D. N. Kadrev

Bulgarian Academy of Sciences, Ulpia Serdica, Sofia-Capital, Bulgaria

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Publications (29)48.27 Total impact

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    ABSTRACT: In the paper, the results of analysis of elastic scattering and breakup processes in interactions of the ^{11}Li nucleus with protons are presented. The hybrid model of the microscopic optical potential (OP) is applied. This OP includes the single-folding real part, while its imaginary part is derived within the high-energy approximation theory. For ^{11}Li+p elastic scattering, the microscopic large-scale shell model (LSSM) density of ^{11}Li is used. The depths of the real and imaginary parts of the OP are fitted to the elastic scattering data at 62, 68.4, and 75 MeV/nucleon, being simultaneously adjusted to reproduce the true energy dependence of the corresponding volume integrals. The role of the spin-orbit potential is studied and predictions for the total reaction cross sections are made. Also, the cluster model, in which ^{11}Li consists of a 2n-halo and the ^{9}Li core having its own LSSM form of density, is adopted. The respective microscopic proton-cluster OPs are calculated and folded with the density probability of the relative motion of both clusters to get the whole ^{11}Li+p OP. The breakup cross sections of ^{11}Li at 62 MeV/nucleon and momentum distributions of the cluster fragments are calculated. An analysis of the single-particle density of ^{11}Li within the same cluster model accounting for the possible geometric forms of the halo-cluster density distribution is performed.
    Physical Review C 09/2013; 88(3). · 3.72 Impact Factor
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    ABSTRACT: Amicroscopic optical potential is used to calculate cross sections for elastic {sup 11}Li +p scattering at the energies of 62, 68.4, and 75 MeV per nucleon, and the results are compared with available experimental data. The potential used does not involve free parameters, but the depths of its real and imaginary parts are renormalized. The known trend in the energy dependence of the volume integrals of the optical potential is taken into account in analyzing experimental data. The role of spin-orbit interaction is studied, and the total reaction cross sections that are proposed to be measured in future experiments are calculated.
    Physics of Atomic Nuclei 11/2012; 75(11). · 0.54 Impact Factor
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    ABSTRACT: Natural orbitals obtained within the coherent density fluctuation model and containing nucleon correlation effects are used to calculate characteristics of the A-nucleon system, such as the electron elastic magnetic scattering form factors. The calculations are performed for nuclei with a doubly-closed core and a valence nucleon in a stretched configuration (j=l+1/2), such as the 17O and 41Ca nuclei. It is shown that the calculations of the transverse form factor using natural orbitals improve the agreement with the experimental data in comparison with the case when shell-model single-particle wave functions are used.
    International Journal of Modern Physics E 01/2012; 05(04). · 0.63 Impact Factor
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    ABSTRACT: Theoretical analysis is made for the 6He+12C elastic scattering data at three different beam energies. The breakup effect of the 6He at higher energies is also studied. Calculations were performed using microscopic optical potentials (OP's) obtained by a double-folding procedure and also those inherent in the high-energy Glauber-Sitenko approximation. The problem of ambiguity of the adjusted depths of these potentials is resolved. The role of breakup processes in formation of the imaginary potential in elastic channel is also discussed.
    Journal of Physics Conference Series 01/2012; 366(1).
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    ABSTRACT: The electron–ion scattering experiment ELISe is part of the installations envisaged at the new experimental storage ring at the International Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany. It offers an unique opportunity to use electrons as probe in investigations of the structure of exotic nuclei. The conceptual design and the scientific challenges of ELISe are presented.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 05/2011; 637(1):60-76. · 1.14 Impact Factor
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    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 05/2011; 637(1):60–76. · 1.14 Impact Factor
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    ABSTRACT: The 6He + 12C elastic scattering at E = 3.0, 38.3, and 41.6 MeV/nucleon is analyzed using the microscopic model of optical potential. According to this approach, two or three parameters are fitted that renormalize the depth of real, imaginary, and surface parts of the calculated optical potential. In this case, the ambiguity of the obtained sets of fitting parameters remains, but can be reduced by introducing an additional criterion of selection: the dependence of the volume integrals of the optical potential on the energy. The structure of the obtained optical potential, the role of the nuclear medium, the formation of the imaginary part of the optical potential, and the interconnection between the surface potential and the 6He breakup channels are discussed.
