T. M. Shneidman

Publications (19)13.12 Total impact

• Article: Multiple reflection-asymmetric-type band structures in 220Th and dinuclear model

  T. M. Shneidman, G. G. Adamian, N. V. Antonenko, R. V. Jolos, W. Scheid
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  ABSTRACT: The negative-parity bands with different values of K in 220Th are analysed within the dinuclear system model which was previously used for describing the ground-state alternating-parity bands with K = 0 in deformed actinides. The model is based on the assumption that the cluster type shapes are produced by the collective motion in the mass-asymmetry coordinate. To describe the reflection-asymmetric collective modes characterized by the nonzero values of K , the intrinsic excitations of clusters are taken into account. The observed excitation spectrum, angular-momentum dependence of the parity splitting and the staggering behaviour of the B(E1)/B(E2) ratios are explained.
  European Physical Journal A 04/2012; 47(3):1-10. · 2.19 Impact Factor
• Source

  Available from: ArXiv

  Article: Multiple reflection-asymmetric type band structures in $^{220}Th$ and dinuclear model

  T. M. Shneidman, G. G. Adamian, N. V. Antonenko, R. V. Jolos, W. Scheid
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  ABSTRACT: The negative parity bands in $^{220}$Th are analyzed within the dinuclear system model which was previously used for describing the alternating-parity bands in deformed actinides. The model is based on the assumption that cluster type shapes are produced by the motion of nuclear system in the mass-asymmetry coordinate. To describe the reflection-asymmetric collective modes characterized by nonzero values of $K$, the intrinsic excitations of clusters are taken into account. The angular momentum dependence of the parity splitting and the staggering behavior of the $B(E1)/B(E2)$ ratios as functions of angular momentum are explained. Comment: 17 pages, 7 figures
  01/2010;
• Article: Nuclear structure in the dinuclear model with rotating clusters

  G. G. Adamian, N. V. Antonenko, R. V. Jolos, Yu. V. Palchikov, T. M. Shneidman, W. Scheid
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  ABSTRACT: The dinuclear-system model can be applied to nuclear structure. Here, we study deformed clusters which rotate with respect to the internuclear distance and exchange nucleons. The model can be used to explain the band structure of nuclear spectra, especially the parity splitting observed in actinides, e.g., in 238U.
  Physics of Atomic Nuclei 07/2007; 70(8):1350-1356. · 0.57 Impact Factor
• Article: Cluster approach to the structure of nuclei with Z ≥ 96

  T. M. Shneidman, G. G. Adamian, N. V. Antonenko, R. V. Jolos
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  ABSTRACT: The properties of alternating parity bands in heavy nuclei 234Th, 239–242U, 241–245Pu, 243–248Cm, 245–250Cf, 248–251Fm, 249–254No, 253–256Rf, and 258Sg are analyzed within the dinuclearsystem model. The model is based on the assumption that the cluster-type shapes are produced by the motion of the nuclear system in the mass-asymmetry coordinate. The energies of the low-lying states whose parity is opposite to the parity of the ground state are predicted for the first time.
  Physics of Atomic Nuclei 07/2007; 70(8):1452-1456. · 0.57 Impact Factor
• Article: Possible alternative parity bands in the heaviest nuclei

  T. M. Shneidman, G. G. Adamian, N. V. Antonenko, R. V. Jolos
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  ABSTRACT: The low-lying alternative parity bands in heaviest nuclei are predicted for the first time. The parity splitting and electric dipole, quadrupole, and octupole transition moments of heavy nuclei are calculated within a cluster model. The model is based on the assumption that reflection asymmetric shapes are produced by the motion of the nuclear system in the mass asymmetry coordinate.
  Physical Review C 08/2006; 74(3):34316. · 3.31 Impact Factor
• Article: Cluster interpretation of parity doublet rotational bands in odd-mass nuclei

