Roberto Baginski B. Santos

Roberto Baginski B. Santos
University Center of FEI · Department of Physics

PhD

About

59
Publications
17,413
Reads
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335
Citations
Additional affiliations
March 2004 - present
University Center of FEI
Position
  • Professor
Description
  • Teaching of introductory and modern physics to engineering and computer science undergrads.
March 2004 - present
Centro Universitário FEI
Position
  • Professor (Associate)
Education
July 1998 - October 2003
University of São Paulo
Field of study
  • Physics

Publications

Publications (59)
Article
Coupled oscillators are among the simplest composite quantum systems in which the interplay of entanglement and interaction may be explored. We examine the effects of coupling on the quantum fluctuations of the coordinates and momenta of the oscillators in a single-excitation entangled Bell-like state. We discover that coupling acts as a mechanism...
Preprint
Full-text available
Coupled oscillators are among the simplest composite quantum systems in which the interplay of entanglement and interaction may be explored. We examine the effects of coupling on fluctuations of the coordinates and momenta of the oscillators in a single-excitation entangled state. We discover that coupling acts as a mechanism for noise transfer bet...
Article
The COTS power transistors based in GaN were exposed to TID effects by 10-keV X-rays. These HEMTs were tested in the On-and Off-state bias conditions. Switching tests were performed before and after irradiation steps. The devices were characterized at temperatures ranging from − 50 • C to +75 • C. The results indicate that the GaN-technology is a g...
Article
Full-text available
The possibility to use a special class of heavy-ion induced direct reactions, such as double charge exchange reactions, is discussed in view of their application to extract information that may be helpful to determinate the nuclear matrix elements entering in the expression of neutrinoless double beta decay half-life. The strategies adopted in the...
Article
The NUMEN project aims at accessing experimentally driven information on Nuclear Matrix Elements (NME) involved in the half-life of the neutrinoless double beta decay (0νββ). In this view measurements of Heavy Ion (HI) induced Double Charge Exchange (DCE) reaction cross sections are performed with high-accuracy. In particular, the (18O,18Ne) and (2...
Article
Neutrinoless double beta decay of nuclei, if observed, would have important implications on fundamental physics. In particular it would give access to the effective neutrino mass. In order to extract such information from 0νββ decay half-life measurements, the knowledge of the Nuclear Matrix Elements (NME) is of utmost importance. In this context t...
Conference Paper
The NUMEN project aims at accessing experimentally driven information on Nuclear Matrix Elements (NME) involved in the half-life of the neutrinoless double beta decay (0νββ), by high-accuracy measurements of Heavy Ion (HI) induced Double Charge Exchange (DCE) reaction cross sections. In particular, the (¹⁸O,¹⁸Ne) and (²⁰Ne,²⁰O) reactions are used a...
Article
The NUMEN project aims at accessing experimentally driven information on Nuclear Matrix Elements (NME) involved in the half-life of the neutrinoless double beta decay (0υββ), by high-accuracy measurements of the cross sections of Heavy Ion (HI) induced Double Charge Exchange (DCE) reactions. Particular interest is given to the (¹⁸O,¹⁸Ne) and (²⁰Ne,...
Article
The NUMEN main goal is the extraction from measured cross-sections of “data-driven” information on Nuclear Matrix Elements for all the systems candidate for 0νββ. The idea is to use as experimental tool Heavy Ions –Double Charge Exchange (HI-DCE) reactions. Crucial for the experimental challanges is the INFN Laboratori Nazionali del Sud (LNS) facil...
Article
Full-text available
An updated overview of recent results on Heavy-Ion induced reactions of interest for neutrinoless double beta decay is reported in the framework of the NUMEN project. The NUMEN idea is to study heavy-ion induced Double Charge Exchange (DCE) reactions with the aim to get information on the nuclear matrix elements for neutrinoless double beta (0νββ)...
Article
Full-text available
The possibility to use a special class of heavy-ion induced direct reactions, such as double charge exchange reactions, is discussed in view of their application to extract information that may be helpful to determinate the nuclear matrix elements entering in the expression of neutrinoless double beta decay half-life. The methodology of the experim...
