A5082015487- Nuclear physics research studies
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Neutrino Physics Research
- Astronomical and nuclear sciences
- Advanced Chemical Physics Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Advanced NMR Techniques and Applications
- Particle physics theoretical and experimental studies
- Astro and Planetary Science
- Quantum chaos and dynamical systems
- High-Energy Particle Collisions Research
- Rare-earth and actinide compounds
- Scientific Research and Discoveries
- High-pressure geophysics and materials
- Mass Spectrometry Techniques and Applications
- Origins and Evolution of Life
- X-ray Spectroscopy and Fluorescence Analysis
- Radiopharmaceutical Chemistry and Applications
- Gamma-ray bursts and supernovae
- Superconducting Materials and Applications
University of Lisbon
2004-2023
Indian Institute of Technology Roorkee
2011-2021
RIKEN Nishina Center
2017
University of York
2017
Instituto Superior Técnico
2007-2016
Istituto Nazionale di Fisica Nucleare
2008-2016
Central China Normal University
2013
University of Coimbra
1971-2008
Fundação para a Ciência e Tecnologia
1997-2006
Instituto Politécnico de Lisboa
1993-2006
The microscopic theory of the nuclear matter equation state at finite temperature is developed within Bloch--De Dominicis diagrammatic expansion. liquid gas phase transition symmetric identified, with a critical ${T}_{c}\ensuremath{\approx}20 \mathrm{MeV},$ using Argonne ${v}_{14}$ as bare $\mathrm{NN}$ interaction and phenomenological three-body force adjusted to give correct saturation point. Pure neutron asymmetric matter, relevant supernovae explosions, are also studied. It found that...
The absolute decay width of a single-particle level in deformed potential is evaluated exactly. Experimental data are analyzed by using the formalism developed here. It found that proton powerful tool to determine deformation nuclei as well probe small components wave functions decaying states. This will allow one study behavior resonances close drip line, and may guide future experiments.
The ideal of the open society, based on rational deliberation and pluralism, faces significant challenges in digital age. This study explores how affective polarization populist sentiments among young Portuguese voters reconfigure public space, conditioning democratic debate. Using a sample 130 first-time April 2024 legislative elections, we analyze relationship between populism, adherence to radical right-wing ideology levels polarization, considering role social networks as vectors these...
The half-lives ${T}_{1/2}$ for proton decay from the nuclei ${}_{53}^{109}\mathrm{I},$ ${}_{63}^{131}\mathrm{Eu},$ and ${}_{67}^{141}\mathrm{Ho}$ are evaluated exactly, assuming that emitted moves in a deformed single particle Nilsson level. calculated values of ${T}_{1/2},$ consistent with experiments, suggest deformation $\ensuremath{\beta}\ensuremath{\approx}0.14$ ${}_{53}^{109}\mathrm{I}$ $\ensuremath{\beta}\ensuremath{\approx}0.3--0.4$ ${}_{63}^{131}\mathrm{Eu}$...
Proton decay from odd-odd deformed nuclei is a long-standing unsolved problem. We present for the first time an exact solution using single particle Nilsson resonances. The lifetime found to depend strongly on level occupied by unpaired neutron, allowing clear assignment of its level. emitters 112Cs, 140Ho, 150Lu, and 150Lu(m) are considered. agreement with experimental data very good deformations 0.1<beta<0.19 112Cs -0.17<beta<-0.16 ground isomeric states 150Lu. In case two ranges...
Proton radioactivity from deformed nuclei is usually well reproduced using the particle-rotor model in strong coupling limit. Recent attempts to go beyond adiabatic approximation, by addition of Coriolis interaction, have failed reproducing experimental results. We show that correct treatment pairing residual interaction nonadiabatic method permits recover good agreement with data.
Using the fusion-evaporation reaction ^{96}Ru(^{58}Ni,p4n)^{149}Lu and MARA vacuum-mode recoil separator, a new proton-emitting isotope ^{149}Lu has been identified. The measured decay Q value of 1920(20) keV is highest for ground-state proton decay, it naturally leads to shortest directly half-life 450_{-100}^{+170} ns emitter. rate consistent with l_{p}=5 emission, suggesting dominant πh_{11/2} component wave function state. Through nonadiabatic quasiparticle calculations was concluded...
