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Search Results: 1 - 10 of 189855 matches for " G. G. Adamian "
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Comment on "Two Distinct Quasifission Modes in the 32S+232Th Reaction" (by D.J.Hinde et al. PRL 101, 092701 (2008))
G. G. Adamian,N. V. Antonenko
Physics , 2009, DOI: 10.1103/PhysRevC.81.019803
Abstract: The results of a recent paper by D.J.Hinde et al., PRL 101, 092701 (2008) are discussed.
Polarization of the nuclear surface in deformed nuclei
G. Scamps,D. Lacroix,G. G. Adamian,N. V. Antonenko
Physics , 2013, DOI: 10.1103/PhysRevC.88.064327
Abstract: The density profiles of around 750 nuclei are analyzed using the Skyrme energy density functional theory. Among them, more than 350 nuclei are found to be deformed. In addition to rather standard properties of the density, we report a non-trivial behavior of the nuclear diffuseness as the system becomes more and more deformed. Besides the geometric effects expected in rigid body, the diffuseness acquires a rather complex behavior leading to a reduction of the diffuseness along the main axis of deformation simultaneously with an increase of the diffuseness along the other axis. The possible isospin dependence of this polarization is studied. This effect, that is systematically seen in medium- and heavy-nuclei, can affect the nuclear dynamical properties. A quantitative example is given with the fusion barrier in the $^{40}$Ca+ $^{238}$U reaction.
Influence of proton shell closure on production of new superheavy nuclei
Kuzmina A. N.,Adamian G. G.,Antonenko N. V.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20123817004
Abstract: The shell structure of nuclei with Z > 104 is studied with modified two-center shell model. Using macroscopic-microscopic approach, the mass excesses and Qα-values are calculated and compared with available experimental data. Our calculations reveal quite strong shell effects at Z = 120-126 as well as at N = 184. If our predictions for the heaviest nuclei are correct then one can expect the production of evaporation residues with Z ~ 120 in the reactions 50Ti+249Cf and 54Cr+248Cm with the cross sections 23 and 10 fb, respectively. Nuclei with Z = 120 and N = 178 – 182 are expected to have Qα about 11 MeV and life-time of 0.17 ms – 0.16 s.
Tunneling with dissipation in open quantum systems
G. G. Adamian,N. V. Antonenko,W. Scheid
Physics , 1997, DOI: 10.1016/S0375-9601(98)00367-3
Abstract: Based on the general form of the master equation for open quantum systems the tunneling is considered. Using the path integral technique a simple closed form expression for the tunneling rate through a parabolic barrier is obtained. The tunneling in the open quantum systems strongly depends on the coupling with environment. We found the cases when the dissipation prohibits tunneling through the barrier but decreases the crossing of the barrier for the energies above the barrier. As a particular application, the case of decay from the metastable state is considered.
Mass distributions for induced fission of different Hg isotopes
A. V. Andreev,G. G. Adamian,N. V. Antonenko
Physics , 2011, DOI: 10.1103/PhysRevC.86.044315
Abstract: With the improved scission-point model the mass distributions are calculated for induced fission of different Hg isotopes with the masses 180-196. The drastic change in the shape of the mass distribution from asymmetric to symmetric is revealed with increasing mass number of the fissioning Hg isotope, and the reactions are proposed to verify this prediction experimentally. The asymmetric mass distribution of fission fragments observed in the recent experiment on the fission of 180Hg is explained. The calculated mass distribution and mean total kinetic energy of fission fragments are in a good agreement with the available experimental data.
Isotopic dependence of fusion cross sections in reactions with heavy nuclei
G. G. Adamian,N. V. Antonenko,W. Scheid
Physics , 1999, DOI: 10.1016/S0375-9474(00)00317-1
Abstract: The dependence of fusion cross section on the isotopic composition of colliding nuclei is analysed within the dinuclear system concept for compound nucleus formation. Probabilities of fusion and surviving probabilities, ingredients of the evaporation residue cross sections, depend decisively on the neutron numbers of the dinuclear system. Evaporation residue cross sections for the production of actinides and superheavy nuclei, listed in table form, are discussed and compared with existing experimental data. Neutron-rich radioactive projectiles are shown to lead to similar fusion cross sections as stable projectiles.
Extreme quadrupole deformation and clusterization
Darai J.,Cseh J.,Adamian G.,Antonenko N.
EPJ Web of Conferences , 2012, DOI: 10.1051/epjconf/20123816001
Abstract: We discuss a simple symmetry-adapted method for the determination of the shape isomers, and for the study of their possible fragmentation. In other words the connection between the quadrupole (collective) and dipole (cluster) degrees of freedom is considered in terms of an easily applicable, yet microscopic method. The energetics is taken into account by the double-folding method. Special attention is focused on those cases in which the theoretical predictions have a direct comparison with experimental observation.
Neutron pair transfer in sub-barrier capture process
V. V. Sargsyan,G. Scamps,G. G. Adamian,N. V. Antonenko,D. Lacroix
Physics , 2013, DOI: 10.1103/PhysRevC.88.064601
Abstract: The sub-barrier capture reactions following the neutron pair transfer are proposed to be used for the indirect study of neutron-neutron correlation in the surface region of nucleus. The strong effect of the dineutron-like clusters transfer stemming from the surface of magic and non-magic nuclei $^{18}$O, $^{48}$Ca, $^{64}$Ni, $^{94,96}$Mo, $^{100,102,104}$Ru, $^{104,106,108}$Pd, and $^{112,114,116,118,120,124,132}$Sn is demonstrated. The dominance of two-neutron transfer channel at the vicinity of the Coulomb barrier is further supported by time-dependent mean-field approaches.
Dynamics of mass asymmetry in nuclear molecular systems
G.G. Adamian,A. Andreev,N.V. Antonenko,R.V. Jolos
Revista mexicana de física , 2006,
Abstract: El concepto de un sistema dinuclear supone dos nucleós en contacto que pueden intercambiar nucleones entre ellos. Posibles aplicaciones de este modelo se encuentran en la estructura nuclear, reacciones de fusión para crear núcleos superpesados y la transferencia de varios nucleones.
Production of doubly magic nucleus 100Sn in 72,74,76Kr+40Ca, 72,74,76Kr+40Ar and 72,74,76Kr+32S reactions at 4 6 MeV/nucleon
Kalandarov Sh.A.,Adamian G.G.,Antonenko N.V.,Wieleczko J.P.
EPJ Web of Conferences , 2011, DOI: 10.1051/epjconf/20111710004
Abstract: The mechanism of production of evaporation residues in low energy fusion reactions is investigated within the dinuclear system model. The model predictions for the production cross sections of exotic nuclei are compared with the available experimental data. The possibilities of production of doubly magic nucleus 100Sn via particle evaporation channels and 12C emission channel in the reactions 72,74,76Kr+40Ca, 72,74,76Kr+40Ar and 72,74,76Kr+32S are investigated at bombarding energies 4 6 MeV/nucleon.
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