Preprint
Full-text available
The article describes the main achievements of the NUMEN project together with an updated and detailed overview of the related R&D activities and theoretical developments. NUMEN proposes an innovative technique to access the nuclear matrix elements entering the expression of the lifetime of the double beta decay by cross section measurements of hea...
Article
Full-text available
The article describes the main achievements of the NUMEN project together with an updated and detailed overview of the related R&D activities and theoretical developments. NUMEN proposes an innovative technique to access the nuclear matrix elements entering the expression of the lifetime of the double beta decay by cross section measurements of hea...
Conference Paper
Electronic systems functionality degrades when these systems are operating in harsh environments such as those where they are exposed to ionizing radiation. Understanding and measuring these effects is extremely important in order to design systems that can operate reliably. This work discusses experimental data of heavy ion and x-ray radiation eff...
Conference Paper
Electronic devices exposed to ionizing radiation exhibit degradation on their electrical characteristics, which may compromise the functionality of the device. Understanding the physical phenomena responsible for radiation damage, which may be specific to a particular technology, it is of extreme importance to develop methods for testing and recove...
Poster
Full-text available
Electronic systems’ functionality degrades when these systems are operating in harsh environments, such as those where they are exposed to ionizing radiation. Understand and measure these effects are extremely important in order to design systems that can tolerate ionizing radiation. Digital systems are often used on space applications to process d...
Article
Full-text available
Resumo: Apresentamos os primeiros resultados da introdução de uma metodologia ativa de aprendizagem apropriada para turmas grandes de física básica para cursos de engenharia, visando à melhoria da compreensão conceitual e da habilidade de resolver problemas, levando a uma aprendizagem mais significativa do que a obtida com as metodologias mais trad...
Conference Paper
Full-text available
Apresentamos os primeiros resultados da introdução de uma metodologia ativa de aprendizagem apropriada para turmas grandes de física básica para cursos de engenharia, visando à melhoria da compreensão conceitual e da habilidade de resolver problemas, levando a uma aprendizagem mais significativa do que a obtida com as metodologias mais tradicionais...
Conference Paper
Full-text available
As the use of Field Programmable Gate Arrays (FPGAs) in space and in other strategic areas increases, concerns about their tolerance to radiation also increases. This work reports the observation of soft and hard errors in a Xilinx Spartan-3E commercial off-the-shelf FPGA when exposed to low-dose rate, low energy X-rays during a dynamic test in whi...
Article
Full-text available
Recently, p-channel metal-oxide-semiconductor (pMOS) transistors were suggested as fit for the task of detecting and quantifying ionizing radiation dose. Linearity, small detection volume, fast readout, portability, low power consumption and low radiation attenuation are some of the pMOS advantages over PIN diode and thermoluminiscent dosimeters. A...
Conference Paper
Full-text available
Asymmetric tunneling was already observed in several open systems, that is, systems coupled to the environment or to an external system. In such open systems, quantum coherence is expected to decay rapidly according to the master equation approach. However, long-lived quantum coherence was also observed even in very noisy environments. In a recent...
Article
In this work, the first successful SEE measurements with heavy ions in Brazil is reported. The heavy ions were produced at the São Paulo 8 UD Pelletron accelerator. 12C, 16O, 19F, 28Si, 35Cl, 63Cu and 107Ag heavy ion beams were used to test a commercial off-the-shelf transistor. During irradiation, the response of a pMOS transistor was continuously...
Conference Paper
Full-text available
Within the areas of nanoscience and nanotechnology, oxide thin films have been widely studied owing to their optical, chemical, and electrical properties. Among them, TiO2 is an extremely promising material because of its properties, which lead to a range of technological applications. it is worth highlighting TiO2 as a biocompatible material [1],...
Conference Paper
Full-text available
