Brazilian Journal of Physics

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α-Cluster Optical Potential Model of 40Ca
Brazilian Journal of Physics - Tập 47 - Trang 189-196 - 2017
Zakaria M. M. Mahmoud, Kassem O. Behairy
Elastic scattering of α + 40Ca is analyzed in the framework of the optical model. We adopted an independent α-cluster model to generate the α-cluster and matter density of 40Ca. We proposed a parametrized form for the α-cluster density and fixed its parameters according to the available experimental data about the α-particle and 40Ca nuclei. The obtained α-cluster density of 40Ca is used to genera...... hiện toàn bộ
Obliquely Propagating Electron Acoustic Shock Waves in Magnetized Plasma
Brazilian Journal of Physics - Tập 48 - Trang 597-603 - 2018
Sona Bansal, Munish Aggarwal, Tarsem Singh Gill
Obliquely propagating electron acoustic shock waves in plasma with stationary ions, cold and superthermal hot electrons are investigated in magnetized plasma. Employing reductive perturbation method, Korteweg-de Vries-Burgers equation (KdVB) is derived in the small amplitude approximation limit. The analytical and numerical calculations of the KdVB equation show the variation of shock waves struct...... hiện toàn bộ
Fisher Information on the Phase Transition from Regular to Flat Top Optical Pulse in Cubic-Quintic Nonlinear Media
Brazilian Journal of Physics - Tập 54 - Trang 1-5 - 2023
Bijan Layek, Sk. Siddik, Golam Ali Sekh
We study the properties of optical pulses in cubic-quintic nonlinear media using Fisher information. The nonlinear media can support regular (sharp top) and flat top pulses depending on the type of quintic nonlinearity and the frequency of the pulse. For defocusing quintic nonlinearity, it holds both regular and flat top solitons. We find that the Fisher information suddenly drops near the transit...... hiện toàn bộ
Amplitude Death, Bifurcations, and Basins of Attraction of a Planar Self-Sustained Oscillator with Delayed Feedback
Brazilian Journal of Physics - Tập 52 Số 2 - 2022
Fabiola G. Prants, Cristian Bonatto
Time Periodicity and Dynamical Stability in Two-Boson Systems
Brazilian Journal of Physics - Tập 43 - Trang 5-12 - 2013
Jose Reslen
We calculate the period of recurrence of dynamical systems comprising two interacting bosons. A number of theoretical issues related to this problem are discussed, in particular, the conditions for small periodicity. The knowledge gathered in this way is then used to propose a notion of dynamical stability based on the stability of the period. Dynamical simulations show good agreement with the pro...... hiện toàn bộ
Electronic Structures and f-d Orbital Hybridization of a Heavy Fermion YbNiGa
Brazilian Journal of Physics - Tập 50 - Trang 35-38 - 2019
T. Jeong
The electromagnetic and thermal properties of a heavy fermion YbNiGa are investigated using first-principle methods with local density approximation (LDA) and LDA+U approaches. The Yb f-bands are located near the Fermi energy and hybridized with the Ni-3d states. This hybridization plays important roles to make characteristics of this material. Band calculation with the LDA framework does not matc...... hiện toàn bộ
First-Principles Study of Pressure-Induced Phase Transition in CuGaO2
Brazilian Journal of Physics - Tập 47 - Trang 42-45 - 2016
Cheng-Lu Jiang, Qi-Jun Liu, Zheng-Tang Liu
We have studied the structural, elastic, electronic properties, and pressure-induced phase transition of CuGaO2 by using the plane-wave ultrasoft pseudopotential technique based on the first-principles density-functional theory (DFT). The obtained ground state properties of three phases were in agreement with previous works. The calculated enthalpy variations with pressure showed that the structur...... hiện toàn bộ
Correction to: Emergent D-Instanton as a Source of Dark Energy
Brazilian Journal of Physics - - 2019
Deobrat Singh
In the original article Supriya Kar was listed as a co-author without his permission. The sole author of this article is Deobrat Singh.
Finite Temperatures by Means of Zero Kelvin Kohn-Sham Formalism of Density-Functional Theory
Brazilian Journal of Physics - Tập 49 Số 5 - Trang 615-622 - 2019
Mateus B. P. Querne, Daniel Vieira
Effect of Band Nonparabolicity on the Inter Band Tunneling in Semiconductors
Brazilian Journal of Physics - Tập 48 - Trang 330-341 - 2018
Anup Dey, Maitreyee Biswas, Subhashis Maitra
A simple yet generalized theory is developed to study inter band tunneling property of narrow band gap III–V compound semiconductors. The band structures of these low band gap semiconductors with sufficiently separated split-off valance band are usually described by the three energy band model of Kane, so this has been adopted here for the analysis of interband tunneling property in the case of In...... hiện toàn bộ
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