G. Barreira

ORCID: 0000-0001-6373-9441
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About
Contact & Profiles
Research Areas
  • Particle physics theoretical and experimental studies
  • Dark Matter and Cosmic Phenomena
  • Particle Detector Development and Performance
  • High-Energy Particle Collisions Research
  • Atomic and Subatomic Physics Research
  • Radiation Detection and Scintillator Technologies
  • Quantum Chromodynamics and Particle Interactions
  • Solar and Space Plasma Dynamics
  • Neutrino Physics Research
  • Geomagnetism and Paleomagnetism Studies
  • Ionosphere and magnetosphere dynamics
  • Distributed and Parallel Computing Systems
  • Astro and Planetary Science
  • Nuclear Physics and Applications
  • Astrophysics and Cosmic Phenomena
  • Atmospheric Ozone and Climate
  • Simulation Techniques and Applications
  • Spectroscopy and Laser Applications
  • Nuclear reactor physics and engineering
  • Nuclear physics research studies
  • Geophysics and Gravity Measurements
  • Muon and positron interactions and applications
  • Optical Polarization and Ellipsometry
  • CCD and CMOS Imaging Sensors
  • X-ray Spectroscopy and Fluorescence Analysis

LIP - Laboratory of Instrumentation and Experimental Particle Physics
1999-2011

Instituto de Engenharia de Sistemas e Computadores Investigação e Desenvolvimento
1995-2006

European Organization for Nuclear Research
1990-2005

Centre de Gestion Scientifique
2002

Université Paris-Sud
1989-1990

Université Paris Cité
1989-1990

University of Lisbon
1989

A measurement of the cosmic ray positron fraction e+/(e++e−) in energy range 1–30 GeV is presented. The based on data taken by AMS-01 experiment during its 10 day Space Shuttle flight June 1998. proton background suppression order 106 reached identifying converted bremsstrahlung photons emitted from positrons.

10.1016/j.physletb.2007.01.024 article EN cc-by Physics Letters B 2007-02-02

Measurement of the chemical and isotopic composition cosmic rays is essential for precise understanding their propagation in galaxy. While model parameters are mainly determined using B/C ratio, study extended sets ratios can provide stronger constraints on models. In this paper, relative abundances light-nuclei lithium, beryllium, boron, carbon presented. The secondary-to-primary Li/C, Be/C, have been measured kinetic energy range 0.35–45 GeV nucleon−1. ratio 7Li/6Li also magnetic rigidity...

10.1088/0004-637x/724/1/329 article EN The Astrophysical Journal 2010-11-02

The variety of isotopes in cosmic rays allows us to study different aspects the processes that undergo between time they are produced and their arrival heliosphere. In this paper, we present measurements isotopic ratios 2H/4He, 3He/4He, 6Li/7Li, 7Be/(9Be+10Be), 10B/11B range 0.2–1.4 GeV kinetic energy per nucleon. based on data collected by Alpha Magnetic Spectrometer, AMS-01, during STS-91 flight 1998 June.

10.1088/0004-637x/736/2/105 article EN The Astrophysical Journal 2011-07-13

10.1016/s0168-9002(99)01020-7 article EN Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 2000-03-01

10.1016/s0168-9002(97)00331-8 article EN Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 1997-03-01

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"...

10.1109/23.467925 article EN IEEE Transactions on Nuclear Science 1995-08-01

Abstract An absolute quantitative analytical method without external standards has been developed for thick sample analysis by XRF and PIXE applied to bronze brass alloys. Comparisons between the results obtained chemical were made detection limits determined elements evaluated. In an Appendix a rapid calculation of efficiency Ge(Hp) detector is presented.

10.1002/xrs.1300180406 article EN X-Ray Spectrometry 1989-08-01
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