- Associate Professor, PhD, Born in Pleven, Bulgaria, Head of the Nuclear Theory Laboratory of the Institute for Nuclea... moreAssociate Professor, PhD, Born in Pleven, Bulgaria, Head of the Nuclear Theory Laboratory of the Institute for Nuclear Research and Nuclear Energy (Sofia, Bulgaria), Expertise in Nuclear Theory (Structure and Reactions)edit
ABSTRACT A successful, simultaneous reproduction of density and momentum distributions in 4He is presented in a method accounting for nucleon correlations using only two functions (1s and 1d) and totally three parameters, while in the... more
ABSTRACT A successful, simultaneous reproduction of density and momentum distributions in 4He is presented in a method accounting for nucleon correlations using only two functions (1s and 1d) and totally three parameters, while in the best fit of equal quality known to us there are 12 parameters. Further, a physical interpretation of the 1d state involved is given as coming from an internal rotation of nucleons. Such an interpretation provides a hint that the neutron skin and neutron halo in exotic nuclei could have a rotational origin.
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ABSTRACT The symmetry energy, the neutron pressure and the asymmetric compressibility of deformed neutron-rich even-even nuclei are calculated on the examples of Kr and Sm isotopes within the coherent density fluctuation model using the... more
ABSTRACT The symmetry energy, the neutron pressure and the asymmetric compressibility of deformed neutron-rich even-even nuclei are calculated on the examples of Kr and Sm isotopes within the coherent density fluctuation model using the symmetry energy as a function of density within the Brueckner energy-density functional. The correlation between the thickness of the neutron skin and the characteristics related with the density dependence of the nuclear symmetry energy is investigated for isotopic chains of these nuclei in the framework of the self-consistent Skyrme-Hartree-Fock plus BCS method. Results for an extended chain of Pb isotopes are also presented. A remarkable difference is found in the trend followed by the different isotopic chains: the studied correlations reveal a smoother behavior in the Pb case than in the other cases. We also notice that the neutron skin thickness obtained for $^{208}$Pb with SLy4 force is found to be in a good agreement with recent data.
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ABSTRACT An approach to the generator coordinate method (GCM) using Skyrme-type effective forces and three construction potentials is applied to study main characteristics of the ground and, in particular, the first excited monopole state... more
ABSTRACT An approach to the generator coordinate method (GCM) using Skyrme-type effective forces and three construction potentials is applied to study main characteristics of the ground and, in particular, the first excited monopole state in the 4 He, 16 O and 40 Ca nuclei. The calculated single-particle overlap functions are applied for a consistent description of data from (e,e ' p), (γ,p) and (p,d) reactions on 40 Ca on the same theoretical footing.
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ABSTRACT Overlap functions and spectroscopic factors extracted from a model one-body density matrix (OBDM) accounting for short-range nucleon - nucleon correlations are used to calculate differential cross sections of (p, d) reactions and... more
ABSTRACT Overlap functions and spectroscopic factors extracted from a model one-body density matrix (OBDM) accounting for short-range nucleon - nucleon correlations are used to calculate differential cross sections of (p, d) reactions and the momentum distributions of transitions to single-particle states in and . A comparison between the experimental (p, d) and data, their DWBA and CDWIA analyses and the OBDM calculations is made. Our theoretical predictions for the spectroscopic factors are compared with the empirically extracted ones. It is shown that the overlap functions obtained within the Jastrow correlation method are applicable to the description of the quantities considered.
ABSTRACT A successful reproduction of the charge density distribution and the deep central depression in the point-proton density distribution of is presented using only two functions (1s and 1d) and totally three parameters. This d... more
ABSTRACT A successful reproduction of the charge density distribution and the deep central depression in the point-proton density distribution of is presented using only two functions (1s and 1d) and totally three parameters. This d particle-state wavefunction is furthermore related to the d-state admixture earlier reported for .
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A microscopic analysis of the optical potentials (OPs) and cross sections of elastic scattering of 8 B on 12 C, 58 Ni, and 208 Pb targets at energies 20 < E < 170 MeV is carried out. The real part of the OP is calculated by a... more
A microscopic analysis of the optical potentials (OPs) and cross sections of elastic scattering of 8 B on 12 C, 58 Ni, and 208 Pb targets at energies 20 < E < 170 MeV is carried out. The real part of the OP is calculated by a folding procedure and the imaginary part is obtained on the base of the high-energy approximation (HEA). The density distributions of 8 B obtained within the variational Monte Carlo (VMC) model and the three-cluster model (3CM) are used to construct the potentials. In the hybrid model, the only free parameters are the depths of the real and imaginary parts of OP obtained by fitting the experimental data. The use of HEA to estimate the imaginary OP at energies just above the Coulomb barrier is discussed. The analysis of the behavior of 3CM and VMC densities and the corresponding OPs in comparison with the fitted Woods-Saxon OP gives additional information on the decisive role of the nuclear surface on the elastic scattering mechanism in the particular exam...
East European Journal of Physics Structure properties of neutron-rich exotic nuclei Energetic characteristics of the surface electromagnetic wave at plasma-plasma interface in magnetic field Comparative kinetics of ions for different modes of parametric instability of intense Langmuir waves in pl...more
EEJP is an international peer-reviewed journal devoted to experimental and theoretical research on the nuclear physics, cosmic rays and particles, high-energy physics, solid state physics, plasma physics, physics of charged particle... more
EEJP is an international peer-reviewed journal devoted to experimental and theoretical research on the nuclear physics, cosmic rays and particles, high-energy physics, solid state physics, plasma physics, physics of charged particle beams, plasma electronics, radiation materials science, physics of thin films, condensed matter physics, functional materials and coatings, medical physics and physical technologies in an interdisciplinary context. Published quarterly in hard copy and online by Karazin Kharkiv national University Publishing. The editorial policy is to maintain the quality of published papers at the highest level by strict peer review.
