A5084010698- Nuclear physics research studies
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Rare-earth and actinide compounds
- Pulsars and Gravitational Waves Research
- Quantum Chromodynamics and Particle Interactions
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Nonlinear Photonic Systems
- Scientific Research and Discoveries
- Nuclear reactor physics and engineering
- Quantum, superfluid, helium dynamics
- Astro and Planetary Science
- Radioactive element chemistry and processing
- Nonlinear Waves and Solitons
- Distributed and Parallel Computing Systems
- Gamma-ray bursts and supernovae
- Advanced Mathematical Physics Problems
- Astronomical and nuclear sciences
- Model Reduction and Neural Networks
- Geophysics and Gravity Measurements
- Neural Networks and Applications
- Geomagnetism and Paleomagnetism Studies
- Advanced NMR Techniques and Applications
New Bulgarian University
2015-2024
Varna Free University
2024
The Institute for Advanced Physics
2022
Joint Institute for Nuclear Research
2003-2017
Institute for Nuclear Research and Nuclear Energy
2003
In this contribution it is explored whether $\ensuremath{\gamma}$-ray spectroscopy following $\ensuremath{\beta}$ decay with high $Q$ values from mother nuclei low ground-state spin can be exploited as a probe for the pygmy dipole resonance. The suitability of approach demonstrated by comparison between data photon scattering, $^{136}\mathrm{Xe}(\ensuremath{\gamma},{\ensuremath{\gamma}}^{\ensuremath{'}})$, and $^{136}\mathrm{I}$...
It is well known that the Pauli principle plays a substantial role at low energies because quasiparticle and phonon operators, used to describe them, are built of fermions as consequence they not ideal bosons. The correct treatment this problem requires calculation exact commutators between operators in way take into account corrections. In addition correlations due interaction ground-state influence single-particle fragmentation well. article, we generalize basic equations...
Background: The coupling of the last nucleon with configurations in ground state even-even core is known to augment single quasiparticle fragmentation pattern. In a recent experimental study by Yordanov et al. values magnetic dipole and electric quadrupole moments $11/{2}^{\ensuremath{-}}$ long chain Cd isotopes were found follow simple trend which we try explain means incorporating long-range correlations state.Purpose: Our purpose influence ground-state (GSCs) on compare our results data...
The action of the long-range residual force on expectation value observables in nuclear ground states is evaluated by finding optimal values for coefficients canonical transformation which connects phonon vacuum state with (quasi)particle state. After estimating improvements over predictions independent-particle approximation we compare ground-state wave functions, obtained using presented approach, those conventional random phase (RPA) and its extended version. problem overbinding...
An enhanced model, based on the extended boson approximation, for lowest-lying states in odd-mass nuclei is presented. Our approach built quasiparticle phonon extending it to take into account ground-state correlations due action of Pauli principle more accurately than conventional theory. The derived interaction strengths between quasiparticles and phonons this model depend occupation numbers explicitly coupling nucleus equations with those even-even core. Within we calculated transition...
Abstract We outline the spectral properties of their Lax operators for Zakharov-Mikhailov spinor model (ZMm) and construct fundamental analytic solutions (FAS). Using dressing Zakahrov-Shabat method we derive factors one-soliton u 1 ( z , Φ ) 2 two-soliton solutions. Next calculate asymptotics → ±∞. Inserting them into find that ±∞ goes but with shifted center mass phase. Thus conclude 2-soliton interactions ZMm are purely elastic characterized by above mentioned shifts.
Abstract In this paper we approximate the wave function of Lipkin-Meshkov-Glick (LMG) model by a simple feed-forward neural network. By using NetKet toolkit obtain ground state energies LMG systems with different interaction strengths and find out that they are very close to exact values.
In this contribution, it is evaluated whether high Q-value β decays from mothers with low ground-state spin are suitable to probe the structure of 1− levels associated pygmy dipole response. A comparison data exemplary 136I →136Xe decay and 136Xe(γ,γ′) reaction reveals that some populated in both reactions but a different pattern. An investigation within microscopic quasiparticle phonon model shows pattern related population parts wave functions these establishing as novel probe.
Abstract We present a relation between the density and pressure of pure neutron matter derived from numerical calculations based on truncated coupled cluster model using simple bare nucleon-nucleon interaction in Minnesota potential form. The obtained relationship exhibits well-known behaviour only at low densities ≲ 0.08 fm −3 diverges supported by observations data equations state higher densities. Our results are compared with those efective feld theory realistic NN forces.
The action of the long-range residual force on expectation value observables in nuclear ground states is evaluated by finding optimal values for coefficients canonical transformation which connects phonon vacuum state with independent-particle ground-state using two-level Lipkin-Meshkov-Glick (LMG) model. After estimating improvements over predictions approximation we compare and first excited wave functions, obtained presented approach, those, conventional random phase (RPA) its extended...
In this note we present a concise overview of the quest nuclear theory community to propose and vindicate viable microscopic many-particle quantum which is capable explaining predicting great diversity recent data coming from observations neutron stars based on motions individual nucleons in stars. We dedicate special attention coupled-cluster method for matter calculations.
We show that GPU tensor cores can be a beneficial computational tool for solving coupled-cluster equations with double excitations in momentum space used to describe neutron matter. The conservation greatly reduces the number of non-zero matrix elements between two-neutron states system's potential energy forming blocks along main diagonal. If plane wave basis and neutrons are large enough produces sizes ≥ 103÷4 then VOLTA outperform respective CPU implementation by an order magnitude.