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## Publications

Publications (119)

Background: In highly deformed nuclei, there is a noticeable coupling of the isoscalar giant monopole resonance (ISGMR) and the K = 0 component of the isoscalar giant quadrupole resonance (ISGQR), which results in a double peak structure of the isoscalar monopole (IS0) strength (a narrow low-energy deformation-induced peak and a main broad ISGMR pa...

Background: In highly deformed nuclei, there is a noticeable coupling of the Isoscalar Giant Monopole Resonance (ISGMR) and the K = 0 component of the Isoscalar Giant Quadrupole Resonance (ISGQR), which results in a double peak structure of the isoscalar monopole (IS0) strength (a narrow low-energy deformation-induced peak and a main broad ISGMR pa...

A low-energy magnetic dipole (M1) spin-scissors resonance (SSR) located just below the ordinary orbital scissors resonance (OSR) was recently predicted in deformed nuclei within the Wigner function moments (WFM) approach. We analyze this prediction using fully self-consistent Skyrme quasiparticle random phase approximation (QRPA) method. Skyrme for...

Background: Nuclei in the sd shell demonstrate a remarkable interplay of cluster and mean-field phenomena. The N=Z nuclei, such as Mg24 and Si28, have been the focus of the theoretical study of both phenomena in the past. A variety of different cluster structures in these nuclei are predicted, characterized by isoscalar dipole and monopole transiti...

A low-energy $M1(K=1)$ spin-scissors resonance (SSR) located just below the ordinary orbital scissors resonance (OSR) was recently predicted in deformed nuclei within the Wigner Function Moments (WFM) approach. We analyze this prediction using fully self-consistent Skyrme Quasiparticle Random Phase Approximation (QRPA) method. The Skyrme forces SkM...

>>Background: Inelastic proton scattering at energies of a few hundred MeV and very-forward scattering angles including 0◦ has been established as a tool for the study of electric-dipole strength distributions in nuclei. The present work reports a systematic investigation of the chain of stable even-mass Nd isotopes representing a transition from s...

Nuclei in the $sd$-shell demonstrate a remarkable interplay of cluster and mean-field phenomena. The $N=Z$ nuclei, such as $^{24}$Mg and $^{28}$Si, have been the focus of the theoretical study of both these phenomena in the past. The cluster and vortical mean-field phenomena can be probed by excitation of isoscalar monopole and dipole states in sca...

Background: Inelastic proton scattering at energies of a few hundred MeV and very-forward angles including $0^\circ$ has been established as a tool to study electric-dipole strength distributions in nuclei. The present work reports a systematic investigation of the chain of stable even-mass Nd isotopes representing a transition from spherical to qu...

Individual low-energy E1 toroidal and compressional states (TS and CS) produced by the convective nuclear current jc were recently predicted for Mg24 in the framework of quasiparticle random-phase approximation (QRPA) with Skyrme forces. In the present QRPA study with Skyrme parametrization SLy6, we explore in more detail properties of these states...

We analyze the relation between isoscalar toroidal modes and so-called pygmy dipole resonance (PDR), which both appear in the same region of low-energy dipole excitations. To this end, we use a theoretical description within the fully self-consistent Skyrme quasiparticle random-phase approximation (QRPA). Test cases are spherical nuclei 40, 48Ca, 5...

Individual low-energy E1 toroidal and compressional states (TS and CS) produced by the convective nuclear current $j_{\rm c}$ were recently predicted in $^{24}$Mg in the framework of quasiparticle random-pase-approximation (QRPA) model with Skyrme forces. In the present QRPA study with the Skyrme parametrization SLy6, we check how much these states...

We suggest a generalized method for elimination of spurious admixtures (SA) from intrinsic nuclear excitations described within the quasiparticle random-phase approximation (QRPA). Various kinds of SA corrections are treated at the same theoretical ground. The known corrections are well reproduced. As relevant cases, we consider subtraction of SA r...

We analyze the relation between isoscalar toroidal modes and so-called pygmy dipole resonance (PDR) which both appear in the same region of low-energy dipole excitations. To this end, we use a theoretical description within the fully self-consistent Skyrme quasiparticle random-phase approximation (QRPA). Test cases are spherical nuclei $^{40,48}$Ca...

