A5007105020- Nuclear physics research studies
- Nuclear Physics and Applications
- Radioactivity and Radon Measurements
- Radioactive contamination and transfer
- Atomic and Molecular Physics
- Graphite, nuclear technology, radiation studies
- Astronomical and nuclear sciences
- Geology and Paleoclimatology Research
- Nuclear and radioactivity studies
- Quantum Chromodynamics and Particle Interactions
- X-ray Spectroscopy and Fluorescence Analysis
- Microplastics and Plastic Pollution
- Archaeology and ancient environmental studies
- Recycling and Waste Management Techniques
- Maritime and Coastal Archaeology
- Isotope Analysis in Ecology
- Cold Fusion and Nuclear Reactions
- Amazonian Archaeology and Ethnohistory
- Pacific and Southeast Asian Studies
- biodegradable polymer synthesis and properties
- Radiopharmaceutical Chemistry and Applications
- Medical Imaging Techniques and Applications
- Radiation Dose and Imaging
- Nuclear reactor physics and engineering
- Geological formations and processes
Universidade Federal Fluminense
2016-2025
Universidade de Brasília
2024
Universidade de São Paulo
1989-2024
Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde
2020
Altera (United States)
2016
Charles University
2012
Scunthorpe General Hospital
2012
Instituto de Pesquisas Energéticas e Nucleares
2010
Universidad de Málaga
2010
National University of San Luis
2010
Comprehensive high precision complete and incomplete fusion cross sections have been measured for the $^{6}\mathrm{Li}+^{209}\mathrm{Bi}$, $^{7}\mathrm{Li}+^{209}\mathrm{Bi}$, $^{9}\mathrm{Be}+^{208}\mathrm{Pb}$ reactions, at energies near below Coulomb barrier. The experimental details analyses procedures characteristic $\ensuremath{\alpha}$-decay fission measurements are described. Three different methods used to conclusively show large suppression of around above average barrier, which is...
Complete fusion excitation functions for $^{9}$Be + $^{208}$Pb have been measured to high precision at near barrier energies. The experimental distribution extracted from these data allows reliable prediction of the expected complete cross-sections. However, cross-sections are only 68% those predicted. large observed incomplete products support interpretation that this suppression is caused by breaking up into charged fragments before reaching barrier. Implications radioactive nuclei discussed.
Excitation functions have been measured for the fusion of weakly bound nuclei ${}^{6}\mathrm{Li}$ and ${}^{7}\mathrm{Li}$ with ${}^{209}\mathrm{Bi}.$ The complete-fusion cross sections are lower than those predicted by models, being only 65% 75% ${}^{7}\mathrm{Li},$ respectively. Within uncertainties, this suppression is independent beam energy. Distinguishing complete from incomplete fusion, both experimentally in theoretical essential to understand process nuclei. A simple classical...
We discuss the uncertainties and misinterpretations that may arise from simultaneous plots of fusion reaction excitation functions different systems when weakly bound nuclei are involved, particularly halo nuclei.
The delayed x-ray detection technique was used to measure complete and incomplete fusion cross sections for the $^{9}\mathrm{Be}+^{144}\mathrm{Sm}$ reaction at sub- near-barrier energies. Elastic inelastic scattering this system were also measured. Reaction derived transfer of one neutron calculated. suppression above barrier, order 10%, is attributed $^{9}\mathrm{Be}$ breakup considerably smaller than value 30% found $^{9}\mathrm{Be}+^{208}\mathrm{Pb}$ system.
We study the behavior of fusion, breakup, reaction, and elastic scattering different projectiles on $^{64}\mathrm{Zn}$, at near above barrier energies. present fusion data with tightly bound $^{16}\mathrm{O}$ stable weakly $^{6}\mathrm{Li}$, $^{7}\mathrm{Li}$, $^{9}\mathrm{Be}$ projectiles. The are analyzed by coupled channel calculations. total cross sections for these systems not affected breakup process energies barrier. (noncapture) section is important close to Coulomb increases...
Angular distributions of the elastic scattering ${}^{6,7}\mathrm{Li}$ on ${}^{138}\mathrm{Ba}$ were measured, in energy range $21<~{E}_{\mathrm{lab}}<~32$ MeV. The analysis data was performed via optical model, using Woods-Saxon potential, order to find dependence real and imaginary parts nuclear potential. existence a threshold anomaly for ${}^{7}\mathrm{Li}$ its absence ${}^{6}\mathrm{Li}$ one observed. It is interpreted that breakup ${}^{6}\mathrm{Li}$, with dissociation smaller first...
The role of the breakup process weakly bounded light projectile ${}^{9}\mathrm{Be},$ on near barrier fusion reaction and elastic scattering, is investigated by two different approaches. cross sections for ${}^{9}\mathrm{Be}{+}^{64}\mathrm{Zn}$ system were compared with ones from other similar systems (the ${}^{16}\mathrm{O}{+}^{64}\mathrm{Zn}$ ${}^{14}\mathrm{N}{+}^{59}\mathrm{Co}).$ measurement scattering this was also used to study threshold anomaly. There are indications that suppression...
Microplastics are a global ubiquitous problem, which is becoming major issue of concern at scientific and political levels around the world. This study presents physical chemical characterizations microplastic debris comparison between spatial distribution anthropogenic activities in 4 Panamanian beaches located both sides Isthmus. Two them (Juan Diaz San Carlos beaches) toward Pacific Ocean, Panamá Province, whereas others (Palenque Punta Galeta Caribbean Sea, Colón Province. They were...
Elastic scattering of the weakly bound $^{9}\mathrm{Be}$ on $^{27}\mathrm{Al}$ was measured at near barrier energies. The optical model data analysis with real and imaginary parts a global double-folding potential does not show strong evidence usual threshold anomaly. same result obtained by using Woods-Saxon shape calculating strengths absorption radius. reason for this behavior may be explained presence break-up and∕or transfer channels low
The total fusion cross section for the $^{9}\mathrm{Be}+^{27}\mathrm{Al}$ system has been measured at energies close and above Coulomb barrier. Reaction sections this were derived from elastic scattering data, breakup-plus-transfer-channel estimated difference between these data cross-section fusion.
We describe the behaviour of fusion, break-up, reaction cross sections and elastic scattering weakly bound nuclei, at near above barrier energies. The total fusion are not affected by break-up process this energy regime. important energies close Coulomb barrier, even in systems with light targets, increase sections. also show that sub-barrier is responsible for vanishing usual threshold anomaly optical potential gives rise to a new type anomaly, named us as anomaly.