A5060525059- Nuclear physics research studies
- Quantum chaos and dynamical systems
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Chromodynamics and Particle Interactions
- Rare-earth and actinide compounds
- Quantum, superfluid, helium dynamics
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Particle accelerators and beam dynamics
- Atomic and Molecular Physics
- International Science and Diplomacy
- Superconducting Materials and Applications
- Molecular Spectroscopy and Structure
- Physics of Superconductivity and Magnetism
- Cold Fusion and Nuclear Reactions
- Gyrotron and Vacuum Electronics Research
- Magnetic Properties of Alloys
- Magnetic confinement fusion research
- Scientific Research and Discoveries
- Nuclear reactor physics and engineering
- Astro and Planetary Science
- Nuclear Issues and Defense
- Biofield Effects and Biophysics
- Advanced Algebra and Geometry
- Spectral Theory in Mathematical Physics
Joint Institute for Nuclear Research
2013-2023
Dubna State University
1996
Institute for Nuclear Research
1994
With the Wigner function moments (WFM) method scissors mode of actinides and rare earth nuclei are investigated. The unexplained experimental fact that in $^{232}\mathrm{Th}$ a double hump structure is found finds natural explanation within WFM. It predicted lower peak corresponds to an isovector spin whereas higher-lying states conventional orbital mode. situation scrutinized this respect concerning practically all results $M1$ excitations.
The coupled dynamics of low-lying modes and various giant resonances are studied with the help Wigner function moments method on basis time-dependent Hartree-Fock equations in harmonic oscillator model including spin-orbit potential plus quadrupole-quadrupole spin-spin residual interactions. New spin-dependent analyzed. Special attention is paid to spin scissors mode.
Nuclear scissors modes are considered in the frame of Wigner-function moments method generalized to take into account spin degrees freedom and pair correlations simultaneously. A new source nuclear magnetism, connected with counter rotation spins up down around symmetry axis (hidden angular momenta), is discovered. Its inclusion theory allows one improve substantially agreement experimental data description energies transition probabilities rare-earth nuclei.
The dynamic equations are obtained for the moments of Wigner function (density matrix) in phase space a nucleon. rules closure set these formulated. negative-parity vibrational states (octupole, magnetic quadrupole and isoscalar dipole toroidal) analysed. theory gives an adequate description all excitations using as input values nuclear radius (R=r0A13/, r0=1.2 fm) surface tension (T=17/4 pi r02 MeV fm-2).
Energies and excitation probabilities of compressional vortical collective 1- states are calculated in the frame time-dependent Hartree-Fock theory. The method Wigner function moments is used to find solutions an equation for a density matrix. Good agreement with experiment obtained low-energy isoscalar dipole resonance 208Pb. toroidal predicted.
The fine structure of the scissors mode is investigated within time dependent Hartree-Fock-Bogoliubov (TDHFB) approach. solution TDHFB equations by Wigner function moments (WFM) method predicts a splitting into three intermingled branches. Together with conventional two new modes arise due to spin degrees freedom. They generate significant $M1$ strength below energy range. results calculations resonances in rare earths and actinides WFM quasiparticle-phonon nuclear model methods are compared...
The solution of TDHFB equations by Wigner Function Moments method with the isovectorisoscalar coupling taken into account leads to prediction new type nuclear spin scissors mode. It turns out that lower group M1 excitations in 164 Dy, which is usually not included systematics mode, can be quite naturally attributed this scissors.
A new type of nuclear collective motion - the spin scissors mode was predicted seven years ago. Promising signs its existence in 232 Th were found. We perform a systematic analysis experimental data on M1 excitations rare-earth nuclei to find traces this area. Obvious are demonstrated.