    Bulletin of the Russian Academy of Sciences Physics 01/2011; 75(4):495-499.
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    ABSTRACT: The electron-ion scattering experiment ELISe is part of the installations envisaged at the new experimental storage ring at the international Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany.It offers an unique opportunity to use electrons as probe ininvestigations of the structure of exotic nuclei. The conceptual design and the scientific challenges of ELISe are presented.
    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 01/2011; · 1.14 Impact Factor
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    ABSTRACT: The $^6$He+$^{12}$C elastic scattering data at beam energies of 3, 38.3 and 41.6 MeV/nucleon are studied utilizing the microscopic optical potentials obtained by a double-folding procedure and also by using those inherent in the high-energy approximation. The calculated optical potentials are based on the neutron and proton density distributions of colliding nuclei established in an appropriate model for $^6$He and obtained from the electron scattering form factors for $^{12}$C. The depths of the real and imaginary parts of the microscopic optical potentials are considered as fitting parameters. At low energy the volume optical potentials reproduce sufficiently well the experimental data. At higher energies, generally, additional surface terms having form of a derivative of the imaginary part of the microscopic optical potential are needed. The problem of ambiguity of adjusted optical potentials is resolved requiring the respective volume integrals to obey the determined dependence on the collision energy. Estimations of the Pauli blocking effects on the optical potentials and cross sections are also given and discussed. Conclusions on the role of the aforesaid effects and on the mechanism of the considered processes are made. Comment: 12 pages, 9 figures, accepted for publication in Physical Review C
    07/2010;
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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 scattering at energies of tens of MeV/nucleon (MeV/N). The OP'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.
    Journal of Physics Conference Series 02/2010; 205(1):012032.
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    ABSTRACT: The He6+C12 elastic scattering data at beam energies of 3,38.3, and 41.6 MeV/nucleon are studied utilizing the microscopic optical potentials obtained by a double-folding procedure and also by using those inherent in the high-energy approximation. The calculated optical potentials are based on the neutron and proton density distributions of colliding nuclei established in an appropriate model for He6 and obtained from the electron scattering form factors for C12. The depths of the real and imaginary parts of the microscopic optical potentials are considered as fitting parameters. At low energy the volume optical potentials reproduce sufficiently well the experimental data. At higher energies, generally, additional surface terms having the form of a derivative of the imaginary part of the microscopic optical potential are needed. The problem of ambiguity of adjusted optical potentials is resolved requiring the respective volume integrals to obey the determined dependence on the collision energy. Estimations of the Pauli blocking effects on the optical potentials and cross sections are also given and discussed. Conclusions on the role of the aforesaid effects and on the mechanism of the considered processes are made.
    Physical Review C 01/2010; 82(2). · 3.72 Impact Factor
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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 (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
    08/2009;
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    ABSTRACT: 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.
    Bulletin of the Russian Academy of Sciences Physics 07/2009; 73(6):840-844.
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    ABSTRACT: An approach to calculate microscopic optical potential 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 He8+p elastic-scattering data at energies of tens of MeV/nucleon. The neutron and proton density distributions obtained in different models for He8 are used in the calculations of the differential cross sections. 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, 26.25, 32, 66, and 73 MeV/nucleon 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 26.25 MeV/nucleon).
    Physical Review C 01/2009; 80(2). · 3.72 Impact Factor
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    ABSTRACT: Results of charge form factors calculations for several unstable neutron-rich isotopes of light, medium and heavy nuclei (He, Li, Ni, Kr, Sn) are presented and compared to those of stable isotopes in the same isotopic chain. For the lighter isotopes (He and Li) the proton and neutron densities are obtained within a microscopic large-scale shell-model (LSSM), while for heavier ones Ni, Kr and Sn the densities are calculated in deformed self-consistent mean-fleld Skyrme HF+BCS method. We also compare proton densities to matter densities together with their rms radii and difiuseness parameter values. Whenever possible comparison of form factors, densities and rms radii with available experimental data is also performed. Calculations of form factors are carried out both in plane wave Born approximation (PWBA) and in distorted wave Born approximation (DWBA). These form factors are suggested as predictions for the future experiments on the electron-radioactive beam colliders where the efiect of the neutron halo or skin on the proton distributions in exotic nuclei is planned to be studied and thereby the various theoretical models of exotic nuclei will be tested.
