R. Ferreira‐Marques
A5037908121- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Dark Matter and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Radiation Therapy and Dosimetry
- High-Energy Particle Collisions Research
- Nuclear Materials and Properties
- Particle Accelerators and Free-Electron Lasers
- CCD and CMOS Imaging Sensors
- Spectroscopy and Laser Applications
- Neutrino Physics Research
- Superconducting Materials and Applications
- Astro and Planetary Science
- Atomic and Molecular Physics
- Atmospheric Ozone and Climate
- Radiation Effects in Electronics
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2006-2022
University of Lisbon
2012-2022
University of Coimbra
2008-2018
Pôle Universitaire Léonard de Vinci
2009-2011
Universidad Politécnica de Madrid
2011
European Organization for Nuclear Research
2011
FH Campus Wien
2009
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
1998-2009
CEA Paris-Saclay
1998-2009
Centre National de la Recherche Scientifique
1996-2009
Young massive clusters (YMCs) with stellar masses of 104–105 M☉ and core densities stars per cubic pc are thought to be the "missing link" between open extreme extragalactic super star globular clusters. As such, studying initial conditions YMCs offers an opportunity test cluster formation models across full mass range. G0.253 + 0.016 is excellent candidate YMC progenitor. We make use existing multi-wavelength data including recently available far-IR continuum (Herschel/Herschel Infrared...
A high-resolution measurement of the neutron-induced fission cross section $^{234}\mathrm{U}$ and $^{237}\mathrm{Np}$ has been performed at CERN Neutron Time-of-Flight facility. The sections have determined in a wide energy range from 1 eV to GeV using evaluated $^{235}\mathrm{U}$ as reference. In these measurements determination for resonances could be improved, whereas previous discrepancies were confirmed. New cross-section data are provided high neutron energies that go beyond limits...
The cross section of the reaction $^{197}\mathrm{Au}$($n,\ensuremath{\gamma}$) was measured with time-of-flight technique at n_TOF (neutron time-of-flight) facility in unresolved resonance region between 5 and 400 keV using a pair ${\mathrm{C}}_{6}$D${}_{6}$ (where D denotes $^{2}\mathrm{H}$) liquid scintillators for detection prompt capture $\ensuremath{\gamma}$ rays. results total uncertainty $3.9%--6.7$$%$ resolution 20 bins per energy decade show fair agreement Evaluated Nuclear Data...
We have measured the neutron capture cross sections of stable magnesium isotopes ${}^{24,25,26}$Mg in energy range interest to $s$ process using time-of-flight facility n_TOF at CERN. Capture events from a natural metal sample and samples enriched ${}^{25}$Mg ${}^{26}$Mg were recorded total method based on C${}_{6}$${}^{2}$H${}_{6}$ detectors. Neutron resonance parameters extracted by simultaneous shape analysis present data existing transmission isotopic sample. Maxwellian-averaged for...
We use fits to recent published CPLEAR data on neutral kaon decays $π^+π^-$ and $πeν$ constrain the CPT--violation parameters appearing in a formulation of system as an open quantum-mechanical system. The obtained upper limits are approaching range suggested by certain ideas concerning quantum gravity.
The ($n,\ensuremath{\gamma}$) cross section of $^{197}\mathrm{Au}$ has been measured at n_TOF in the resolved resonance region, up to 5 keV, with aim improving accuracy an energy range where it is not yet considered standard. measurements were performed two different experimental setup and detection techniques, total method based on ${\mathrm{C}}_{6}$${\mathrm{D}}_{6}$ detectors, absorption calorimetry a 4$\ensuremath{\pi}$ BaF${}_{2}$ array. By comparing data collected accurate sets...
The151Sm(n,gamma)152Sm cross section has been measured at the spallation neutron facility n_TOF CERN in energy range from 1 eV to MeV. The new combines excellent resolution time-of-flight, low repetition rates, and an unsurpassed instantaneous luminosity, resulting rather favorable signal/background ratios. 151Sm is of importance for characterizing capture nucleosynthesis asymptotic giant branch stars. At a thermal kT=30 keV Maxwellian averaged this unstable isotope (t(1/2)=93 yr) was...
The neutron capture cross sections of the Zr isotopes have important implications in nuclear astrophysics and for reactor design. small section magic nucleus $^{90}\mathrm{Zr}$, which accounts more than 50% natural zirconium represents one key stellar $s$-process, because it acts as a bottleneck chain between Fe seed heavier isotopes. same element, Zr, also is an component structural materials used traditional advanced reactors. ($n,\ensuremath{\gamma}$) has been measured at CERN, using...
The ($n,\ensuremath{\gamma}$) reaction of the radioactive isotope ${}^{93}$Zr has been measured at n_TOF high-resolution time-of-flight facility CERN. Resonance parameters have extracted in neutron energy range up to 8 keV, yielding capture widths smaller (14$%$) than reported an earlier experiment. These results are important for detailed nucleosynthesis calculations and refined studies waste transmutation concepts.
The neutron capture cross section of $^{209}\mathrm{Bi}$ has been measured at the CERN n_TOF facility by employing pulse-height-weighting technique. Improvements over previous measurements are mainly because an optimized detection system, which led to a practically negligible sensitivity. Additional experimental sources systematic error, such as electronic threshold in detectors, summing \ensuremath{\gamma}-rays, internal electron conversion, and isomeric state bismuth, have taken into...
In this paper, we present experimental and simulated results from a first prototype of positron emission tomography (PET) system based on the resistive plate chamber (RPC) technology-a gaseous particle detector developed for high energy physics. The is aimed at validating expectations, derived simulations, with submillimeter spatial image resolution no parallax error, which may be useful imaging small animals. By point-like <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
The objective of this paper is to present a remote laboratory in the context power electronics education. New technologies and developments are compelling educators deeply reflect on traditional means teaching. Modern curricula require new ways conception implementation innovative pedagogical approaches. Often, these approaches novel technological realizations. Although e-learning facilities increasingly being used engineering education, often, they based simulations and/or emulations...
Neutron resonance analyses have been performed for the capture cross sections of $^{186}\mathrm{Os}$, $^{187}\mathrm{Os}$, and $^{188}\mathrm{Os}$ measured at n_TOF facility cern. Resonance parameters extracted up to 5, 3, 8 keV, respectively, using sammy code a full $R$-matrix fit yields. From these results average were derived by statistical analysis provide comprehensive experimental basis modeling stellar neutron rates isotopes in terms Hauser-Feshbach model. Consistent calculations...
Because the relatively small neutron capture cross sections of zirconium isotopes are difficult to measure, results previous measurements often not adequate for a number problems in astrophysics and nuclear technology. Therefore, $^{92}\mathrm{Zr}$($n,\ensuremath{\gamma}$) section has been remeasured at CERN n_TOF facility, providing set improved parameters 44 resonances energy range up 40 keV. With this information cross-section uncertainties keV region could be reduced $5%$ as required...
Neutron-induced fission cross sections for ${}^{\text{nat}}$Pb and $^{209}\mathrm{Bi}$ were measured with a white-spectrum neutron source at the CERN Neutron Time-of-Flight (n_TOF) facility. The experiment, using neutrons from threshold up to 1 GeV, provides first results these nuclei above 200 MeV. relative $^{235}\mathrm{U}$ $^{238}\mathrm{U}$ in dedicated chamber parallel plate avalanche counter detectors. Results are compared previous experimental data. Upgraded parametrizations of...