268 citations · 3k across the 94 of their papers we have counts for
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Electric and Magnetic Moments and Transition Probabilities in Pb Nuclei
V. Tselyaev, N. Lyutorovich, J. Speth +3
We present moments and transition probabilities in the neighboring odd-mass nuclei of Pb calculated fully self-consistently from the s.p. properties of Pb with pola…
Self-consistent description of high-spin states in doubly magic Pb
N. Lyutorovich, V. Tselyaev, J. Speth +3
We analyze recent data on a long series of high-spin states in Pb with a self-consistent phonon-coupling model for nuclear excitations based on the Skyrme functionals. The…
M1 resonance in Pb within the self-consistent phonon-coupling model
V. Tselyaev, N. Lyutorovich, J. Speth +1
The main goal of the paper is to investigate theoretically the experimentally observed fragmentation of the isovector resonance in Pb within a self-consistent model ba…
Skyrme RPA for nuclear resonances: trouble with magnetic modes
J. Speth, P. -G. Reinhard, V. Tselyaev +1
We discuss major differences between electric and magnetic excitations in nuclei appearing in self-consistent calculation based on Skyrme energy-density functionals. Tools of analy…
Low-energy M1 excitations in Pb and the spin channel of the Skyrme energy-density functional
V. Tselyaev, N. Lyutorovich, J. Speth +2
We investigate the spin dependent part of the Skyrme energy-density functional, in particular its impact on the residual particle-hole interaction in self-consistent calculations o…
Excitation spectra of exotic nuclei in a self-consistent phonon-coupling model
N. Lyutorovich, V. Tselyaev, J. Speth +1
We explore giant resonance spectra and low-lying dipole strength in the Ni and Sn chains from proton rich to very neutron rich isotopes, relevant in astrophysical reaction chains.…
Self-consistency in the phonon space of the particle-phonon coupling model
V. Tselyaev, N. Lyutorovich, J. Speth +1
In the paper the non-linear generalization of the time blocking approximation (TBA) is presented. The TBA is one of the versions of the extended random-phase approximation (RPA) de…
Optimizing phonon space in the phonon-coupling model
V. Tselyaev, N. Lyutorovich, J. Speth +1
We present a new scheme to select the most relevant phonons in the phonon-coupling model, named here time-blocking approximation (TBA). The new criterion, based on the phonon-nucle…
Application of an Extended Random Phase Approximation on Giant Resonances in Light, Medium and Heavy Mass Nuclei
V. Tselyaev, N. Lyutorovich, J. Speth +2
We present results of the time blocking approximation (TBA) on giant resonances in light, medium and heavy mass nuclei. The TBA is an extension of the widely used random-phase appr…
The phonon-coupling model for Skyrme forces
N. Lyutorovich, V. Tselyaev, J. Speth +2
A short review on the self-consistent RPA based on a energy-density functional of the Skyrme type is given. We also present an extension of the RPA where the coupling of phonons to…
Landau-Migdal vs. Skyrme
J. Speth, S. Krewald, F. Grümmer +3
The magnitude and density-dependence of the non-spin dependent Landau-Migdal parameters are derived from Skyrme energy functionals and compared with the phenomenological ones. We p…
Phonon coupling effects in magnetic moments of magic and semi-magic nuclei
E. E. Saperstein, O. Achakovskiy, S. Kamerdzhiev +3
Phonon coupling (PC) corrections to magnetic moments of odd neighbors of magic and semi-magic nuclei are analyzed within the self-consistent Theory of Finite Fermi Systems (TFFS) b…
Migdal and his theory in Jülich
J. Speth, F. Grümmer, S. Krewald
We review the application of Migdal's "Theory of Finite Fermi System" to the structure of deformed nuclei, approaches beyond the conventional linear response, and microscopic calcu…
Self-consistent calculations of the electric giant dipole resonances in light and heavy mass nuclei
N. Lyutorovich, V. Tselyaev, J. Speth +3
While bulk properties of stable nuclei are successfully reproduced by mean-field theories employing effective interactions, the dependence of the centroid energy of the electric gi…
Calculations of the isoscalar giant monopole resonance within the self-consistent RPA and its extensions
V. Tselyaev, S. Krewald, E. Litvinova +1
The strength distributions of the isoscalar giant monopole resonance have been calculated in O, Ca, Zr, Sn, Sm, and Pb nuclei withi…
Description of the Giant Monopole Resonance in the Even-A Sn Isotopes within the Microscopic Model Including Quasiparticle-Phonon Coupling
A. Avdeenkov, F. Gruemmer, S. Kamerdzhiev +5
We have calculated the strength distributions of the giant monopole resonance in the even-A tin isotopes (A = 112-124) which were recently measured in inelastic -scattering. The…
Self-consistent calculations within the Green's function method including particle-phonon coupling and the single-particle continuum
N. Lyutorovich, J. Speth, A. Avdeenkov +4
The Green's function method in the \emph{Quasiparticle Time Blocking Approximation} is applied to nuclear excitations in Sn and Pb. The calculations are performed s…
Self-consistent calculations within the Extended Theory of Finite Fermi Systems
A. Avdeenkov, F. Gruemmer, S. Kamerdzhiev +3
The Extended Theory of Finite Fermi Systems(ETFFS) describes nuclear excitations considering phonons and pairing degrees of freedom, using experimental single particle energies and…
Extended Theory of Finite Fermi Systems: Application to the collective and non-collective E1 strength in Pb
V. Tselyaev, J. Speth, F. Gruemmer +4
The Extended Theory of Finite Fermi Systems is based on the conventional Landau-Migdal theory and includes the coupling to the low-lying phonons in a consistent way. The phonons gi…
Landau Migdal Theory of Interacting Fermi Systems: A Framework for Effective Theories in Nuclear Structure Physics
Frank Gruemmer, Josef Speth
We review Migdal's Theory of Finite Fermi Systems and its application to the structure of nuclei. The theory is an extension of Landau's Theory of Interacting Fermi Systems. In the…
Microscopic description of the pygmy and giant electric dipole resonances in stable Ca isotopes
G. Tertychny, V. Tselyaev, S. Kamerdzhiev +5
The properties of the pygmy (PDR) and giant dipole resonance (GDR)in the stable , and isotopes have been calculated within the \emph{Extended Theory of…
Extended Theory of Finite Fermi Systems (Collective Vibrations in Closed Shell Nuclei)
S. Kamerdzhiev, J. Speth, G. Tertychny
We review an extension of Migdal's Theory of Finite Fermi Systems which has been developed and applied to collective vibrations in closed shell nuclei in the past ten years. This m…
Pion-nucleon scattering in a meson-exchange model
A. M. Gasparyan, J. Haidenbauer, C. Hanhart +1
The pi-N interaction is studied within a meson-exchange model and in a coupled-channels approach which includes the channels pi-N, eta-N, as well as three effective pi-pi-N channel…
Angular asymmetries in the reactions pp \to dπ^+ηand pn \to dπ^0ηand a_0-f_0 mixing
A. E. Kudryavtsev, V. E. Tarasov, J. Haidenbauer +2
The reactions pp\to dπ^+ηand pn\to dπ^0ηare of special interest for investigating the a_0(980) (J^P=0^+) resonance in the process NN \to da_0 \to dπη. We study some aspects of thos…