A5052962479- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum chaos and dynamical systems
- Quantum, superfluid, helium dynamics
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Physics of Superconductivity and Magnetism
- Quantum Mechanics and Non-Hermitian Physics
- Radioactive Decay and Measurement Techniques
- High-pressure geophysics and materials
- Fullerene Chemistry and Applications
- Rare-earth and actinide compounds
- Inorganic Fluorides and Related Compounds
- Superconducting Materials and Applications
- Mathematics and Applications
- Molecular spectroscopy and chirality
- Cold Fusion and Nuclear Reactions
- Molecular Spectroscopy and Structure
- Quantum many-body systems
University of Padua
2016-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Padova
2015-2025
Istituto Nazionale di Fisica Nucleare
2005-2024
Institute for Physics
2020
Osservatorio Astronomico di Padova
2019
Universidad de Sevilla
2008-2016
European Centre for Theoretical Studies in Nuclear Physics and Related Areas
2010-2011
National Institute for Astrophysics
2003-2010
Istituto Nazionale di Fisica Nucleare, Galileo Galilei Institute for Theoretical Physics
2003-2009
Vlaamse Vereniging voor Obstetrie en Gynaecolo
2006
Giant resonances are collective excitation modes for many-body systems of fermions governed by a mean field, such as the atomic nuclei. The microscopic origin is coherence among elementary particle-hole excitations, where particle promoted from an occupied state below Fermi level (hole) to empty one above (particle). same also predicted particle-particle and hole-hole because basic quantum symmetry between particles holes. In nuclear physics, giant have been widely reported sector but,...
An analytical solution of the collective Bohr equation with a Coulomb-like and Kratzer-like γ-unstable potential in quadrupole deformation space is presented. Eigenvalues eigenfunctions are given closed form transition rates calculated for two cases. The corresponding SO(2, 1) × SO(5) algebraic structure discussed.
Accurate measurements of nuclear reactions astrophysical interest within, or close to, the Gamow peak, show evidence an unexpected effect attributed to presence atomic electrons in target. The experiments need include effective "screening" potential explain enhancement cross sections at lowest measurable energies. Despite various theoretical studies conducted over past 20 years and numerous experimental measurements, a theory has not yet been found that can cause exceedingly high values...
We review and discuss several recent approaches to quadrupole collectivity developments of collective models their solutions with many applications, examples references. focus in particular on analytic approximate the Bohr hamiltonian last decade, because most previously published material has been already reviewed other publications.
New analytic solutions of the quadrupole collective Bohr hamiltonian are proposed, exploiting an approximate separation β and γ variables to describe γ-soft prolate axial rotors.The model potential is a sum two terms: β-dependent term taken either with Coulomb-like or Kratzer-like form, γ-dependent as harmonic oscillator.In particular it possible give one parameter paradigm for β-soft, rotor that can be applied, considerable agreement, spectrum 234 U.
A solution of the Bohr collective Hamiltonian for $\ensuremath{\beta}$-soft, $\ensuremath{\gamma}$-soft triaxial rotor with $\ensuremath{\gamma}\ensuremath{\sim}\ensuremath{\pi}∕6$ is presented making use a harmonic potential in $\ensuremath{\gamma}$ and Coulomb-like Kratzer-like potentials $\ensuremath{\beta}$. It shown that, while $\ensuremath{\gamma}$-angular part present case gives rise to straightforward extension rigid energy which an additive term appears, inclusion...
The Bohr-Mottelson model is solved for a generic soft triaxial nucleus, separating the Bohr hamiltonian exactly and using number of different model-potentials: displaced harmonic oscillator in $γ$, which with an approximated algebraic technique, Coulomb/Kratzer, harmonic/Davidson infinite square well potentials $β$, are exactly. In each case we derive analytic expressions eigenenergies then used to calculate energy spectra. Here study chain osmium isotopes compare our results experimental...
Charged reaction products originated from the interaction of loosely bound radioactive ion beam $^{17}\mathrm{F}$ (${S}_{p}=600$ keV) with proton-shell closed $^{58}\mathrm{Ni}$ target were measured at two colliding energies slightly above Coulomb barrier. The collected data analyzed within framework optical model to deduce cross section and investigate role played by inelastic excitations, transfer channels, breakup process ${}^{17}\mathrm{F}\ensuremath{\rightarrow}{}^{16}\mathrm{O}+p$...
