Navegação Ciências Exatas e da Terra por Autor "Souza, Sergio Ricardo de Azevedo"
Resultados 1-16 de 16
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Comparison of statistical treatments for the equation of state for core-collapse supernovae
(2009) [Artigo de periódico]Neutrinos emitted during the collapse, bounce, and subsequent explosion provide information about supernova dynamics. The neutrino spectra are determined by weak interactions with nuclei and nucleons in the inner regions ... -
Dynamical model for competing opinions
(2012) [Artigo de periódico]We propose an opinion model based on agents located at the vertices of a regular lattice. Each agent has an independent opinion (among an arbitrary, but fixed, number of choices) and its own degree of conviction. The latter ... -
Early appraisal of the fixation probability in directed networks
(2010) [Artigo de periódico]In evolutionary dynamics, the probability that a mutation spreads through the whole population, having arisen from a single individual, is known as the fixation probability. In general, it is not possible to find the ... -
Effects of geometric constraints on the nuclear multifragmentation process
(2007) [Artigo de periódico]We include in statistical model calculations the facts that in the nuclear multifragmentation process the fragments are produced within a given volume and have a finite size. The corrections associated with these constraints ... -
Experimental analysis of lateral impact on planar brittle material
(2010) [Artigo de periódico]The fragmentation of alumina and glass plates due to lateral impact is studied. A few hundred plates have been fragmented at different impact velocities and the produced fragments are analyzed. The method employed in this ... -
Experimental analysis of lateral impact on planar brittle material : spatial properties of cracks
(2011) [Artigo de periódico]The breakup of alkaline glass and alumina plates due to planar impacts on one of their lateral sides is studied. Particular attention is given to investigating the spatial location of the cracks within the plates. Analysis ... -
Finite-size effects in isobaric ratios
(2012) [Artigo de periódico]The properties of isobaric ratios, between nuclei produced in the same reaction, are investigated using the canonical and grand-canonical statistical ensembles. Although the grand-canonical formulas furnish a means to ... -
Influence of secondary decay on odd-even staggering of fragment cross sections
(2013) [Artigo de periódico]Odd-even staggering (OES) appears inmany areas of nuclear physics and is generally associated with the pairing term in the nuclear binding energy. To explore this effect, we use the improved statistical multifragmentation ... -
Influence of the density of states on the odd-even staggering in the charge distribution of the emitted fragments in nuclear heavy-ion collisions
(2014) [Artigo de periódico]The fragmentation of thermalized sources is studied using a version of the Statistical MultifragmentationModel which employs state densities that take the pairing gap in the nuclear levels into account. Attention is focused ... -
Internal and kinetic temperatures of fragments in the framework of a nuclear statistical multifragmentation model
(2015) [Artigo de periódico]The agreement between the fragments’ internal and kinetic temperatures with the breakup temperature is investigated using a statistical multifragmentation model, whichmakes no a priori assumption on the relationship between ... -
Isospin effects and the density dependence of the nuclear symmetry energy
(2009) [Artigo de periódico]The density dependence of the nuclear symmetry energy is inspected using the statistical multifragmentation model with Skyrme effective interactions. The model consistently considers the expansion of the fragments' volumes ... -
Network growth for enhanced natural selection
(2009) [Artigo de periódico]Natural selection and random drift are competing phenomena for explaining the evolution of populations. Combining a highly fit mutant with a population structure that improves the odds that the mutation spreads through the ... -
Probing the symmetry energy from the nuclear isoscaling
(2008) [Artigo de periódico]Using different parametrizations of the nuclear mass formula, we study the sensitivity of the isoscaling parameters to the mass formula employed in grand-canonical calculations. Previous works on isoscaling have suggested ... -
Statistical multifragmentation model with discretized energy and the generalized Fermi breakup : formulation of the model
(2013) [Artigo de periódico]The generalized Fermi breakup model, recently demonstrated to be formally equivalent to the statistical multifragmentation model, if the contribution of excited states is included in the state densities of the former, is ... -
Statistical multifragmentation model with Skyrme effective interactions
(2009) [Artigo de periódico]The statistical multifragmentation model is modified to incorporate the Helmholtz free energies calculated in the finite temperature Thomas-Fermi approximation using Skyrme effective interactions. In this formulation, the ... -
Temperature effects in nuclear isoscaling
(2009) [Artigo de periódico]The properties of the nuclear isoscaling at finite temperature are investigated and the extent to which its parameter α holds information on the symmetry energy is examined. We show that, although finite temperature effects ...