1. Abstract Electronic devices exposed to radiation suffer degradation on their electrical characteristics, as the threshold voltage, which can be recovered by thermal annealing treatment. The aim of this work is to characterize irradiated MOSFETs and analyze the behavior of thermal annealing processes, in order to understand the temperature effect...
Conference Paper
Full-text available
1.Abstract Ionizing radiation modifies the characteristic parameters of an electronic device, and the threshold voltage is usually one of the most affected parameters. Therefore, assessment of the damage caused by ionizing radiation may be performed by checking the variation of the threshold voltage of the device. In order to do that, it is necessa...
Article
We present a simple non-Hermitian model to describe the phenomenon of asymmetric tunneling between two energy-degenerate sites coupled by a non-reciprocal interaction without dissipation. The system was described using a biorthogonal family of energy eigenvectors, the dynamics of the system was determined by the Schrödinger equation, and unitarity...
Conference Paper
Full-text available
Three facilities in Brazil are being prepared and upgraded to test and to qualify electronic devices regarding their tolerance to TID and SEE: a 60 kV X-ray source, a 1.7 MV Pelletron accelerator for low energy proton beams and an 8 MV Pelletron accelerator that produces heavy ion beams. MOSFET transistors were exposed to 10-keV X-rays and to 2.4 M...
Conference Paper
Full-text available
A remarkable 4 dB asymmetry was recently observed in the transmission of circularly polarized electromagnetic waves through a 2D-chiral semitransparent mirror. Therefore, the transmission probability for circularly polarized photons incident on the front face of the mirror is very different from the total transmission probability for circularly pol...
Conference Paper
Full-text available
In this work, P- and N-MOSFETs (Metal Oxide Semiconductor Field Effect Transistor) were submitted to X-ray and ion beams. CD 4007, a commercial off-the-shelf integrated circuit composed of six transistors, three P-type and three N-type, in a single package, was used. The integrated circuits were exposed to 60 MeV 35Cl ion beams using the São Paulo...
Conference Paper
Full-text available
Electronic circuits are strongly influenced by ionizing radiation. The necessity to develop integrated circuits (IC's) featuring radiation hardness is largely growing to meet the stringent environment in space electronics. This work aims to development a test platform to qualify electronic devices under the influence of high radiation dose, for aer...
Article
Inspired by a recently observed asymmetry in the transmission of circularly polarized light through a metamaterial, we present a non-hermitian PT-symmetric quantum model to describe the interaction of the light fields in two resonant cavities coupled via a 2D-chiral mirror. We compute the time evolution of the light fields in this model, find two s...
Article
Full-text available
IV-characteristics from ELT Overlapping Circular-Gate Transistors (O-CGT's) and rectangular-gate transistors are cross-checked after X-ray exposure. No degradation on O-CGT subthreshold behavior observed for doses up to 2.3 Grad. Devices were prototyped on standard 0.35 µm CMOS process.
Article
We analyze wave propagation in the vacuum of Podolsky regularized electrodynamics. Two kinds of waves were found in the theory: the traditional non-dispersive waves of Maxwell electrodynamics, and a dispersive wave reminiscent of wave propagation in a collisionless plasma. Charged particle concentration was determined, and found to be huge in this...
Article
We present a simple method to analyze time series, and estimate the parameters needed to control chaos in dynamical systems. Application of the method to a system described by the logistic map is also shown. Analyzing only two 100-point time series, we achieved results within 2% of the analytical ones. With these estimates, we show that OGY control...
Article
The study of ionizing radiation effects on semiconductor devices is of great relevance for the global technological development and is a necessity in some strategic areas in Brazil. This work presents preliminary results of radiation effects in MOSFETs that were exposed to 3.2 Grad radiation dose produced by a 2.6-MeV proton beam. The focus of this...
Conference Paper
Full-text available
A física moderna merece crédito por grande parte das tecnologias inovadoras desenvolvidas no século XX e seu conhecimento é imprescindível para a formação profissional de engenheiros prontos para enfrentar os desafios emergentes de uma economia do conhecimento no século XXI. Para enfrentar estes desafios, argumentamos que a formação profissional co...
