J. R. B. Oliveira
A5014105477- Nuclear physics research studies
- Nuclear Physics and Applications
- Neutrino Physics Research
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Particle accelerators and beam dynamics
- Quantum Chromodynamics and Particle Interactions
- Advanced NMR Techniques and Applications
- Nuclear reactor physics and engineering
- X-ray Spectroscopy and Fluorescence Analysis
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Advanced Chemical Physics Studies
- Radiation Detection and Scintillator Technologies
- Quantum, superfluid, helium dynamics
- Rare-earth and actinide compounds
- Radioactive Decay and Measurement Techniques
- Particle Detector Development and Performance
- Ion-surface interactions and analysis
- Graphite, nuclear technology, radiation studies
- Quantum chaos and dynamical systems
- Electron and X-Ray Spectroscopy Techniques
- High-Energy Particle Collisions Research
- Radiation Therapy and Dosimetry
Universidade de São Paulo
2015-2024
Campbell Collaboration
2020-2023
Justus-Liebig-Universität Gießen
2023
Universidade Federal Fluminense
2009-2021
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Sud
2017-2020
Istituto Nazionale di Fisica Nucleare
2020
Istituto Nazionale di Fisica Nucleare, Sezione di Catania
2020
Universidade Cidade de São Paulo
2018
Universidad de Sevilla
2009-2018
Helmholtz-Zentrum Dresden-Rossendorf
1996-2013
Background: Charge-exchange (CE) reactions offer a major opportunity to excite nuclear isovector modes, providing important clues about the interaction in medium. Moreover, double charge-exchange are proving be tempting tool access transition matrix elements (NMEs) related beta-decay processes. The latter also of crucial importance extract neutrino properties from half-life hypothetical neutrinoless beta decay and search for physics beyond standard model.Purpose: Through multichannel...
Background: Single-charge-exchange reactions are appropriate tools to study the nuclear response one-particle/one-hole isospin probes, gaining additional interest from connection beta decay. This analogy has been recently extended second order, connecting double-charge-exchange and double decays. Nowadays, availability of powerful experimental setups advanced theories models allows one access precious information on key structure aspects embedded in widely sought neutrinoless decay.Purpose:...
Background: In recent years, the NUMEN project has highlighted that systematic study of double charge exchange (DCE) nuclear reactions could provide precious information on matrix elements neutrinoless $\ensuremath{\beta}$ decay. To achieve this goal, a multichannel approach was adopted, where plethora different reaction channels is measured under same experimental conditions and analyzed in coherent framework. context, initial (ISI) final (FSI) state interactions are fundamental building...
Background: A systematic exploration of one-nucleon transfer reactions induced by the ($^{18}\mathrm{O},^{19}\mathrm{F}$) and ($^{18}\mathrm{O},^{17}\mathrm{O}$) on different targets ($^{12}\mathrm{C}, ^{16}\mathrm{O}, ^{27}\mathrm{Al}, ^{40}\mathrm{Ca}, ^{48}\mathrm{Ti}, ^{76}\mathrm{Se}, ^{116}\mathrm{Sn}$) is being performed at Istituto Nazionale di Fisica Nucleare--Laboratori Nazionali del Sud (INFN-LNS) beam energies higher than Coulomb barrier. featured aspect adoption a multichannel...
In this work we present new coupled channel calculations with the São Paulo potential (SPP) as bare interaction, and an imaginary system energy independent normalization that has been developed to take into account dissipative processes in heavy-ion reactions. This is based on high-energy nucleon interaction nuclear medium. Our theoretical predictions for energies up ≈100MeV/nucleon agree very well experimental data p,n+nucleus, 16O + 27Al, 60Ni, 58Ni 124Sn, weakly bound projectile 7Li 120Sn systems.
Background: Heavy-ion induced two-nucleon transfer reactions are powerful tools to reveal peculiar aspects of the atomic nucleus, such as pairing correlations, single-particle and collective degrees freedom, more. Also, these processes in competition with direct meson exchange double charge reactions, which have recently attracted great interest due their possible connection neutrinoless double-\ensuremath{\beta} decay. In this framework, exploration $^{20}\mathrm{Ne}+^{116}\mathrm{Cd}$...
The 40 Ca( 18 O, F) K single charge exchange (SCE) reaction is explored at an incident energy of 275 MeV and analyzed consistently by collecting the elastic scattering inelastic data under same experimental conditions. Full quantum-mechanical SCE calculations direct mechanism are performed including microscopic nuclear structure inputs adopting either a bare optical potential or coupled channel equivalent polarization (CCEP) constrained data. describes magnitude shape angular distributions...