The eigenstates of a Woods-Saxon axially deformed potential are calculated by solving the corresponding coupled channel Schr\"odinger equation with outgoing boundary condition at large distances, thus providing both bound states and resonances. level energies conditions for to become narrow resonances, vice versa, investigated as function deformation. These studies may be important interpret future measurements nuclei close nucleon drip line.
The saturation curve of symmetric nuclear matter is calculated at the Brueckner-Hartree-Fock level approximation within continuous choice for single-particle potential. realistic local Argonne ${\mathit{v}}_{14}$ potential used and results are compared with similar calculations presented in literature. binding energies per nucleon around agree closely previous obtained separable versions same as well Paris
Proton emission from the drip line nucleus ${}_{63}^{131}\mathrm{Eu},$ to first excited ${2}^{+}$ state of daughter ${}_{62}^{130}\mathrm{Sm}$ is analyzed as decay a deformed nucleus, and half-lives are evaluated exactly. It found that Nilsson ${K=3/2}^{+}$ for deformation $0.34>\ensuremath{\beta}>0.27$ describes both fine structure ground ${}^{130}\mathrm{Sm}.$
The nonadiabatic quasiparticle model for triaxial shapes is used to perform calculations decay of 141Ho, the only known odd-Z even-N deformed nucleus which fine structure in proton emission from both ground and isomeric states was observed. All experimental data corresponding this unique case namely, rotational spectra parent daughter nuclei, widths branching ratios states, could be well explained with a strong deformation γ∼20°. recent observation state, can an assignment I=3/2+ as decaying...
In this Letter, the observation of two previously unknown isotopes is presented for first time: Rb72 with 14 observed events and Zr77 one event. From nonobservation less proton-rich nucleus Rb73, we derive an upper limit ground-state half-life 81 ns, consistent previous 30 ns. For Rb72, have measured a 103(22) This relatively long-lived odd-odd nucleus, exotic odd-even neighbor, being unbound shows diffuseness proton drip line possibility sandbanks to exist beyond it. The 5+→5/2− decay...
With a proper formalism for proton emission from triaxially deformed nuclei, we perform exact calculations of decay widths the decays to ground and first excited ${2}^{+}$ states in daughter nucleus. Our results rotational spectrum, width fine structure case nucleus $^{145}\mathrm{Tm}$ lead time an accurate identification triaxial deformation using emission. This work also puts evidence advantage over conventional probes study nuclear at drip-line.
The dependence of the half-lives for proton emission from deformed nuclei is studied different single particle potentials known in literature, that describe standard nuclear structure properties. As an example, ground state and isomeric decays ${}^{131}\mathrm{Eu}$ ${}^{141}\mathrm{Ho}$ will be considered, since they are well exotic which experimental data very precise. In order to reproduce decay rates properties decaying nuclei, interactions must have spin-orbit term treated as a large...
Neutron and proton Gamow resonances are evaluated in $^{208}\mathrm{Pb}$ they used together with bound states as single-particle representation to calculate random phase approximation particle-hole excitations. A good account of the escape width corresponding giant is obtained.
Proton emission from deformed nuclei near the drip line is regarded as a versatile tool in nuclear structure physics and such study odd-odd provides us with an excellent opportunity to understand several interesting features including interaction between valence proton neutron. We present detailed formalism for full microscopic calculation of emitters, where decay aspects are taken into account exactly. This based on nonadiabatic approach two quasiparticle plus rotor model, residual...
Gamma rays from excited states feeding a proton-emitting isomeric-state in $^{151}\mathrm{Lu}$ have been observed for the first time. Comparison with state-of-the-art nonadiabatic quasiparticle calculations indicates an oblately deformed, $3/{2}^{+}$ state quadrupole deformation of ${\ensuremath{\beta}}_{2}=\ensuremath{-}0.11$. The suggest increase deformation, to ${\ensuremath{\beta}}_{2}=\ensuremath{-}0.18$, increasing spin which is understood terms mixing Nilsson at Fermi surface. It also...