We introduce an universal method for elimination of the spurious modes from the intrinsic nuclear excitations described in the framework of the Quasiparticle-Random-Phase-Approximation (QRPA). The method is suitable for any type of spurious admixtures. The efficiency of the method is demonstrated for the case of the Skyrme QRPA applied to the axial...

The existence of individual low-energy E1 toroidal and compression states (TS and CS) in $^{24}$Mg was predicted recently in the framework of quasiparticle random-phase-approximation (QRPA) model with Skyrme forces. It was shown that the strong axial deformation of $^{24}$Mg is crucial to downshift the toroidal strength to the low-energy region and...

E p = 200 MeV θ lab = 0 • Relativistic Coulomb excitation of the IVGDR Comparison with photo-absorption results Transition from spherical to deformed nuclei Proton inelastic scattering experiments at energy E p = 200 MeV and a spectrometer scattering angle of 0 • were performed on 144,146,148,150 Nd and 152 Sm exciting the IsoVector Giant Dipole Re...

The phenomenon of fine structure of the Isoscalar Giant Quadrupole Resonance (ISGQR) has been studied with high energy-resolution proton inelastic scattering at iThemba LABS in the chain of stable even-mass Nd isotopes covering the transition from spherical to deformed ground states. A wavelet analysis of the background-subtracted spectra in the de...

The low-energy dipole excitations in $^{24}$Mg are investigated within the Skyrme quasiparticle random-phase-approximation (QRPA) for axial nuclei. The calculations reveal a remarkable feature: the lowest dipole excitation in $^{24}$Mg (with $I^{\pi}K=1^-1$ and calculated energy 7.92 MeV) is a vortical toroidal state (TS) representing a specific vo...

The phenomenon of fine structure of the Isoscalar Giant Quadrupole Resonance (ISGQR) has been studied with high energy-resolution proton inelastic scattering at iThemba LABS in the chain of stable even-mass Nd isotopes covering the transition from spherical to deformed ground states. A wavelet analysis of the background-subtracted spectra in the de...

We investigate effects of pairing and of quadrupole deformation on two sorts of nuclear excitations,$\gamma$-vibrational $K^{\pi}=2^+$ states and dipole resonances (isovector dipole, pygmy, compression, toroidal). The analysis is performed within the quasiparticle random-phase approximation (QRPA) based on the Skyrme energy functional using the Sky...

Proton inelastic scattering experiments at energy E_p = 200 MeV and a spectrometer scattering angle of 0 degree were performed on 144,146,148,150Nd and 152Sm exciting the IsoVector Giant Dipole Resonance (IVGDR). Comparison with results from photo-absorption experiments reveals a shift of resonance maxima towards higher energies for vibrational and...

We review a recent progress in investigation of the isoscalar toroidal dipole resonance (TDR). A possible relation of the TDR and low-energy dipole excitations (also called a pygmy resonance) is analyzed. It is shown that the dipole strength in the pygmy region can be understood as a local manifestation of the collective vortical toroidalmotion at...

The deformation-induced splitting of isoscalar giant monopole resonance (ISGMR) is systematically analyzed in a wide range of masses covering medium, rare-earth, actinide, and superheavy axial deformed nuclei. The study is performed within the fully self-consistent quasiparticle random-phase-approximation (QRPA) method based on the Skyrme functiona...

The low-lying M1 strength of the open-shell nucleus 50 Cr has been studied with the method of nuclear resonance fluorescence up to 9.7 MeV using bremsstrahlung at the superconducting Darmstadt linear electron accelerator S-DALINAC and Compton backscattered photons at the High Intensity γ-ray Source (HIγ S) facility between 6 and 9.7 MeV of the init...

The lowest γ-vibrational states with Kπ = 2+γ in well-deformed Dy, Er and Yb isotopes are investigated within the self-consistent separable quasiparticle random-phase-approximation (QRPA) approach based on the Skyrme functional. The energies Eγ and reduced transition probabilities B(E2)γ of the states are calculated with the Skyrme force SV-mas10....

