Publications (42)49.22 Total impact

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ABSTRACT: The density distributions of $^{10}\mathrm{Be}$ and $^{11}\mathrm{Be}$ nuclei obtained within the quantum Monte Carlo model and the generator coordinate method are used to calculate the microscopic optical potentials (OPs) and cross sections of elastic scattering of these nuclei on protons and $^{12}\mathrm{C}$ at energies $E<100$ MeV/nucleon. The real part of the OP is calculated using the folding model with the exchange terms included, while the imaginary part of the OP that reproduces the phase of scattering is obtained in the highenergy approximation. In this hybrid model of OP the free parameters are the depths of the real and imaginary parts obtained by fitting the experimental data. The wellknown energy dependence of the volume integrals is used as a physical constraint to resolve the ambiguities of the parameter values. The role of the spinorbit potential and the surface contribution to the OP is studied for an adequate description of available experimental elastic scattering crosssection data. Also, the cluster model, in which $^{11}\mathrm{Be}$ consists of a $n$halo and the $^{10}\mathrm{Be}$ core, is adopted. Within the latter, the breakup cross sections of $^{11}\mathrm{Be}$ nucleus on $^{9}\mathrm{Be},^{93}\mathrm{Nb},^{181}\mathrm{Ta}$, and $^{238}\mathrm{U}$ targets and momentum distributions of $^{10}\mathrm{Be}$ fragments are calculated and compared with the existing experimental data.  [Show abstract] [Hide abstract]
ABSTRACT: The density distributions of $^{10}$Be and $^{11}$Be nuclei obtained within the quantum Monte Carlo (QMC) model and the generator coordinate method (GCM) are used to calculate the microscopic optical potentials (OPs) and cross sections of elastic scattering of these nuclei on protons and $^{12}$C at energies $E<100$ MeV/nucleon. The real part of the OP is calculated using the folding model with the exchange terms included, while the imaginary part of the OP that reproduces the phase of scattering is obtained in the highenergy approximation (HEA). In this hybrid model of OP the free parameters are the depths of the real and imaginary parts obtained by fitting the experimental data. The well known energy dependence of the volume integrals is used as a physical constraint to resolve the ambiguities of the parameter values. The role of the spinorbit potential and the surface contribution to the OP is studied for an adequate description of available experimental elastic scattering cross section data. Also, the cluster model, in which $^{11}$Be consists of a $n$halo and the $^{10}$Be core, is adopted. Within the latter, the breakup cross sections of $^{11}$Be nucleus on $^{9}$Be, $^{93}$Nb, $^{181}$Ta, and $^{238}$U targets and momentum distributions of $^{10}$Be fragments are calculated and compared with the existing experimental data.  [Show abstract] [Hide abstract]
ABSTRACT: The density distributions of 10,11Be nuclei obtained via the generator coordinate method (GCM) and quantum Monte Carlo (QMC) model are used to calculate the microscopic optical potentials (OP) and elastic scattering cross sections of these nuclei on protons and the 12C nucleus. The real part of the OP is obtained by means of folding while the imaginary part is estimated within a highenergy approximation. The depths of the real and imaginary parts of OP are varied by fitting these calculations to experimental data on cross sections. The known energy dependence of the respective volume integrals of potentials is used to resolve ambiguities in magnitudes of these depths. These OPs can be applied to the further calculations of the cross sections of different reactions in which they take part.  [Show abstract] [Hide abstract]
ABSTRACT: Theoretical analysis of the elastic scattering and breakup in interactions of the 11Li nucleus with protons are presented. The hybrid model of the microscopic optical potential (OP) is applied. The OP includes the singlefolding real part, while its imaginary part is derived within the highenergy approximation (HEA) theory. The spinorbit contribution to the OP is also included. The differential cross sections of 11Li+p elastic scattering and the total reaction cross sections are calculated at energies of 62, 68.4, and 75 MeV/nucleon and are compared with the available experimental data. The breakup cross sections at 62 MeV/nucleon and the momentum distributions of the fragments using a two cluster model of the 11 Li nucleus are obtained. An analysis of the singleparticle density of 11Li is performed.  [Show abstract] [Hide abstract]
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 singlefolding real part, while its imaginary part is derived within the highenergy approximation theory. For ^{11}Li+p elastic scattering, the microscopic largescale 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 spinorbit potential is studied and predictions for the total reaction cross sections are made. Also, the cluster model, in which ^{11}Li consists of a 2nhalo and the ^{9}Li core having its own LSSM form of density, is adopted. The respective microscopic protoncluster 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 singleparticle density of ^{11}Li within the same cluster model accounting for the possible geometric forms of the halocluster density distribution is performed.  [Show abstract] [Hide abstract]