Single-nucleon transfer reactions are processes that selectively probe single-particle components of the populated many-body nuclear states. In this context, recent efforts have been made to build a unified description rich spectroscopy accessible in heavy-ion collisions. An example multichannel approach is study competition between successive nucleon and charge exchange reactions, latter being particular interest context single double beta decay studies. To extent, one-proton pickup...
Double charge exchange (DCE) reactions could provide experimentally driven information about nuclear matrix elements of interest in the context neutrinoless double-β decay. To achieve this goal, a detailed description reaction mechanism is mandatory. This requires full characterization initial and final-state interactions, which are poorly known for many projectile-target systems involved future DCE studies. Among these, we intend to study 20Ne + 130Te 18O 116Sn at 15.3 AMeV, particularly...
NUMEN proposes an innovative technique to access the nuclear matrix elements entering expression of lifetime double beta decay by cross-section measurements heavy-ion induced Double Charge Exchange (DCE) reactions. Despite fact that two processes, namely neutrinoless and DCE reactions, are triggered weak strong interaction respectively, important analogies suggested. The basic point is coincidence initial final state many-body wave functions in types processes formal similarity transition...
Purpose: We want to analyze transitions low-lying excited states of the residual and ejectile nuclei in 76Se(18O, 17O) 77Se one-neutron stripping reaction at 275-MeV incident energy determine role single-particle core excitation description measured cross sections. In addition, we explore sensitivity calculated section different nuclear structure models. Methods: The spectrum differential cross-section angular distributions are using MAGNEX large acceptance magnetic spectrometer for...
High precision elastic and inelastic angular distributions have been measured for the 16O + 27Al system at a beam energy of 100 MeV. The data analysis confirms rainbow formation as already predicted by parameter-free Coupled Channel calculations. It also helps to reveal crucial role couplings in heavier systems even energies far above Coulomb barrier. This feature, well known atomic/molecular scattering, is experimentally studied first time Nuclear Physics.
Background: Double charge exchange (DCE) nuclear reactions have recently attracted much interest as tools to provide experimentally driven information about matrix elements of in the context neutrinoless double-$\ensuremath{\beta}$ decay. In this framework, a good description reaction mechanism and complete knowledge initial final-state interactions are mandatory. Presently, not enough is known details optical potentials response isospin operators for many projectile-target systems proposed...
Neutrinos are so far the most elusive known particles, and in last decades many sophisticated experiments have been set up order to clarify several questions about their intrinsic nature, particular masses, mass hierarchy, nature of Majorana or Dirac particles. Evidence Neutrinoless Double-Beta Decay (NDBD) would prove that neutrinos thus improving understanding universe itself. Besides search for large underground direct experimental detection NDBD, NUMEN experiment proposes investigation a...
The $^{105}\mathrm{Rh}$ nucleus has been studied with the $^{100}\mathrm{Mo}(^{11}\mathrm{B},\ensuremath{\alpha}2n\ensuremath{\gamma})$ reaction at $43\phantom{\rule{0.3em}{0ex}}\text{MeV}$ incident energy. A rich variety of structures was observed high and low spins, using $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}\text{\ensuremath{-}}t$ $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}\text{\ensuremath{-}}\mathit{particle}$ coincidences directional correlation...
The 16O+27Al elastic and inelastic angular distributions have been measured in a broad range (13°<θlab<52°) at about 100 MeV incident energy. use of the MAGNEX large acceptance magnetic spectrometer ray-reconstruction analysis technique has crucial order to provide, same experiment, high-resolution energy spectra cross-section measurements distributed over more than seven orders magnitude down hundreds nb/sr.
Recently, a rainbow pattern in the elastic scattering of 16O + 27Al at Elab. = 100 MeV was reported. In present paper, we show that predicted change slope cross section, as function angle, is mostly due to far-side component scattering, which affected by inelastic couplings. The experimental data consistent with calculations up inflection point, where effect couplings significant. New data, very good agreement theoretical expectations around Coulomb are also presented.
The $^{10}\mathrm{B}+^{120}\mathrm{Sn}$ reaction has been investigated at ${E}_{\mathrm{Lab}}=37.5$ MeV. cross sections for different channels, such as the elastic scattering, excitation of ${2}^{+}$ and ${3}^{\ensuremath{-}}\phantom{\rule{4pt}{0ex}}^{120}\mathrm{Sn}$ states, ${1}^{+}$ state $^{10}\mathrm{B}$, $1n$ pick-up transfer, have measured. One-step distorted-wave Born approximation coupled-reaction-channels calculations performed in context double-folding S\~ao Paulo potential....
Background: Nucleon transfer reactions are selective tools for nuclear physics investigations. The theoretical and computational limits affecting in the past their data analysis could be nowadays surmounted thanks to advent of methods with refined approximations constraints, even when heavy-ion collisions considered.Purpose: Modern microscopic calculations heavy-ion-induced combined precise experimental offer chance accurately testing different reaction models as well structure description...