  G.G. Adamian, Tashkent Institute of Nuclear Physics, N.V. Antonenko, R.V. Jolos, T.M. Shneidman
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  ABSTRACT: The structure of parity doublet rotational bands in odd actinides and medium mass nuclei is described in a cluster model. The model is based on the assumption that cluster-type shapes are produced by the motion of the nuclear system in the mass-asymmetry coordinate. The calculated rotational bands and the electric dipole transitions between the members of the parity doublet are in good agreement with the experimental data.
  Physical Review. C, Nuclear Physics. 11/2004; 70(6).
• Source

  Available from: bas.bg

  Article: Nuclear structure with the dinuclear model

  G. G. Adamian, N. V. Antonenko, R. V. Jolos, Yu. V. Palchikov, W. Scheid, T. M. Shneidman
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  ABSTRACT: The dinuclear system concept is applied to the explanation of the structure of nuclei. The appearance of a low-lying band with negative parity states near the ground-state band in actinides and other nuclei is described by oscillations of the dinuclear system in the mass-asymmetry coordinate. The results for the parity splitting and electric multipole moments in alternating parity bands of these nuclei are in agreement with experimental data. The ground-state band and the superdeformed band of 60Zn are interpreted as being caused by α-particle and Be clusterizations, respectively. Hyperdeformed nuclei are assumed as dinuclear systems which could directly be built up in heavy-ion collisions. Signatures of hyperdeformed states in such reactions could be γ transitions between these states and their decay into the nuclei forming the hyperdeformed nucleus.
  Physics of Atomic Nuclei 08/2004; 67(9):1701-1708. · 0.57 Impact Factor
• Article: Decay out of superdeformed bands in the mass region A≈ 190 within a cluster approach

  G. G. Adamian, N. V. Antonenko, R. V. Jolos, Yu. V. Palchikov, W. Scheid, T. M. Shneidman
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  ABSTRACT: A cluster model is applied to the description of the decay out phenomenon of the yrast superdeformed states in the nuclei 190,192,194Hg and 192,194,196Pb. The model is based on the assumption that highly deformed cluster-type shapes are produced by a collective motion of the nuclear system in the charge asymmetry coordinate. As follows from our analysis, the sudden transition from the superdeformed minimum to the normal deformed minimum occurs because of the crossing of superdeformed band with the nearest neighboring excited normal deformed band and spreading of collective states among the compound states.
  Phys. Rev. C. 05/2004; 69(5).
• Article: Superdeformation as cluster state

  G. G. Adamian, N. V. Antonenko, R. V. Jolos, Yu. V. Palchikov, W. Scheid, T. M. Shneidman
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  ABSTRACT: A cluster approach is applied to describing the decay-out phenomenon of the yrast superdeformed states for mass region A≈190.
  Physics of Atomic Nuclei 01/2004; 67(9):1709-1714. · 0.57 Impact Factor
• Article: Dinuclear System Phenomena in Nuclear Structure and Nuclear Reactions

  G. G. Adamian, A. V. Andreev, N. V. Antonenko, S. P. Ivanova, R. V. Jolos, W. Scheid, T. M. Shneidman
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  ABSTRACT: Properties of states of the alternating parity bands, as well as super- and hyper-deformed states are analyzed within a cluster model.
  Acta Physica Polonica Series B 03/2003; 34:2147. · 0.90 Impact Factor
• Article: Generation of angular momentum of fission fragments in a cluster model

  T. M. Shneidman, G. G. Adamian, N. V. Antonenko, S. P. Ivanova, R. V. Jolos, W. Scheid
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  ABSTRACT: Based on the dinuclear system concept, the role of bending vibrations in creation of the angular momentum of primary fission fragments is investigated. For 252Cf spontaneous fission, the angular momenta of the fragments are calculated as a function of the neutron multiplicity and compared with available experimental data. Different cluster compositions of the 252Cf fission modes at the scission point are considered.
  Physics of Atomic Nuclei 01/2003; 66(2):206-217. · 0.57 Impact Factor
• Source

