properties. magnitude...
Precision measurements of the electron component in cosmic radiation provide important information about origin and propagation rays Galaxy not accessible from study cosmic-ray nuclear components due to their differing diffusion energy-loss processes. However, when measured near Earth, effects modulation galactic heliosphere, particularly significant for energies up at least 30 GeV, must be properly taken into account. In this paper (e^-) spectra by PAMELA down 70 MeV July 2006 December 2009...
First results of a cosmic-ray electron and positron spectrum from 10 GeV to 3 TeV is presented based upon observations with the CALET instrument on International Space Station starting in October, 2015. Nearly half million events are included analysis. an all-calorimetric total vertical thickness 30 ${X}_{0}$ fine imaging capability designed achieve large proton rejection excellent energy resolution well into region. The observed over can be fit single power law spectral index...
The propagation of cosmic rays inside our galaxy plays a fundamental role in shaping their injection spectra into those observed at Earth. One the best tools to investigate this issue is ratio fluxes for secondary and primary species. boron-to-carbon (B/C) ratio, particular, sensitive probe mechanisms. This paper presents new measurements absolute boron carbon nuclei, as well B/C from PAMELA space experiment. results span range 0.44 - 129 GeV/n kinetic energy data taken period July 2006 March 2008.
Precise measurements of the time-dependent intensity low energy ($<50$ GeV) galactic cosmic rays are fundamental to test and improve models which describe their propagation inside heliosphere. Especially, data spanning different solar activity periods, i.e. from minimum maximum, needed achieve comprehensive understanding such physical phenomenon. The phase between 23$^{rd}$ 24$^{th}$ cycles was peculiarly long, extending up beginning 2010 followed by maximum phase, reached during early 2014....
We report the observation of new properties primary iron (Fe) cosmic rays in rigidity range 2.65 GV to 3.0 TV with 0.62×106 nuclei collected by Alpha Magnetic Spectrometer experiment on International Space Station. Above 80.5 dependence ray Fe flux is identical He, C, and O fluxes, Fe/O ratio being constant at 0.155±0.006. This shows that unexpectedly belong same class which different from Ne, Mg, Si class.Received 2 October 2020Revised 22 November 2020Accepted 9 December...
We report the observation of new properties primary cosmic rays, neon (Ne), magnesium (Mg), and silicon (Si), measured in rigidity range 2.15 GV to 3.0 TV with 1.8×10^{6} Ne, 2.2×10^{6} Mg, 1.6×10^{6} Si nuclei collected by Alpha Magnetic Spectrometer experiment on International Space Station. The Ne Mg spectra have identical dependence above 3.65 GV. three 86.5 GV, deviate from a single power law 200 harden an way. Unexpectedly, rays is different He, C, O. This shows that O are two classes rays.
We present the precision measurement of daily proton fluxes in cosmic rays from May 20, 2011 to October 29, 2019 (a total 2824 days or 114 Bartels rotations) rigidity interval 1 100 GV based on 5.5×10^{9} protons collected with Alpha Magnetic Spectrometer aboard International Space Station. The exhibit variations multiple timescales. From 2014 2018, we observed recurrent flux a period 27 days. Shorter periods 9 and 13.5 are 2016. strength all three periodicities changes time rigidity....
We present the space spectrometer PAMELA observations of proton and helium fluxes during December 13 14, 2006 solar particle events. This is first direct measurement energetic particles in with a single instrument energy range from $\sim$ 80 MeV/n up to 3 GeV/n. In event measured spectra protons were compared results obtained by neutron monitors other detectors. Our measurements show spectral behaviour different those derived monitor network. No satisfactory analytical fitting was found for...
The last solar minimum activity period, and the consequent modulation conditions for cosmic rays, was unusual. highest levels of Galactic protons were recorded at Earth in late 2009 contrast to expectations. A comprehensive model used study proton period from 2006 order determine what basic processes responsible during this why it differs previous periods. This established is now applied studying electron spectra as observed 80 MeV–30 GeV by PAMELA space detector mid-2006 end 2009. Over...
Cosmic-ray electrons and positrons are a unique probe of the propagation cosmic rays as well nature distribution particle sources in our Galaxy. Recent measurements these particles challenging basic understanding mechanisms production, acceleration, rays. Particularly striking differences between low energy results collected by space-borne PAMELA AMS-02 experiments older pointing to sign-charge dependence solar modulation cosmic-ray spectra. The experiment has been measuring time variation...