A. S. Zubov

Joint Institute for Nuclear Research, Dubno, Moskovskaya, Russia

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Publications (29)44.83 Total impact

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    ABSTRACT: Using the cluster interpretation and statistical approach we describe the population and properties of yrast superdeformed band in 152Dy. Relative intensities of E2 transitions in superdeformed band and excitation functions are calculated for different beam energies and evaporation channels. A quite good agreement of our results with the experimental data confirms the validity of cluster interpretation of strongly deformed nuclear states and supports our predictions concerning the possible formation of hyperdeformed states in the entrance channel of heavy-ion reactions.
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    ABSTRACT: The isotopic dependence of the complete fusion (capture) cross section is analyzed in the reactions $^{130,132,134,136,138,140,142,144,146,148,150}$Xe+$^{48}$Ca with stable and radioactive beams. It is shown for the first time that the very neutron-rich nuclei $^{186-191}$W can be reached with relatively large cross sections by complete fusion reactions with radioactive ion beams at incident energies near the Coulomb barrier. A comparison between the complete fusion and fragmentation reactions for the production of neutron-rich W and neutron-deficient Rn isotopes is performed.
    Physical Review C 11/2013; 88(5). DOI:10.1103/PhysRevC.88.054609 · 3.88 Impact Factor
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    ABSTRACT: By using the dinuclear system approach combined with quantum diffusion and statistical methods, the population of the yrast superdeformed band in the ^{152}Dy nucleus is treated. The excitation functions are calculated and analyzed for the population of the superdeformed states in xn, pxn, and αxn evaporation channels of different asymmetric and almost symmetric reactions. The dependencies of the relative intensities of E2 transitions between the rotational states of the superdeformed band on the de-excitation channels, charge asymmetry of the entrance channel, and beam energy are established. The restrictions of the population of the superdeformed band in spin by complete fusion and quasifission processes are shown. The calculated results are compared with the available experimental data.
    Physical Review C 09/2013; 88(3). DOI:10.1103/PhysRevC.88.034607 · 3.88 Impact Factor
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    ABSTRACT: The production of superdeformed nuclei, treated as cluster configurations in the A ~ 150 region is described in the framework of statistical approach and the dinuclear system concept. The competition of particle emission from the dinuclear system and quasifission is taken into account. The calculated nuclear characteristics of the superdeformed band in 152Dy are close to the experimental values.
    Journal of Physics Conference Series 04/2013; 436(1):2062-. DOI:10.1088/1742-6596/436/1/012062
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    ABSTRACT: The high-spin hyperdeformed (HD) nuclear states treated as dinuclear or quasi-molecular configurations are suggested to be directly populated in heavy ion-collisions at near Coulomb barrier energies.
    Journal of Physics Conference Series 04/2013; 436(1):2060-. DOI:10.1088/1742-6596/436/1/012060
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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.
    International Journal of Modern Physics E 05/2012; 20(04). DOI:10.1142/S0218301311018976 · 0.84 Impact Factor
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    ABSTRACT: Using the statistical approach, 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. We calculate relative intensities of E2-transitions between the rotational states and entry spin distributions of the residual nuclei, evaporation residue cross sections, and excitation functions for these reactions. Fermi-gas model is used for the calculation of level density, and damping of shell effects both with excitation energy and angular momentum is taking into account. The results are in a good agreement with the experiment data.
    The European Physical Journal Conferences 02/2012; 21:06002-. DOI:10.1051/epjconf/20122106002
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    ABSTRACT: Within the dinuclear system model we analyse the production of yet unknown superheavy nuclei with Z > 118 and neutron-deficient isotopes of Pu in various complete fusion reactions. The yields of superheavies with Z > 118 are sensitive to the location of the next proton shell closure. The emission of neutron from the dinuclear systems is discussed.
    International Journal of Modern Physics E 01/2012; 17(10). DOI:10.1142/S0218301308011628 · 0.84 Impact Factor
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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.
    Physical Review C 10/2011; 84(4). DOI:10.1103/PhysRevC.84.044320 · 3.88 Impact Factor
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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. DOI:10.1088/1742-6596/282/1/012002
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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.
    Physical Review C 09/2010; 82(3). DOI:10.1103/PhysRevC.82.034610 · 3.88 Impact Factor
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    ABSTRACT: Possibilities of transfer-induced fission of new isotopes of superheavy nuclei with charge numbers 103-108 are studied for the first time in the reactions Ca48+Cm244,246,248 at energies near the corresponding Coulomb barriers. The predicted cross sections are found to be measurable with the detection of three-body final states.
    Physical Review C 07/2010; 82(1). DOI:10.1103/PhysRevC.82.017601 · 3.88 Impact Factor
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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.
    Physical Review C 02/2010; 81(2). DOI:10.1103/PhysRevC.81.024607 · 3.88 Impact Factor
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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 11/2009; 40(6):847-889. DOI:10.1134/S1063779609060057 · 0.74 Impact Factor
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    ABSTRACT: Using the statistical model, we calculate the induced fission cross sections for the nuclei 211-223Ra in their peripheral collisions with 208Pb. The role of closed shell N = 126 is studied. Level densities of the Fermi-gas model and of the model with collective enhancement are used. Taking into account the particle-hole excitation in addition to the collective Coulomb excitation, we obtain satisfactory agreement with the experimental data.
    10/2009; DOI:10.1063/1.3258263
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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 06/2009; 72(6):928-937. DOI:10.1134/S1063778809060040 · 0.60 Impact Factor
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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 03/2009; 72(3):425-438. DOI:10.1134/S1063778809030053 · 0.60 Impact Factor
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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.
    Physical Review C 10/2008; 78(4). DOI:10.1103/PhysRevC.78.044605 · 3.88 Impact Factor
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    ABSTRACT: The concept of a nuclear molecule or a dinuclear system assumes two touching nuclei which carry out motion in the internuclear distance and exchange nucleons by transfer. The corresponding model can be applied to nuclear structure, to fusion reactions leading to superheavy nuclei and to multi-nucleon transfer.
    International Journal of Modern Physics E 01/2008; 16(04):34-. DOI:10.1142/S0218301307006472 · 0.84 Impact Factor
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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. DOI:10.1140/epja/i2006-10451-7 · 2.42 Impact Factor