The low-lying M1 strength of the open-shell nucleus 50 Cr has been studied with the method of nuclear resonance fluorescence up to 9.7 MeV using bremsstrahlung at the superconducting Darmstadt linear electron accelerator S-DALINAC and Compton backscattered photons at the High Intensity γ-ray Source (HIγ S) facility between 6 and 9.7 MeV of the init...

The isoscalar giant monopole resonance (GMR) in spherical nuclei 100-132Sn, 144Sm and 208Pb is investigated within the Skyrme random-phase approximation for a variety of Skyrme forces and different pairing options. The calculated GMR strength functions are directly compared to the available experimental distributions. It is shown that, in accordanc...

The strong deformation splitting of the isoscalar giant monopole resonance
(ISGMR), recently observed in ($\alpha,\alpha'$) reaction in prolate $^{24}$Mg,
is analyzed in the framework of the Skyrme quasiparticle
random-phase-approximation (QRPA) approach with the Skyrme forces SkM*, SVbas
and SkP$^{\delta}$. The calculations with these forces give...

Random Phase Approximation (RPA) is the basic method for calculation of
excited states of nuclei over the Hartree-Fock ground state, suitable also for
energy density functionals (EDF or DFT). We developed a convenient formalism
for expressing densities and currents in a form of reduced matrix elements,
which allows fast calculation of spectra for s...

Background: Recent experiments on α-decay of odd-odd superheavy nuclei give important information on the structure of the low-lying states of these nuclei. For this reason, it is interesting to calculate the excitation spectra of superheavy nuclei in the framework of different approaches and compare the results with the experimental data. Purpose:...

The lowest quadrupole $\gamma$-vibrational $K^{\pi}=2^+$ states in axially
deformed rare-earth (Nd, Sm, Gd, Dy, Er, Yb, Hf, W) and actinide (U) nuclei are
systematically investigated within the fully self-consistent separable
random-phase-approximation (SRPA) based on the Skyrme functional. The energies
$E_{\gamma}$ and reduced transition probabili...

The isoscalar giant monopole resonance (GMR) in spherical nuclei
$^{100-132}$Sn, $^{144}$Sm, and $^{208}$Pb is investigated within the Skyrme
random-phase-approximation (RPA) for a variety of Skyrme forces and different
pairing options. The calculated GMR strength functions are directly compared to
the available experimental distributions. It is sh...

A possible relation of the low-lying E1 (pygmy resonance) and toroidal
strengths is analyzed by using Skyrme-RPA results for the strength functions,
transition densities and current fields in $^{208}$Pb. It is shown that the
irrotational pygmy motion can appear as a local manifestation of the collective
vortical toroidal dipole resonance (TDR) at t...

Two aspects of the transport of the repulsive Bose-Einstein condensate (BEC)
in a double-well trap are inspected: impact of the interatomic interaction and
analogy to the Josephson effect. The analysis employs a numerical solution of
3D time-dependent Gross-Pitaevskii equation for a total order parameter
covering all the trap. The population transf...

The isoscalar giant monopole resonance (GMR) in Samarium isotopes (from spherical 144Sm to deformed 148-154Sm) is investigated within the Skyrme random-phase- approximation (RPA) for a variety of Skyrme forces. The exact RPA and its separable version (SRPA) are used for spherical and deformed nuclei, respectively. Consistently with earlier investig...

Two basic concepts of nuclear vorticity, hydrodynamical (HD) and Rawenthall-Wambach (RW), are critically inspected. As a test case, we consider the interplay of irrotational and vortical motion in isoscalar electric dipole E1(T =0) modes in 208Pb, namely the toroidal and compression modes. The modes are described in a self-consistent random-phase a...

Two basic concepts of nuclear vorticity, hydrodynamical (HD) and
Rawenthall-Wambach (RW), are critically inspected. As a test case, we consider
the interplay of irrotational and vortical motion in isoscalar electric dipole
E1(T=0) modes in $^{208}$Pb, namely the toroidal and compression modes. The
modes are described in a self-consistent random-pha...

An inverse population transfer of the repulsive Bose-Einstein condensate
(BEC) in a weakly bound double-well trap is explored within the 3D
time-dependent Gross-Pitaevskii equation. The model avoids numerous common
approximations (two-mode treatment, time-space factorization, etc) and closely
follows the conditions of Heidelberg experiments, thus p...

