203 citations · 1.4k across the 56 of their papers we have counts for
40 papers · 1 filter
Doorway States in the Random-Phase Approximation
A. De Pace, A. Molinari, H. A. Weidenmueller
By coupling a doorway state to a see of random background states, we develop the theory of doorway states in the framework of the random-phase approximation (RPA). Because of the s…
Scaling properties of the pairing problem in the strong coupling limit
M. B. Barbaro, R. Cenni, A. Molinari +1
We study the excited states of the pairing Hamiltonian providing an expansion for their energy in the strong coupling limit. To assess the role of the pairing interaction we apply…
Spreading Widths of Doorway States
A. De Pace, A. Molinari, H. A. Weidenmueller
As a function of energy E, the average strength function S(E) of a doorway state is commonly assumed to be Lorentzian in shape and characterized by two parameters, the peak energy…
Fermion propagators in space-time
M. B. Barbaro, D. Berardo, R. Cenni +2
The one- and the two-particle propagators for an infinite non-interacting Fermi system are studied as functions of space-time coordinates. Their behaviour at the origin and in the…
Nuclear effects in electron reactions and their impact on neutrino processes
M. B. Barbaro, J. E. Amaro, J. A. Caballero +4
We suggest that superscaling in electroweak interactions with nuclei, namely the observation that the reduced electron-nucleus cross sections are to a large degree independent of t…
A simple model for NN correlations in quasielastic lepton-nucleus scattering
M. B. Barbaro, R. Cenni, T. W. Donnelly +1
We present a covariant extension of the relativistic Fermi gas model which incorporates correlation effects in nuclei. Within this model, inspired by the BCS descriptions of system…
A Model for BCS-Type Correlations in Superscaling
M. B. Barbaro, R. Cenni, T. W. Donnelly +1
Using ideas from BCS descriptions of systems of fermions, a covariant extension of the relativistic Fermi gas model is presented as a way to incorporate correlation effects in nucl…
Interaction of Regular and Chaotic States
A. De Pace, A. Molinari, H. A. Weidenmueller
Modelling the chaotic states in terms of the Gaussian Orthogonal Ensemble of random matrices (GOE), we investigate the interaction of the GOE with regular bound states. The eigenva…
Nuclear Masses, Chaos, and the Residual Interaction
A. Molinari, H. A. Weidenmuller
We interpret the discrepancy between semiempirical nuclear mass formulas and actual nuclear masses in terms of the residual interaction. We show that correlations exist among all b…
Superscaling and Charge-changing Neutrino Cross Sections
M. B. Barbaro, J. E. Amaro, J. A. Caballero +3
The superscaling function extracted from inclusive electron scattering data is used to predict high energy charge-changing neutrino cross sections in the quasi-elastic and regi…
Electroweak quasielastic response functions in nuclear matter
M. B. Barbaro, A. De Pace, T. W. Donnelly +1
Quasielastic electromagnetic and parity-violating electron scattering response functions of relativistic nuclear matter are reviewed. The roles played by the Hartree-Fock field and…
Spontaneous symmetry breaking and response functions
A. Beraudo, A. De Pace, M. Martini +1
We study the quantum phase transition occurring in an infinite homogeneous system of spin 1/2 fermions in a non-relativistic context. As an example we consider neutrons interacting…
Using Electron Scattering Superscaling to predict Charge-changing Neutrino Cross Sections in Nuclei
J. E. Amaro, M. B. Barbaro, J. A. Caballero +3
Superscaling analyses of few-GeV inclusive electron scattering from nuclei are extended to include not only quasielastic processes, but now also into the region where -excitatio…
Statistical fluctuations of ground-state energies and binding energies in nuclei
A. Molinari, H. A. Weidenmueller
The statistical fluctuations of the ground-state energy and of the binding energy of nuclei are investigated using both perturbation theory and supersymmetry. The fluctuations are…
Mean field at finite temperature and symmetry breaking
A. Beraudo, A. De Pace, M. Martini +1
For an infinite system of nucleons interacting through a central spin-isospin schematic force we discuss how the Hartree-Fock theory at finite temperature T yields back, in the T=0…
The many levels pairing Hamiltonian for two pairs
M. B. Barbaro, R. Cenni, A. Molinari +1
We address the problem of two pairs of fermions living on an arbitrary number of single particle levels of a potential well (mean field) and interacting through a pairing force. Th…
The Goldstone bosons in the pairing Hamiltonian: the path integral approach
M. B. Barbaro, A. Molinari, F. Palumbo +1
As a first step to derive the IBM from a microscopic nuclear hamiltonian, we bosonize the pairing hamiltonian in the framework of the path integral formalism respecting both the pa…
Nuclear response functions for the N-N*(1440) transition
L. Alvarez-Ruso, M. B. Barbaro, T. W. Donnelly +1
Parity-conserving and -violating response functions are computed for the inclusive electroexcitation of the N*(1440)(Roper) resonance in nuclear matter modeled as a relativistic Fe…
Delta-isobar relativistic meson exchange currents in quasielastic electron scattering
J. E. Amaro, M. B. Barbaro, J. A. Caballero +2
We study the role of the -isobar current on the response functions for high energy inclusive quasielastic electron scattering from nuclei. We consider a general Lagrangian which…
On the analytic solution of the pairing problem: one pair in many levels
M. Barbaro, R. Cenni, A. Molinari +1
We search for approximate, but analytic solutions of the pairing problem for one pair of nucleons in many levels of a potential well. For the collective energy a general formula, i…
Momentum distribution of relativistic nuclei with Hartree-Fock mesonic correlations
J. E. Amaro, M. B. Barbaro, J. A. Caballero +2
The impact of Hartree-Fock correlations on the nuclear momentum distribution is studied in a fully relativistic one boson exchange model. Hartree-Fock equations are exactly solved…
Revisiting the Hugenholtz-Van Hove theorem in nuclear matter
P. Czerski, A. De Pace, A. Molinari
An assessment of the magnitude of the rearrangement contribution to the Fermi energy and to the binding energy per particle is carried out in symmetric nuclear matter by extending…
Gauge and Lorentz invariant one-pion exchange currents in electron scattering from a relativistic Fermi gas
J. E. Amaro, M. B. Barbaro, J. A. Caballero +2
A consistent analysis of relativistic pionic correlations and meson-exchange currents for electroweak quasielastic electron scattering from nuclei is carried out. Fully-relativisti…
Statistical theory of the many-body nuclear system
A. De Pace, A. Molinari
A recently proposed statistical theory of the mean fields associated with the ground and excited collective states of a generic many-body system is extended by increasing the dimen…