An extension of the Interacting Boson Model that includes cubic ${(\stackrel{\ifmmode \hat{}\else \^{}\fi{}}{Q}\ifmmode\times\else\texttimes\fi{}\stackrel{\ifmmode \^{}\fi{}}{Q})}^{(0)}$ term is proposed. The potential energy surface for quadrupole interaction explicitly calculated within coherent state formalism using complete ($\ensuremath{\chi}\ensuremath{-}$dependent) expression operator. $Q$-cubic found to depend on asymmetry deformation parameter $\ensuremath{\gamma}$ as a linear...
Background: The $^{29}\mathrm{F}$ system is located at the lower-$N$ boundary of ``island inversion'' and an exotic, weakly bound system. Little known about this beyond its two-neutron separation energy (${S}_{2n}$) with large uncertainties. A similar situation found for low-lying spectrum unbound binary subsystem $^{28}\mathrm{F}$.Purpose: We investigate configuration mixing, matter radius, neutron-neutron correlations in ground-state within a three-body model, exploring possibility to be...
The neutron-rich $^{28,29}$F isotopes have been recently studied via knockout and interaction cross-section measurements. $2n$ halo in $^{29}$F has linked to the occupancy of $pf$ intruder configurations. We investigate bound continuum states $^{29}$F, focusing on $E1$ response low-lying excitations effect dipole couplings nuclear reactions. $^{29}\text{F}$ ($^{27}\text{F}+n+n$) wave functions are built within hyperspherical harmonics formalism, reaction cross sections calculated using...
The phase transition around the critical point in evolution from spherical to deformed \ensuremath{\gamma}-unstable shapes is investigated odd nuclei within interacting boson fermion model. We consider particular case of an $j=3/2$ particle coupled even-even core that undergoes a U(5) O(6) situation. choice orbital preserves condition \ensuremath{\gamma}-instability system. As consequence, energy spectrum and electromagnetic transitions, correspondence point, display behaviors qualitatively...
The ground state (g.s.) and low-lying continuum states of $^{6}\mathrm{He}$ are found within a shell model scheme, in basis two-particle built out $p$ the unbound $^{5}\mathrm{He}$ nucleus, using simple pairing contact-delta interaction. This accounts for Borromean character bound state, revealing its composition. We investigate quadrupole response system we put our calculations into perspective with latest experimental results. calculated strength distribution reproduces narrow ${2}^{+}$...
We investigate the selectivity of different two-particle transfer reactions [($t,p$), ($^{18}\mathrm{O}$,$^{16}\mathrm{O}$), and ($^{14}\mathrm{C}$,$^{12}\mathrm{C}$)] with respect to detailed microscopic configuration in initial final target states. In particular relative magnitude cross sections associated processes which pair is transferred pure single-particle orbitals depends on specific reaction its kinematical conditions. As a consequence also enhancement factors due pairing...
The exotic, neutron-rich and weakly-bound isotope $^{29}$F stands out as a waymarker on the southern shore of island inversion, portion nuclear chart where effects forces lead to reshuffling single particle levels reorganization structure far from stability. This nucleus has become very popular, new measurements allow refine theoretical models. We review latest developments suggest how further assess by proposing predictions electromagnetic transitions that experiments Relativistic Coulomb...
In the light of renewed interest in experiments on two-particle transfer reactions, we study evolution spectroscopic intensities as a possible signature shape-phase transitions. The is carried out considering chains even-even nuclei displaying changes shape, such from sphericity to axial-symmetric deformed or \ensuremath{\gamma}-unstable nuclei. structure these described terms interacting boson model. correspondence critical points characterizing phase transitions, ground-to-ground matrix...
We investigate the phase transition in odd nuclei within Interacting Boson Fermion Model correspondence with from spherical to stable axially deformed shape. The particle is assumed be moving single-particle orbitals angular momenta $j=1/2,3/2,5/2$ a boson-fermion Hamiltonian that leads occurrence of ${\mathrm{SU}}^{\mathit{BF}}(3)$ symmetry when boson part approaches SU(3) condition. Both energy spectra and electromagnetic transitions show characteristic patterns similar those displayed by...
Shape phase transitions in odd-$A$ nuclei are investigated within the framework of interacting boson-fermion model. The case a single $j=9/2$ fermion coupled to an even-even boson core is considered. This transits from spherical $\ensuremath{\gamma}$-unstable shapes depending on value control parameter Hamiltonian. effect coupling odd particle this along shape transition and, particular, at critical point discussed. For that purpose, ground-state energy surface terms $\ensuremath{\beta}$ and...
An approximate solution at the critical point of pairing transition from harmonic vibration to deformed rotation in gauge space is found by analytic collective Hamiltonian. The eigenvalues are expressed terms zeros Bessel functions integer order. results compared bands based on Pb isotopes.