The effect of nuclear deformation on the isoscalar toroidal and compression
dipole modes in prolate $^{170}$Yb is studied in the framework of the
random-phase-approximation method with a representative set of Skyrme forces
(SV-bas, SLy6, SkM$^*$ and SkI3). It is shown that the deformation crucially
redistributes the strength of both modes. The comp...

A comparative analysis of toroidal, compressional and vortical dipole
strengths in the spherical $^{144}$Sm and the deformed $^{154}$Sm is performed
within the random-phase-approximation using a set of different Skyrme forces.
Isoscalar (T=0), isovector (T=1), and electromagnetic excitation channels are
considered. The role of the nuclear convectio...

The nature of E1 low-energy strength (LES), often denoted as a "pygmy dipole
resonance", is analyzed within the random-phase-approximation (RPA) in
$^{208}$Pb using Skyrme forces in fully self-consistent manner. A first
overview is given by the strength functions for the dipole, compressional and
toroidal operators. More detailed insight is gained...

The toroidal, compression and vortical dipole strength functions in
semi-magic $^{124}$Sn (and partly in doubly-magic $^{100,132}$Sn) are analyzed
within the random-phase-approximation method with the SkT6, SkI3, SLy6, SV-bas,
and SkM* Skyrme forces. The isoscalar (T=0), isovector (T=1), and
electromagnetic ('elm') channels are considered. Both con...

Dynamics of the repulsive Bose-Einstein condensate (BEC) in a double-well
trap is explored within the 3D time-dependent Gross-Pitaevskii equation. The
model avoids numerous common approximations (two-mode treatment, time-space
factorization, fixed values of the chemical potential and barrier
penetrability, etc) and thus provides a realistic descrip...

The giant dipole resonance (GDR) in N = 28 isotones (48Ca,
50Ti, 52Cr, 54Fe) is analyzed in the
framework of the Skyrme random-phase-approximation (RPA). Three Skyrme
forces, SkM*, SLy6 and SV-bas, are used. The effects beyond RPA are
simulated by the double folding procedure. We show that dipole strength
exhibits a large collective shift, which te...

The giant dipole resonance (GDR) in deformed nuclei is analyzed using the self-consistent separable random-phase-approximation (SRPA) with Skyrme forces SkT6, SkM*, SLy6 and SkI3. The deformed nuclei 150Nd and 238U are used as representative rare-earth and actinide samples. Dependences of the dipole strength distributions on some basic characterist...

The multipole vortical, toroidal, and compression modes are analyzed.
Following the vorticity concept of Ravenhall and Wambach, the vortical operator
is derived and related in a simple way to the toroidal and compression
operators. The strength functions and velocity fields of the modes are analyzed
in $^{208}$Pb within the random-phase-approximati...

Some representative cases of the description and analysis of giant resonances within the self-consistent separable random-phase-approximation model (SRPA) based on the Skyrme functional are discussed. It is shown that SRPA with SLy6 force well describes the dipole giant resonance in rare-earth and actinide regions. The sensitivity of the E1 strengt...

Low-energy E1 strength in neutron-rich $^{132-164}$Sn isotopes is analyzed in
the framework of the Skyrme random phase approximation (RPA) with different
Skyrme forces. A double folding procedure is applied to take into account the
energy-dependent width effects beyond RPA. All the considered Skyrme forces
indicate a soft prolate deformation in the...

We present particular examples of tunneling and transport dynamics of Bose–Einstein condensate (BEC) in a two-well trap: Josephson oscillations (JO), macroscopic quantum self-trapping (MQST) and complete adiabatic transport. Being quite general, these dynamical regimes have close analogies with Josephson junctions in superconductors and transport p...

This contribution deals with the predictive power of the Skyrme-Hartree-Fock model. First, we discuss the phenomenological
adjustment of the Skyrme energy-functional and the choice of proper fit data. Then, we check the reliability in extrapolations
to other observables and nuclei, using two strategies: first, comparison with data for observables n...

