M. Esṕırito Santo
A5080568079- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Computational Physics and Python Applications
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Black Holes and Theoretical Physics
- Scientific Research and Discoveries
- Atmospheric Ozone and Climate
- Algorithms and Data Compression
- Cosmology and Gravitation Theories
- Particle Accelerators and Free-Electron Lasers
- History of Science and Medicine
- Photocathodes and Microchannel Plates
- Historical Astronomy and Related Studies
- Atomic and Subatomic Physics Research
- Calibration and Measurement Techniques
- Spacecraft Design and Technology
- Atmospheric aerosols and clouds
- Historical Philosophy and Science
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2003-2020
Pierre Auger Observatory
2007-2016
University of Lisbon
2006-2015
Instituto Politécnico de Lisboa
2008-2014
Iowa State University
2003-2014
Consejo Nacional de Investigaciones Científicas y Técnicas
2009-2012
Institute of Astronomy and Space Physics
2009-2012
University of Buenos Aires
2009-2012
Institute of Scientific and Technical Research for Defense
2012
Instituto
2012
Most QCD models of high energy collisions predict that the inelasticity $K$ is an increasing function energy. We argue that, due to percolation strings, this behaviour will change and, at $\sqrt{s} \simeq 10^4$ GeV, start decrease with This has straightforward consequences in cosmic ray physics: 1) relative depth shower maximum $\bar{X}$ grows faster above knee; 2) measurements ground array experiments GZK energies could be overestimated.
The small angle tile Calorimeter (STIC) provides calorimetric coverage in the very forward region for DELPHI experiment at CERN LEP collider. A veto system composed of two scintillator layers allows one to trigger on single photon events and e-/spl gamma/ separation. We present here some results extensive measurements performed part calorimeter test beams prior installation report performance achieved during 1994 run.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Proceedings of the 12th International Conference on Elastic and Diffractive Scattering (Blois Workshop) - Forward Physics QCD
The trial and condemnation of Giordano Bruno was mainly based on arguments philosophical theological nature, therefore different from Galilei's.Such elements contribute to unfairly devalue the scientific contribution do not properly account in particular for his physics.This paper discusses principle relativity.According common knowledge, special relativity first enunciated 1632 by Galileo Galilei Dialogo sopra i due massimi sistemi del mondo (Dialogue concerning two chief world systems),...
This Conference is the fifth of a series Workshops on High Energy Gamma- ray Experiments, following Conferences held in Perugia 2003, Bari 2004, Cividale del Friuli 2005, Elba Island 2006. year focus was use gamma-ray to study Dark Matter component Universe, origin and propagation Cosmic Rays, Extra Large Spatial Dimensions Tests Lorentz Invariance.
The Pierre Auger Observatory is the largest extensive air shower detector, covering 3000 km2 in Argentina. makes available, for educational and outreach purposes, 1% of its cosmic ray data set, corresponding after 10 years running to more than 35 000 events. Several different proposals activities have been developed within collaboration are available. We will focus on activity guide we with aim exploring rich education potential rays Portuguese high school students. In this use public set as...
The structure of the calorimeters built with "Shashlik" technique allows insertion tracking detectors within sampling structure, in order to improve accuracy determination showering particle direction and enhance e-/spl pi/ separation ability. new luminosity monitor DELPHI detector at LEP was equipped two planes silicon pad placed a depth 4 7.4 radiation lengths. A description is given, together results from exposure test beam.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The GEANT4 Monte Carlo radiation transport toolkit, developed by the RD44 and Collaborations, aims to become a tool of generalized application in high energy physics, nuclear astrophysics, medical physics research. Due its object-oriented design, is distinct new approach for development flexible simulation applications. A wide range coverage both electromagnetic hadronic processes offered. provides also an optical process category, allowing production propagation scintillation Cherenkov...
GAW, acronym for Gamma Air Watch, is a Research and Development experiment in the TeV range, whose main goal to explore feasibility of large field view Imaging Atmospheric Cherenkov Telescopes. GAW an array three relatively small telescopes (2.13 m diameter) which differs from existing presently planned projects two features: adoption refractive optics system as light collector use single photoelectron counting detector working mode. The allows achieve (24x24 squared degrees) suitable...
GAW is a "path-finder" experiment to test the feasibility of new generation Imaging Atmospheric Cherenkov telescopes that join high flux sensitivity with large field view capability using Fresnel lens, stereoscopic observational approach, and single photon counting mode. an array three will be erected at Calar Alto Observatory site (Spain, 2150 m a.s.l.). To evaluate performance GAW, consistent data--set has been simulated, including Crab-like source observation, proper image analysis code...
Recent progress in the field of ultra-high energy cosmic rays has been driven by data collected Pierre Auger Observatory southern hemisphere, and also Telescope Array northern hemisphere. These hybrid observatories combine large ground arrays with fluorescence detection techniques. In this paper, selected results will be reviewed. Future challenges prospects briefly addressed.
Leptoquarks arise naturally in models attempting the unification of quark and lepton sectors standard model particle physics.Such particles could be produced interaction high energy quasi-horizontal cosmic neutrinos with atmosphere, via their direct coupling to a neutrino.The hadronic decay products leptoquark, possibly its leptonic would originate an extensive air shower, observable large ray experiments.In this letter, sensitivity present planned very experiments production leptoquarks...
One of the intents ground-based gamma-ray astronomy is to obtain a sky survey in TeV energy region, and nowadays this target can be reached with giant arrays telescopes, which however need many pointings due their small field view. A different approach on basis GAW, acronym for Gamma Air Watch, an array three relatively Cerenkov telescopes differentiate from existing presently planned two main features: adoption refractive optics system as light collector large view capability, use single...
It is well known that, in nuclear collisions, a sizable fraction of the available energy carried away by baryons. As baryon number conserved, net-baryon $B-\bar{B}$ retains information on energy-momentum incoming nuclei. A simple but consistent model for production high hadron-hadron, hadron-nucleus and nucleus-nucleus collisions presented. The basic ingredients are valence string formation based standard PDFs with QCD evolution fragmentation via Schwinger mechanism. results presented...
The study of Ultra High Energy Cosmic Rays represents one the most challenging topic in and Astroparticle Physics fields. interaction primary particles with atmospheric nuclei produces a huge Extensive Air Shower together isotropic emission UV fluorescence light highly directional Cherenkov photons, that are reflected/diffused isotropically by impact on Earth's surface or high optical depth clouds. For space-based observations, detecting reflected signal delayed coincidence improves accuracy...