    01/2006;
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    ABSTRACT: Results of charge form factors calculations for several unstable neutron-rich isotopes of light, medium and heavy nuclei (He, Li, Ni, Kr, Sn) are presented and compared to those of stable isotopes in the same isotopic chain. For the lighter isotopes (He and Li) the proton and neutron densities are obtained within a microscopic large-scale shell-model, while for heavier ones Ni, Kr and Sn the densities are calculated in deformed self-consistent mean-field Skyrme HF+BCS method. We also compare proton densities to matter densities together with their rms radii and diffuseness parameter values. Whenever possible comparison of form factors, densities and rms radii with available experimental data is also performed. Calculations of form factors are carried out both in plane wave Born approximation (PWBA) and in distorted wave Born approximation (DWBA). These form factors are suggested as predictions for the future experiments on the electron-radioactive beam colliders where the effect of the neutron halo or skin on the proton distributions in exotic nuclei is planned to be studied and thereby the various theoretical models of exotic nuclei will be tested. Comment: 26 pages, 11 figures, 3 tables, accepted for publication in Phys. Rev. C
    Physical Review C 06/2005; · 3.72 Impact Factor
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    ABSTRACT: The scaling functions $f(\psi')$ and $F(y)$ from the $\psi'$- and $y$-scaling analyses of inclusive electron scattering from nuclei are explored within the coherent density fluctuation model (CDFM). In addition to the CDFM formulation in which the local density distribution is used, we introduce a new equivalent formulation of the CDFM based on the one-body nucleon momentum distribution (NMD). Special attention is paid to the different ways in which the excitation energy of the residual system is taken into account in $y$- and $\psi'$-scaling. Both functions, $f(\psi')$ and $F(y)$, are calculated using different NMD's and are compared with the experimental data for a wide range of nuclei. The good description of the data for $y < 0$ and $\psi' < 0$ (including $\psi'< -1$) makes it possible to show the sensitivity of the calculated scaling functions to the peculiarities of the NMD's in different regions of momenta. It is concluded that the existing data on the $\psi'$- and $y$-scaling are informative for the NMD's at momenta not larger than $2.0 \div 2.5$ fm$^{-1}$. The CDFM allows us to study simultaneously on the same footing the role of both basic quantities, the momentum and density distributions, for the description of scaling and superscaling phenomena in nuclei. Comment: 26 pages, 4 figures
    Physical Review C 11/2004; 71:014317. · 3.72 Impact Factor
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    ABSTRACT: A completely antisymmetrized Green’s function approach to the inclusive quasielastic (e, e′) scattering, including a realistic one-body density, is presented. The single-particle Green’s function is expanded in terms of the eigenfunctions of the non-hermitian optical potential. This allows one to treat final state interactions consistently in the inclusive and in the exclusive reactions. Nuclear correlations are included in the one-body density. Numerical results for the response functions of 16O and 40Ca are presented and discussed.
    Annals of Physics 10/2004; · 3.32 Impact Factor
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    ABSTRACT: We construct a scaling function $f(\psi^{\prime})$ for inclusive electron scattering from nuclei within the Coherent Density Fluctuation Model (CDFM). The latter is a natural extension to finite nuclei of the Relativistic Fermi Gas (RFG) model within which the scaling variable $\psi^{\prime}$ was introduced by Donnelly and collaborators. The calculations show that the high-momentum components of the nucleon momentum distribution in the CDFM and their similarity for different nuclei lead to quantitative description of the superscaling in nuclei. The results are in good agreement with the experimental data for different transfer momenta showing superscaling for negative values of $\psi^{\prime}$, including those smaller than -1. Comment: 16 pages, 5 figures, submitted for publication to Phys. Rev. C
    Physical Review C 02/2004; 69:044321. · 3.72 Impact Factor

Publication Stats

152 Citations
48.27 Total Impact Points

Institutions

  • 2000–2013
    • Bulgarian Academy of Sciences
      • Institute for Nuclear Research and Nuclear Energy (INRNE)
      Ulpia Serdica, Sofia-Capital, Bulgaria
  • 2004
    • INFN - Istituto Nazionale di Fisica Nucleare
      Frascati, Latium, Italy
  • 2002–2004
    • Institute for Nuclear Research and Nuclear Energy
      Ulpia Serdica, Sofia-Capital, Bulgaria