We present a systematic analysis of the description of odd nuclei by the Skyrme-Hartree-Fock approach augmented with pairing in BCS approximation and blocking of the odd nucleon. Current and spin densities in the Skyrme functional produce time-odd mean fields (TOMF) for odd nuclei. Their effect on basic properties (binding energies, odd-even stagge...

Despite a great success of the Skyrme mean-field approach in exploration of
nuclear dynamics, it seems to fail in description of the spin-flip M1 giant
resonance. The results for different Skyrme parameterizations are contradictory
and poorly agree with experiment. In particular, there is no parameterization
which simultaneously describes the one-p...

A complete adiabatic transport of Bose–Einstein condensate (BEC) in a double-well trap is investigated within the mean field approximation. The transfer is driven by the time-dependent (Gaussian) coupling between the wells and their relative detuning. The protocol successfully works in a wide range of both repulsive and attractive BEC interaction....

The self-consistent separable random-phase approximation (SRPA) model with
Skyrme forces is extended to the case of magnetic excitations and applied to
the description of spin-flip and orbital M1 giant resonances in the isotopic
chain $^{142-152}$Nd. The Skyrme forces SkT6, SkM*, SLy6 and SkI3 are used. The
calculations show the onset of the scisso...

The spin-flip M1 giant resonance is explored in the framework of the random-phase-approximation (RPA) on the basis of the Skyrme energy functional. A representative set of eight Skyrme parametrizations (SkT6, SkM*, SLy6, SG2, SkO, SkO’, SkI4, and SV-bas) is used. Light and heavy, spherical and deformed nuclei (48Ca, 158Gd, 208Pb, and 238U) are cons...

The isovector dipole E1 strength in 92,94,96,98,100Mo is
analyzed within the self-consistent separable random-phase approximation
(SRPA) model with Skyrme forces SkT6, SkM*, SLy6, and SkI3. The special
attention is paid to the low-energy region near the particle thresholds
(4-12 MeV), which is important for understanding of astrophysical
processes....

A complete adiabatic transport of Bose-Einstein condensate in a double-well trap is investigated within the Landau-Zener (LZ),
and Gaussian Landau-Zener (GLZ) schemes for the case of a small non-linearity, when the atomic interaction is weaker than
the coupling. The schemes use the constant (LZ) and time-dependent Gaussian (GLZ) couplings. The mean...

Ability of the time-dependent density functional theory (TDDFT) with Skyrme forces to describe electric giant resonances (GR) is scrutinized within the self-consistent separable RPA (SRPA) method recently developed by our group. The isovector E1(T = 1) and isoscalar E2(T = 0) and E0(T = 0) GR are explored with different Skyrme forces. Both spherica...

The irreversible transport of multi-component Bose-Einstein condensate (BEC) is investigated within the Stimulated Adiabatic Raman Passage (STIRAP) scheme. A general formalism for a single BEC in M-well trap is derived and analogy between multi-photon and tunneling processes is demonstrated. STIRAP transport of BEC in a cyclic triple-well trap is e...

By using a close similarity between multi-photon and tunneling population transfer schemes, we propose robust adiabatic methods for the transport of Bose-Einstein condensate (BEC) in double- and triple-well traps. The calculations within the mean-field approximation (Gross-Pitaevskii equation) show that irreversible and complete transport takes pla...

The E1(T=1) isovector dipole giant resonance (GDR) in heavy and superheavy deformed nuclei is analyzed over a sample of 18 rare-earth nuclei, four actinides, and three chains of superheavy elements (Z=102, 114, and 120). The basis of the description is the self-consistent separable random-phase approximation (SRPA) using the Skyrme force SLy6. The...

We demonstrate that some populations transfer methods proposed for atoms and simple molecules can be successfully implemented for exploration of electronic spectra in light atomic clusters and transport of Bose-Einstein condensate.

The isovector giant dipole resonance (GDR) in deformed nuclei 154Sm and 238U is described within the self-consistent separable RPA (random-phase-approximation) with Skyrme forces SkT6, SkM*, SLy6 and SkI3. We examine dependence of the description on the Skyrme force and gross-structure effects, as well as influence of the Coulomb interaction, multi...