A. S. Zubov

Publications (13)6.6 Total impact

• Article: Quantum-mechanical description of the initial stage of fusion reaction

  V. V. Sargsyan, A.S. Zubov, Z. Kanokov, G. G. Adamian, N. V. Antonenko
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  ABSTRACT: Projectile-nucleus capture by a target nucleus at bombarding energies in the vicinity of the Coulomb barrier is treated on the basis of the reduced-density-matrix formalism. The effect of dissipation and fluctuations on the capture process is taken into account self-consistently within this model. Cross sections for evaporation-residue formation in asymmetric-fusion reactions are found by using the calculated capture probabilities averaged over all orientations of the deformed projectile or target nucleus.
  Physics of Atomic Nuclei 04/2012; 72(3):425-438. · 0.57 Impact Factor
• Article: Isotopic dependence of the cross section for the induced fission of heavy nuclei

  O. N. Bolgova, G. G. Adamian, N. V. Antonenko, A. S. Zubov, S. P. Ivanova, W. Scheid
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  ABSTRACT: The cross sections for the induced fission of 211−223Ra, 203−211Rn, and 221−231Th nuclei undergoing peripheral collisions with 208Pb nuclei are calculated on the basis of the statistical model. The role of the N = 126 neutron shell is studied. The level density in excited nuclei is determined within the Fermi gas model and a model that takes into account the collective enhancement of the level density. The inclusion of a particle—hole excitation in addition to a collective Coulomb excitation makes it possible to obtain a satisfactory description of experimental cross sections for the fission of radium isotopes. The calculated ratios of the cross sections for the induced fission of 236U (237U) and 238U (239U) nuclei agree with experimental data. PACS numbers25.70.Jj
  Physics of Atomic Nuclei 04/2012; 72(6):928-937. · 0.57 Impact Factor
• Article: Application of statistical methods for analysis of heavy-ion reactions in the framework of a dinuclear system model

  A. S. Zubov, G. G. Adamian, N. V. Antonenko
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  ABSTRACT: Heavy-ion reactions are investigated by statistical methods in the framework of a dinuclear system model (DNS). Synthesis of superheavy elements in cold and hot fusion reactions on Pb and Bi targets, as well as in incomplete fusion reactions, is considered. We also take a look at production of neutron-deficient isotopes and pre-scission neutron emission in quasifission reactions. The results of calculations are compared with the available experimental data. The sensitivity of these results to the method of calculation of the level density and to various theoretical predictions of nuclear properties is analyzed.
  Physics of Particles and Nuclei 04/2012; 40(6):847-889. · 0.52 Impact Factor
• Article: Population of ground-state rotational bands of superheavy nuclei produced in complete fusion reactions

  A. S. Zubov, V. V. Sargsyan, G. G. Adamian, N. V. Antonenko
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  ABSTRACT: Using the statistical and quantum diffusion approaches, we study the population of ground-state rotational bands of superheavy nuclei produced in the fusion-evaporation reactions 208Pb(48Ca,2n)254No, 206Pb(48Ca,2n)252No, and 204Hg(48Ca,2n)250Fm. By describing the relative intensities of E2 transitions between the rotational states, the entry spin distributions of residual nuclei, and the excitation functions for these reactions, the dependence of fission barriers of shell-stabilized nuclei on angular momentum is investigated.
  Phys. Rev. C. 10/2011; 84(4).
• Article: Production of exotic nuclei in quasifission-type reactions

  G G Adamian, N V Antonenko, V V Sargsyan, W Scheid, A S Zubov
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  ABSTRACT: The possibilities for producing neutron-rich isotopes 82,84,86Zn and 86,88,90,92Ge are demonstrated in the reactions 48Ca+238U, 244Pu at incident energies near the Coulomb barrier. The production cross sections of new neutron-rich isotopes of nuclei with charge numbers Z=64–80 are estimated as well. The dynamics of the binary reaction is considered as the diffusive multinucleon transfer between the interacting nuclei in the collisions when the excitation energy of the produced exotic isotope is lower than the threshold for the neutron emission. In the quasifission reactions 48Ca+244,246,248Cm at beam energies close to the corresponding Coulomb barriers one can produce new isotopes of superheavies with Z = 103–108, which mainly undergo fission.
  Journal of Physics Conference Series 03/2011; 282(1):012002.
• Article: Formation of hyperdeformed states in capture reactions at sub-barrier energies

  A. S. Zubov, V. V. Sargsyan, G. G. Adamian, N. V. Antonenko, W. Scheid
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  ABSTRACT: The high-spin hyperdeformed nuclear states treated as dinuclear or quasimolecular configurations are suggested to be directly populated in heavy ion collisions at sub-barrier energies. Tunneling through the Coulomb barrier is considered using the quantum diffusion approach based on the formalism of reduced density matrix. The reactions 48Ca+86Kr,124Sn,136Xe,138Ba,140Ce, 58Ni+58Ni, and 40,48Ca+40,48Ca, are suggested for populating high-spin hyperdeformed states. The partial production and identification cross sections for the hyperdeformed states are calculated as the functions of bombarding energy.
  Phys. Rev. C. 09/2010; 82(3).
• Article: Formation of hyperdeformed states by neutron emission from a dinuclear system

