A5061513372- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Particle physics theoretical and experimental studies
- Rare-earth and actinide compounds
- Dark Matter and Cosmic Phenomena
- Crystallography and Radiation Phenomena
- Cold Fusion and Nuclear Reactions
- Radioactive Decay and Measurement Techniques
- Cosmology and Gravitation Theories
- Astro and Planetary Science
- Cold Atom Physics and Bose-Einstein Condensates
- High-Energy Particle Collisions Research
- Boron Compounds in Chemistry
- Liquid Crystal Research Advancements
- Geophysics and Sensor Technology
- Mathematical functions and polynomials
- Geometric and Algebraic Topology
- Radioactive element chemistry and processing
Maria Curie-Skłodowska University
2011-2025
Marie Curie
2025
Institute of Physics
2004-2015
University of Tennessee at Knoxville
2008-2013
Oak Ridge National Laboratory
2007-2013
Czech Academy of Sciences, Institute of Physics
1978
Lifetimes of super-heavy (SH) nuclei are primarily governed by alpha decay and spontaneous fission (SF). Here we study the competing modes even-even SH isotopes with 108 <= Z 126 148 N 188 using state-of-the-art self-consistent nuclear density functional theory framework capable describing competition between attraction electrostatic repulsion. The collective mass tensor fissioning superfluid nucleus is computed means cranking approximation to adiabatic time-dependent Hartree-Fock-Bogoliubov...
Our understanding of nuclear fission, a fundamental decay, is still incomplete due to the complexity process. In this paper, we describe study spontaneous fission using symmetry-unrestricted density functional theory. results show that observed bimodal can be explained in terms pathways multidimensional collective space corresponding different geometries products. We also predict new phenomenon trimodal for some rutherfordium, seaborgium, and hassium isotopes.
Broyden's method, widely used in quantum chemistry electronic-structure calculations for the numerical solution of nonlinear equations many variables, is applied context nuclear many-body problem. Examples include unitary gas problem, density functional theory with Skyrme functionals, and coupled-cluster theory. The stability its ease use, rapid convergence rates make method a tool choice large-scale structure calculations.
Collective inertia is strongly influenced at the level crossing which quantum system changes diabatically its microscopic configuration. Pairing correlations tend to make large-amplitude nuclear collective motion more adiabatic by reducing effect of those configuration changes. Competition between pairing and thus expected have a profound impact on spontaneous fission lifetimes. To elucidate role nucleonic fission, we study dynamic trajectories $^{264}$Fm $^{240}$Pu using state-of-the-art...
The spontaneous fission lifetime of 264Fm has been studied within nuclear density functional theory by minimizing the collective action integral for in a two-dimensional quadrupole space representing elongation and triaxiality. potential inertia tensor are obtained self-consistently using Skyrme energy density-dependent pairing interaction. resulting lifetimes compared with static result minimum-energy pathway. We show that pathways strongly depend on assumptions underlying inertia. With...
A collective mass tensor derived from the cranking approximation to adiabatic time-dependent Hartree-Fock-Bogoliubov (ATDHFB) approach is compared with that obtained in Gaussian overlap (GOA) generator coordinate method. Illustrative calculations are carried out for one-dimensional quadrupole fission pathways ${}^{256}$Fm. It shown exhibits strong variations coordinate. These related changes intrinsic shell structure. The differences between inertia and perturbative approximations ATDHFB,...
The augmented Lagrangiam method (ALM), widely used in quantum chemistry constrained optimization problems, is applied the context of nuclear Density Functional Theory (DFT) self-consistent Skyrme Hartree-Fock-Bogoliubov (CHFB) variant. ALM allows precise calculations multidimensional energy surfaces space collective coordinates that are needed to, e.g., determine fission pathways and saddle points; it improves accuracy computed derivatives with respect to variables inertia; well adapted...