ABSTRACT: A microscopic optical model analysis of the 11 Li+p elastic scattering data at incident energies of 62, 68.4, and 75 MeV/nucleon has been performed utilizing the microscopic optical potentials derived by a singlefolding procedure and also by using those inherent in the highenergy approximation. The calculated optical potentials are based on the microscopically calculated neutron and proton density distributions within the largescale shell model for 11 Li. The depths of the real and imaginary parts of the microscopic optical potentials are considered as fitting parameters in relation to the behavior of the volume integrals as functions of the incident energy. The role of the spinorbit potential is studied and estimations of the total cross sections are made. 
Dataset: NIMPR 637 60 20111
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ABSTRACT: The data of elastic scattering of 6,8He and 11Li on protons and 6He on 12C at beam energies less than 100 MeV/nucleon (MeV/N) are analyzed utilizing microscopic optical potentials obtained by a single (double)folding procedure and also by using those inherent in the highenergy approximation. The calculated real and imaginary parts of the optical potentials are based on the neutron and proton density distributions of He and Li isotopes obtained within the largescale shellmodel (LSSM) method. The depths of the real and imaginary parts of the microscopic optical potentials are considered as fitting parameters using as a constrain the behavior of the volume integrals as functions of the incident energy. The 11Li breakup effect on 11Li+p elastic scattering at energy of 62 MeV/N is analyzed within a cluster model for 11Li with 9Li and 2n fragments. Predictions for the longitudinal momentum distribution of 9Li fragments produced in the breakup of 11Li on a proton target are given. The role of the spinorbit and "surface" terms of the optical potential is also studied and estimations of the total cross sections within the both LSSM and breakup reaction model are made.  [Show abstract] [Hide abstract]
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 spinorbit interaction is studied, and the total reaction cross sections that are proposed to be measured in future experiments are calculated.  [Show abstract] [Hide abstract]
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 doublefolding procedure and also those inherent in the highenergy GlauberSitenko 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.  [Show abstract] [Hide abstract]
ABSTRACT: Natural orbitals obtained within the coherent density fluctuation model and containing nucleon correlation effects are used to calculate characteristics of the Anucleon system, such as the electron elastic magnetic scattering form factors. The calculations are performed for nuclei with a doublyclosed 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 shellmodel singleparticle wave functions are used.  [Show abstract] [Hide abstract]
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. 
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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.  [Show abstract] [Hide abstract]
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 doublefolding procedure and also by using those inherent in the highenergy 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.  [Show abstract] [Hide abstract]
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 highenergy 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 spinorbit 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.  [Show abstract] [Hide abstract]
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 highenergy approximation is applied to study the He8+p elasticscattering 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 spinorbit potential is studied. Comparison of the calculations with the available experimental data on the elasticscattering 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).  [Show abstract] [Hide abstract]
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 highenergy 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 spinorbit (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 
Article: Calculations of 8He + p elastic scattering cross sections using the microscopic optical potential
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ABSTRACT: The optical potential of 8He+p scattering is calculated using the folding model for its real part and the highenergy 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.
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286  Citations  
49.22  Total Impact Points  
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Institutions

20002015

Bulgarian Academy of Sciences
 Institute for Nuclear Research and Nuclear Energy (INRNE)
Ulpia Serdica, SofiaCapital, Bulgaria


19982014

Joint Institute for Nuclear Research
Dubno, MO, Russia


2011

Varna University of Management
Khadzhioglu Pazardzhik, Dobrich, Bulgaria


2008

Kyushu University
Hukuoka, Fukuoka, Japan


20022004

Institute for Nuclear Research and Nuclear Energy
Ulpia Serdica, SofiaCapital, Bulgaria