A microscopic approach to calculate the optical potential (OP) with the real part obtained by a folding procedure and with the imaginary part inherent in the high-energy approximation (HEA) is applied to study the 6,8He+p elastic... more
A microscopic approach to calculate the optical potential (OP) with the real part obtained by a folding procedure and with the imaginary part inherent in the high-energy approximation (HEA) is applied to study the 6,8He+p elastic scattering data at energies of tens of MeV/N. The OP's and the cross sections are calculated using different models for the neutron and proton densities of 6,8He. The role of the spin-orbit (SO) potential and effects of the energy and density dependence of the effective NN forces are studied. Comparison of the calculations with the available experimental data on the elastic scattering differential cross sections at beam energies <100 MeV/N is performed and conclusions on the role of the aforesaid effects are made. It is shown that the present approach, which uses only parameters that renormalize the depths of the OP, can be applied along with other methods like that from the microscopic g-matrix description of the complex proton optical potential.
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Research Interests: Physics and Exotic Nuclei
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ABSTRACT A microscopic approach to calculate the optical potential (OP) with the real part obtained by a folding procedure and with the imaginary part inherent in the high-energy approximation is applied to study the 8He+p elastic... more
ABSTRACT A microscopic approach to calculate the optical potential (OP) with the real part obtained by a folding procedure and with the imaginary part inherent in the high-energy approximation is applied to study the 8He+p elastic scattering at energies of tens of MeV/nucleon (MeV/N). The OP&#39;s and the cross sections are calculated using different models for the neutron and proton densities of 8He. The role of the spin-orbit potential is studied. Comparison of the calculations with the available experimental data on the elastic scattering differential cross sections at beam energies of 15.7, 26, 32, 66 and 73 MeV/N is performed. The problem of the ambiguities of the depths of each component of the optical potential is considered by means of the imposed physical criterion related to the known behavior of the volume integrals as functions of the incident energy. It is shown also that the role of the surface absorption is rather important, in particular for the lowest incident energies (e.g., 15.7 and 26 MeV/N). The present approach, which uses only parameters that renormalize the depths of the OP, can be applied along with other methods using microscopically calculated optical potentials.
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We investigate the temperature dependence of the volume and surface components of the nuclear symmetry energy (NSE) and their ratio in the framework of the local density approximation. The results of these quantities for finite nuclei are... more
We investigate the temperature dependence of the volume and surface components of the nuclear symmetry energy (NSE) and their ratio in the framework of the local density approximation. The results of these quantities for finite nuclei are obtained within the coherent density fluctuation model (CDFM). The CDFM weight function is obtained using the temperature-dependent proton and neutron densities calculated through the HFBTHO code that solves the nuclear Skyrme-Hartree-Fock-Bogoliubov problem by using the cylindrical transformed deformed harmonic-oscillator basis. We present and discuss the values of the volume and surface contributions to the NSE and their ratio obtained for the Ni, Sn, and Pb isotopic chains around double-magic 78Ni, 132Sn, and 208Pb nuclei. The results for the T-dependence of the considered quantities are compared with estimations made previously for zero temperature showing the behavior of the NSE components and their ratio, as well as with the available experim...
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Abstract. The microscopic model of optical potential (OP) is applied f or calculations of theBe+C elastic scattering cross sections at energies 679 MeV and 796 MeV. The real part of the OP is constructed within the d ouble folding model... more
Abstract. The microscopic model of optical potential (OP) is applied f or calculations of theBe+C elastic scattering cross sections at energies 679 MeV and 796 MeV. The real part of the OP is constructed within the d ouble folding model with the exchange part including while the imaginary p art is based on the high-energy approximation theory. The OP depends on the nuc l ar density distributions ofBe and thus, their models are tested in our study. The differe ntial cross sections are calculated with the help of the compu ter code DWUCK4, in which the effect of the inelastic channel contribution is taken into account. The breakup reaction Be+C→Be+2n+C is also discussed.
A successful analytical formula for the proton momentum distribution in all nuclei with A>4 accounting for nucleon-nucleon correlation effects, is presented. In this formula the Isomorphic Shell Model wave functions are employed, which... more
A successful analytical formula for the proton momentum distribution in all nuclei with A>4 accounting for nucleon-nucleon correlation effects, is presented. In this formula the Isomorphic Shell Model wave functions are employed, which are readily available for all nuclei all the way up to 2 0 8Pb. However, other wave functions (e.g., shell model or Hartree-Fock) could be used with almost equivalent results. Available experimental data for 4He, 1 2C and 5 6Fe and predictions of other theories, e.g., for 4 0Ca, are used for comparison of the predictions of the present formula. A reservation is kept concerning the validity of this formula for the momentum distribution of exotic nuclei.
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The optical potential of 8He+p scattering is calculated using the folding model for its real part and the high-energy approximation for the imaginary part. On this basis, the experimental differential elastic scattering cross sections are... more
The optical potential of 8He+p scattering is calculated using the folding model for its real part and the high-energy approximation for the imaginary part. On this basis, the experimental differential elastic scattering cross sections are analyzed at energies below 100 MeV/nucleon. Conclusions are drawn on the applicability of the optical potential model and on the selection of an adequate model of the 8He nucleus structure.