A systematic study of global properties superheavy nuclei in the framework macroscopic-microscopic method is performed. Equilibrium deformations, masses, quadrupole moments, radii, shell energies, fission barriers and half-lives are calculated using following macroscopic models: Myers-Swiatecki liquid drop, droplet, Yukawa-plus-exponential, Lublin-Strasbourg drop. Shell pairing energies Woods-Saxon potential with a universal set parameters. The analysis covers wide range even-even from...
We employ a realistic nuclear mean-field theory using the phenomenological, Woods-Saxon Hamiltonian with newly adjusted parameters containing no parametric correlations; originally present correlations are removed employing Monte Carlo approach. find very large neutron shell gaps at $N=136$ for all four octupole deformations ${\ensuremath{\alpha}}_{3\ensuremath{\mu}=0,1,2,3}$. These generate well-pronounced double potential-energy minima in standard multipole...
The quality of the description nuclear masses and charge radii, calculated in various microscopic approaches, is studied. Hartree-Fock-Bogoliubov (HFB), extended Thomas-Fermi model with Strutinski integral (ETFSI), relativistic mean field (RMF), macroscopic-microscopic (MM) approaches are considered. In HFB approximation, both finite-range (Gogny) zero-range (Skyrme) effective forces used. Spherical even-even nuclei (116 nuclides), from light $(A=16)$ to heavy $(A=220)$ ones, known...
Mean-field calculations in multidimensional deformation spaces are performed and the shape coexistence isomers generated by exotic nuclear configurations toroidal superdeformed ones addressed. We use a phenomenological mean-field Hamiltonian of Woods-Saxon type with its universal parametrization involving eight parameters fixed once for all full periodic table. Original parametric correlations existing this Hamiltonians removed using methods inverse problem theory applied mathematics....
We introduce the concept of nuclear octupole fourfold (i.e., applying simultaneously to all four deformations ${\ensuremath{\alpha}}_{30}$, ${\ensuremath{\alpha}}_{31}$, ${\ensuremath{\alpha}}_{32}$, and ${\ensuremath{\alpha}}_{33}$) neutron ``magic number'' $N=196$ discuss physical consequences its presence. Our theoretical predictions are obtained using realistic phenomenological mean-field approach with deformed Woods-Saxon potential, latter employing new parametrization optimized in our...
In two recent articles we have formulated nuclear mean-field theory predictions of existence a new form magic numbers, referred to as fourfold numbers. These stipulate the presence strong shell closures at neutron numbers $N=136$ (actinide region) and $N=196$ (superheavy simultaneously nonvanishing all four octupole deformations ${\ensuremath{\alpha}}_{3\ensuremath{\mu}=0,1,2,3}\ensuremath{\ne}0$. contrast traditional notion refers simultaneous nonspherical configurations...
The nuclear fission phenomenon is a magnificent example of quantal collective motion during which the nucleus evolves in multidimensional space representing shapes with different geometries. triaxial degrees freedom are usually important around inner barrier, and reduce barrier height by several MeV. Beyond reflection-asymmetric corresponding to asymmetric elongated fragments come into play. We discuss interplay between symmetry breaking mechanisms case even-even fermium isotopes using...
Spontaneous fission barriers, quadrupole inertia, and zero-point quadrupole-energy corrections are calculated for 252,256,258Fm in the framework of self-consistent Skyrme-Hartree-Fock+BCS theory. Two ways computing dynamical inertia employed: Gaussian Overlap Approximation to Generator Coordinate Method cranking ansatz. The Skyrme results compared with those Gogny-Hartree-Fock-Bogolyubov model.
The mean-square nuclear radii, quadrupole moments and deformation parameters of the proton neutron distributions are evaluated using mean-field Hamiltonians with Gogny Skyrme forces. results compared estimates obtained within relativistic theory experimental data. calculations were performed for a few sets forces wide range numbers Sr, Xe Ba isotopes. A significant difference was found in distributions, especially Sr