A5068484016- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear physics research studies
- Electron and X-Ray Spectroscopy Techniques
- Radiation Shielding Materials Analysis
- Atomic and Molecular Physics
- Ergonomics and Musculoskeletal Disorders
- Nuclear reactor physics and engineering
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Advanced Chemical Physics Studies
- Neutrino Physics Research
- Cold Fusion and Nuclear Reactions
- Astronomical and nuclear sciences
- Advanced Radiotherapy Techniques
- Gamma-ray bursts and supernovae
- Hand Gesture Recognition Systems
- Radiation Therapy and Dosimetry
- Dental Health and Care Utilization
- Dental Erosion and Treatment
- Graphite, nuclear technology, radiation studies
- Ion-surface interactions and analysis
- Astro and Planetary Science
- Boron Compounds in Chemistry
- Particle accelerators and beam dynamics
University of Lisbon
2007-2024
University of Arkansas for Medical Sciences
2024
Universidade Federal da Bahia
2023
Universidade Nova de Lisboa
2013-2022
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2018-2022
Rede de Química e Tecnologia
2017
Instituto Superior Técnico
2014
We report on a new measurement of the 14N(p,γ)15O capture cross section at Ep=140 to 400 keV using kV LUNA accelerator facility Laboratori Nazionali del Gran Sasso (LNGS). The uncertainties have been reduced with respect previous measurements and their analysis. analyzed data R-matrix method we find that ground state transition accounts for about 15% total S-factor. main contribution S-factor is given by 6.79 MeV state. S(0)=1.7±0.2 b, in agreement recent extrapolations. result has important...
The transition between the Main Sequence and Red Giant Branch in low mass stars is powered by onset of CNO burning, whose bottleneck 14N(p, O. LUNA collaboration has recently improved energy measurements cross section this key reaction. We analyse impact revised reaction rate on estimate Globular Cluster ages, as derived from turnoff luminosity. found that age oldest Clusters should be increased about 0.7-1 Gyr with respect to current estimates.
In stars with temperatures above 20×106K, hydrogen burning is dominated by the CNO cycle. Its rate determined slowest process, 14N(p, γ)15O reaction. Deep underground in Italy's Gran Sasso laboratory, at LUNA 400 kV accelerator, cross section of this reaction has been measured energies much lower than ever achieved before. Using a windowless gas target and 4π BGO summing detector, direct data obtained down to 70 keV, reaching value 0.24 picobarn. The Gamow peak covered experimental for...
The electron screening effect in the d(d, p)t reaction has been studied for 29 deuterated metals and 5 insulators/semiconductors. As compared to measurements performed with a gaseous D2 target, large observed V, Nb, Ta, which belong group of periodic table, as well Cr, Mo, W (group 6), Mn Re 7), Fe Ru 8), Co, Rh, Ir 9), Ni, Pd, Pt 10), Zn Cd 12), Sn Pb 14). In contrast, comparatively small is found 4 (Ti, Zr, Hf), 11 (Cu, Ag, Au), 13 (B, Al), insulator BeO, semiconductors C, Si, Ge. An...
Introdução: As queimaduras e corrosões são lesões que impactam significativamente a saúde pública, gerando alta taxa de morbidade mortalidade. A cirurgia plástica reconstrutiva tem papel fundamental na recuperação funcional estética desses pacientes, melhorando sua qualidade vida. O avanço em protocolos tratamento técnicas cirúrgicas contribuído para redução da mortalidade melhores desfechos clínicos. Objetivo: Analisar o perfil epidemiológico clínico das internações hospitalares vítimas no...
The electron screening in the d(d, p)t reaction has been studied for deuterated metal Pt at a sample temperature T = 20 °C–340 °C and Co 200 °C. enhanced decreases with increasing temperature, where data agree plasma model of Debye applied to quasi-free metallic electrons. represent first observation dependence nuclear cross section. We also measured effect Ti (an element group 4 periodic table) −10 °C–200 °C: above 50 °C, hydrogen solubility dropped values far below 1 large became...
The 6Li(p,α)3He and 7Li(p,α)4He reaction cross sections were obtained for E = 90–580 keV 90–1740 keV, respectively. R-matrix polynomial fits to the bare astrophysical S-factor confirmed, with improved accuracy, previous work data, yielding Sb(0) 3.52 ± 0.08 MeV b, 55.6+0.8−1.7 b 6Li 7Li reactions, Therefore, consequences related these two isotopes remain essentially unchanged. With present Sb(E) a reanalysis of low energy data different environments—Li2WO4 insulator, Li metal, PdLix...