  A. S. Zubov, V. V. Sargsyan, G. G. Adamian, N. V. Antonenko, W. Scheid
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  ABSTRACT: The hyperdeformed nuclei treated as dinuclear or quasimolecular configurations are suggested to be directly produced in heavy-ion reactions at bombarding energies near the Coulomb barrier. The excited dinuclear system formed in the entrance channel of the heavy-ion collision can be cooled down by neutron emission to be transformed into the hyperdeformed nuclear system. This transition from the excited dinuclear system to a hyperdeformed configuration is described within the statistical approach. The reactions 48Ca+124,128,130,132,134Sn, 48Ca+136,138Xe, 48Ca+137,138,140Ba, 40Ca+83,84Kr, 48Ca+83,84,86Kr, 40,48Ca+40,48Ca, 58,60Ni+58,60Ni, and 40Ca+58Ni are suggested for the population of hyperdeformed states. The production cross sections, quadrupole moments, and moments of inertia of hyperdeformed states formed in these reactions are calculated, and the optimal conditions for the experimental identification of such states are proposed.
  Phys. Rev. C. 02/2010; 81(2).
• Article: Possibilities of production of neutron-deficient isotopes of U, Np, Pu, Am, Cm, and Cf in complete fusion reactions

  G. G. Adamian, N. V. Antonenko, W. Scheid, A. S. Zubov
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  ABSTRACT: Within the dinuclear system model we analyze the production of yet unknown neutron-deficient isotopes of U, Np, Pu, Am, Cm, and Cf in various complete fusion reactions. Different deexcitation channels of the excited compound nucleus are treated. The results are obtained without special adjustment to the selected evaporation channel. The fusion probability is an important ingredient of the excitation function. The results are in good agreement with the available experimental data. The alpha decay half-life times in the neutron-deficient actinides are discussed.
  Phys. Rev. C. 10/2008; 78(4).
• Article: Isotopic dependence of neutron emission from dinuclear system

  A. S. Zubov, G. G. Adamian, N. V. Antonenko, S. P. Ivanova, W. Scheid
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  ABSTRACT: Using the statistical approach, we study the isotopic dependence of the de-excitation of dinuclear systems formed in the entrance channel of heavy-ion reactions. The probabilities of neutron emission from the dinuclear systems 62-73Ni + 208Pb are estimated and a possible experiment for the observation of this emission is discussed.
  European Physical Journal A 07/2007; 33(2):223-230. · 2.19 Impact Factor
• Article: Production of unknown transactinides in asymmetry-exit-channel quasifission reactions

  G.G. Adamian, Tashkent Institute of Nuclear Physics, N. V. Antonenko, A. S. Zubov
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  ABSTRACT: Possibilities of production of new isotopes of superheavy nuclei with charge numbers 104-108 in asymmetry-exit-channel quasifission reactions are studied for the first time. The optimal conditions for the synthesis are suggested in this type of reaction. The products of suggested reactions can fill a gap of unknown isotopes between the isotopes of heaviest nuclei obtained in cold and hot complete fusion reactions.
  Physical Review. C, Nuclear Physics. 02/2005; 71(3).
• Article: Survival probabilities of superheavy nuclei based on recent predictions of nuclear properties

  A. S. Zubov, G. G. Adamian, N. V. Antonenko, S. P. Ivanova, W. Scheid
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  ABSTRACT: By using the statistical model and recent theoretical predictions of nuclear properties, survival probabilities of superheavy nuclei with respect to the xn evaporation channel ( x = 1-4) are calculated. Level densities of the Fermi-gas model and of a model with collective enhancement are used. The survival probabilities and the fusion cross-sections calculated within the dinuclear system model are applied to obtain excitation functions of No isotopes in the reactions 48Ca + 204, 206, 208Pb and production cross-sections of superheavy nuclei with Z > 102 in cold and hot fusion reactions. The results are in a good agreement with available experimental data.
  European Physical Journal A 01/2005; 23(2):249-256. · 2.19 Impact Factor
• Article: Competition between evaporation channels in neutron-deficient nuclei

  A. S. Zubov, G. G. Adamian, N. V. Antonenko, S. P. Ivanova, W. Scheid
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  ABSTRACT: Using the statistical model, we analyze deexcitation channels in excited neutron-deficient compound nuclei produced in fusion reactions with heavy ions. The results obtained without special adjustment to the selected evaporation channels are in good agreement with the experimental data near the maxima of excitation functions. The fusion probability, which is calculated with the dinuclear system model, is an important ingredient of the excitation function. Optimal reactions and evaporation channels for the production of neutron-deficient isotopes far from the stability line are proposed.
  Phys. Rev. C. 07/2003; 68(1).
• Article: Survivability of excited superheavy nuclei

  A. S. Zubov, G. G. Adamian, N. V. Antonenko, S. P. Ivanova, W. Scheid
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  ABSTRACT: The survivability of even-even and odd superheavy nuclei is analyzed on the basis of a statistical model and various theoretical predictions for nuclear properties. In this analysis, use is made of various methods for computing level densities. For Z<114 nuclei, calculations on the basis of all models predicting nuclear properties lead to close values for the ratio of the width with respect to the neutron channel to the width with respect to the fission channel. For Z≥114 nuclei, different values are obtained for this ratio. The dependence of the results on model parameters is discussed. The collective-enhancement factor in the level density is taken into account in the calculations.
  Physics of Atomic Nuclei 01/2003; 66(2):218-232. · 0.57 Impact Factor