Conference Paper
Full-text available
O objetivo deste trabalho é o de analisar uma metodologia de aplicação de uma ferramenta de educação a distância (EaD) em uma disciplina de um curso presencial de engenharia. Buscamos identificar qual é o sentimento observado nos alunos e o impacto quando estes são obrigados a utilizar uma plataforma LMS (Learning Management System) como instrument...
Chapter
We show how the indistinguishable nature of the interaction of a collection of cold atoms with the electromagnetic field in an optical cavity leads to entanglement and a very fast radiative decay dynamics. This acceleration of spontaneous emission has important consequences in the process known as radiative escape, one of the most important sources...
Conference Paper
Full-text available
Lack of a cognitive structure suitable to acquire and retain knowledge in a meaningful way is one of the most common reasons why a student fails in a course. Retaking the course is not enough to structure acquisition and retention of knowledge, not helping students in achieving academic success. Students failing a course several times and eventuall...
Conference Paper
Full-text available
A great effort has been devoted to discuss the role of distance education in providing a flexible and accessible learning environment for all levels of formal education. Although this is one of the most appealing motivations sustaining the importance of this field, there are many other reasons why educational institutions should put distance educat...
Thesis
Full-text available
We present two models for the electron in classical electrodynamics, which include some effects from quantum electrodynamics. In the first model, the electron is treated as an extended particle owing to the high-frequency oscillations (Zitterbewegung) of its electrical charge. We show that this model predicts correctly the magnitude of the electron...
Chapter
We show how the modified electromagnetic vacuum of a resonant optical cavity can be used to manipulate the collisional dynamics between cold atoms by a modification of spontaneous emission times. Multiparticle entanglement and a higher spectral density of modes enhance spontaneous emission and alter the dynamics of cold collisions. A specific situa...
Article
We show how the dynamics of collisions between cold atoms can be manipulated by a modification of spontaneous emission times. This is achieved by placing the atomic sample in a resonant optical cavity. Spontaneous emission is enhanced by a combination of multiparticle entanglement together with a higher density of modes of the modified vacuum field...
Article
We discuss, in the context of classical electrodynamics with a Lorentz invariant cutoff at short distances, the self-force acting on a point charged particle. It follows that the electromagnetic mass of the point charge occurs in the equation of motion in a form consistent with special relativity. We find that the exact equation of motion does not...
Article
The interaction between a very thin macroscopic solenoid, and a single magnetic particle precessing in a external magnetic field $\vec{B}_0$, is described by taking into account the thermal and the zero-point fluctuations of stochastic electrodynamics. The inductor belongs to a RLC circuit without batteries and the random motion of the magnetic dip...
Article
The interaction of a microscopic magnetic dipole and the inductor of a RLC circuit without batteries, is described using the approach of stochastic electrodynamics. The purpose of this study is to clarify the effects of the current fluctuations on the paramagnetic behaviour of a sample of magnetic material which is close to a thin solenoid. A suppr...
Article
We discuss a simple model where the electron is approximately described by a rapidly spinning disk of radius λ=ℏ/mc, such that the linear speed at its border is c. We assume that the particle's mass is uniformly distributed over the surface of the disk and its electric charge is strongly peaked around the border. It follows that the spin of the par...

Projects

Projects (3)
Project
The goal of this project is to model open quantum systems with tools derived from non hermitian quantum mechanics.
Project
I'm currently working on natural radiation: risk index calculation in building materials, ingestion dose for food and natural radiation in industrial waste. In electronic devices I'm working on ESS tests and TID with ARM cortex M0; mechanisms of damage to transistors with protons and TID; methodology radiation tests in amplifier.