A. Pereira
A5047936607- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- High-Energy Particle Collisions Research
- Astrophysics and Cosmic Phenomena
- Respiratory Support and Mechanisms
- Medical Imaging Techniques and Applications
- Nuclear Physics and Applications
- CCD and CMOS Imaging Sensors
- Quantum, superfluid, helium dynamics
- Neutrino Physics Research
- Cardiac Arrest and Resuscitation
- Neuroscience of respiration and sleep
- Muon and positron interactions and applications
- Radiation Therapy and Dosimetry
- Quantum Chromodynamics and Particle Interactions
- Atmospheric Ozone and Climate
- Advanced Radiotherapy Techniques
- COVID-19 diagnosis using AI
- Endometrial and Cervical Cancer Treatments
- Planetary Science and Exploration
- Underwater Vehicles and Communication Systems
- AI-based Problem Solving and Planning
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2012-2023
University of Coimbra
2005-2023
University of Lisbon
2017
Universidade de São Paulo
2017
Universidade Estadual de Campinas (UNICAMP)
2017
IPO Porto
2017
Universidade Federal de São Carlos
2017
Centro Brasileiro de Pesquisas Físicas
2017
University of Southern California
2011
Eindhoven University of Technology
2005
A motivação e o engajamento dos estudantes desempenham um papel fundamental no sucesso educacional, impactando diretamente a aprendizagem retenção do conhecimento. escolha deste tema justifica-se pela crescente necessidade de encontrar estratégias eficazes que atendam à diversidade perfis alunos. O objetivo principal estudo é investigar como ambientes estimulantes metodologias interativas podem aumentar estudantil. metodologia empregada consiste em uma abordagem bibliográfica, examina...
Gaseous and liquid xenon particle detectors are being used in a number of applications including dark matter search neutrino-less double beta decay experiments. Polytetrafluoroethylene (PTFE) is often these both as electrical insulator light reflector to improve the efficiency detection scintillation photons. However, emits vacuum ultraviolet (VUV) wavelength region (λ≃175 nm) where reflecting properties PTFE not sufficiently known. In this work, we report on measurements reflectance, its...
In the framework of Pierre Auger Observatory upgrade, Resistive Plate Chambers (RPCs) have been proposed as a dedicated detector to better estimate muonic component Extensive Air Showers (EAS), further constraining nature cosmic rays and hadronic interactions that take place in development. RPCs are very interesting option fulfill requirements: cover large areas at low cost; particle counting from one thousands particles; few ns time resolution outdoor standalone operation with maintenance....
In the last two decades Resistive Plate Chambers were employed in Cosmic Ray Experiments COVER-PLASTEX and ARGO/YBJ. both experiments detectors housed indoors, likely owing to gas distribution requirements need control environment variables that directly affect RPCs operational stability. But where Extended Air Shower (EAS) sampling is necessary, large area arrays composed by dispersed stations are deployed, rendering this kind of approach impossible. situation, it would be mandatory have...
A new concept for the direct measurement of muons in air showers is presented. The based on resistive plate chambers (RPCs), which can directly measure with very good space and time resolution. muon detector shielded by placing it under another able to absorb electromagnetic component such as a water-Cherenkov detector, commonly used shower arrays. combination two detectors single, compact unit provides unique that opens rich possibilities study showers.
A prototype composed of four resistive plate chamber layers has been exposed to quasi-monoenergetic neutrons produced from a deuteron beam varying energy (300 1500 AMeV) in experiment S406 at GSI, Darmstad, Germany. Each layer, with an active area about 2000 × 500 mm2, is made modules containing the gaps, all multigap construction. gap defined by 0.3 mm nylon mono-filaments positioned between 2.85 thick float glass electrodes. The are operated avalanche mode non-flammable gas mixture 90%...
The HADES collaboration uses the e + − production as a probe of resonance matter produced in collisions at incident energies 1-3.5 GeV/nucleon GSI. Elementary reactions provide useful references for these studies and give information on Dalitz decays (R→Ne ). Such processes are sensitive to structure time-like electromagnetic baryon transitions kinematic range where (off-shell) vector mesons play crucial role. Results obtained proton-proton commissioning pion-beam experiment reported...
A prototype composed of four resistive plate chamber layers has been exposed to quasi-monoenergetic protons produced from a deuteron beam varying energy (200 800 AMeV) in experiment S406 at GSI, Darmstadt, Germany. The aim the is characterize response this range, which deposit 1.75 6 times more than minimum ionizing particles. Each layer, with an active area about 2000 × 500 mm2, made modules containing gaps, all multigap construction. gap defined by 0.3 mm nylon mono-filaments positioned...
We present first results from a Positron Emission Tomography (PET) scanner demonstrator based on Resistive Plate Chambers and specialized for brain imaging. The device features 30 cm wide cubic field-of-view each detector comprises 40 gas gaps with 3D location of the interaction point photon. Besides other imagery, we show that reconstructed image resolution, as evaluated by hot-rod phantom, is sub-millimetric, which beyond state-of-the-art standard PET technology this application.
The design and performance of a 1.2 liter liquid xenon chamber equipped with 7 two-inch photomultiplier tubes, the purpose studying scintillation response to /spl gamma/-rays neutrons, is described. Measurements indicate high VUV light collection efficiency resulting in sim/5.5 photoelectrons per 1 keV deposited energy. energy resolution (FWHM) 18% 22%, for 122 511 gamma/-rays, respectively. An algorithm reconstruction coordinates (x,y) plane was developed tested. position estimated be...
Large area arrays composed by dispersed stations are of major importance in experiments where Extended Air Shower (EAS) sampling is necessary. In those mandatory to have detectors that requires very low maintenance and shows good resilience environmental conditions. 2012 our group started work RPCs could become acceptable candidates operate within these Since time, more than 30 complete were produced, tested installed different places, both indoor outdoor. The data analysis be presented...