  Available from: arxiv.org

  Article: Cluster Interpretation of Properties of Alternating Parity Bands in Heavy Nuclei

  T. M. Shneidman, G. G. Adamian, N. V. Antonenko, R. V. Jolos, W. Scheid
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  ABSTRACT: The properties of the states of the alternating parity bands in actinides, Ba, Ce and Nd isotopes are analyzed within a cluster model. The model is based on the assumption that cluster type shapes are produced by the collective motion of the nuclear system in the mass asymmetry coordinate. The calculated spin dependences of the parity splitting and of the electric multipole transition moments are in agreement with the experimental data. Comment: 29 pages, 10 figures
  09/2002;
• Article: Role of bending mode in generation of angular momentum of fission fragments

  T. M. Shneidman, G. G. Adamian, N. V. Antonenko, S. P. Ivanova, R. V. Jolos, W. Scheid
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  ABSTRACT: Based on the dinuclear system concept, the role of bending vibrations in creation of the angular momentum of the primary fission fragments is investigated. For 252Cf spontaneous fission, the angular momenta of the fragments are calculated as a function of the neutron multiplicity and compared with available experimental data.
  Physical Review C 05/2002; 65(6):64302. · 3.31 Impact Factor
• Source

  Available from: Alexis Diaz-Torres

  Conference Proceeding: Dinuclear system model for dynamics and structure

  G.G. Adamian, N.V. Antonenko, E.A. Cherepanov, S.P. Ivanova, R.V. Jolos, A.K. Nasirov, V.V. Volkov, A. Diaz-Torres, W. Scheid, T.M. Shneidman
  International Symposium on Exotic Nuclei EXON2001, July 24-28, 2001, Lake Baikal, Russia; 07/2001
• Article: Clustering aspects of nuclei in highly deformed states

  T. M. Shneidman, G. G. Adamian, N. V. Antonenko, S. P. Ivanova, W. Scheid
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  ABSTRACT: The potential energies, the moments of inertia, and the quadrupole and octupole moments of dinuclear systems are compared with corresponding values for the highly deformed nuclear states. The idea is advocated that hyperdeformed states of nuclei are close to near-symmetric dinuclear systems. The superdeformed states are considered as asymmetric dinuclear systems. The cluster superdeformed and hyperdeformed states have quite a large octupole deformation. Measurement of octupole deformations of highly deformed nuclei can answer the question of whether these nuclei exist in cluster configurations.
  Physics of Atomic Nuclei 09/2000; 63(10):1716-1723. · 0.57 Impact Factor
• Source

  Available from: arxiv.org

  Article: Relationship between dinuclear systems and nuclei in highly deformed states

  T. M. Shneidman, G. G. Adamian, N. V. Antonenko, S. P. Ivanova, W. Scheid
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  ABSTRACT: Potential energies, moments of inertia, quadrupole and octupole moments of dinuclear systems are compared with the corresponding quantities of strongly deformed nuclei. As dinuclear system we denote two touching nuclei (clusters). It is found that the hyperdeformed states of nuclei are close to those of nearly symmetric dinuclear systems, whereas the superdeformed states are considered as states of asymmetric dinuclear systems. The superdeformed and hyperdeformed states constructed from two touching clusters have large octupole deformations. The experimental measurement of octupole deformation of the highly deformed nuclei can answer whether these nuclei have cluster configurations as described by the dinuclear model. Comment: 21 pages, 7 figures, submitted to Nucl.Phys.A
  11/1999;
• Source

  Available from: A. K. Nasirov

  Article: Towards exotic nuclei via binary reaction mechanism

  N. V. Antonenko, A. K. Nasirov, T. M. Shneidman, V. D. Toneev
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  ABSTRACT: Assuming a binary reaction mechanism, the yield of isotopes near the heaviest $N=Z$ neutron-deficit nucleus $^{100}$Sn is studied with a microscopic transport model. The large influence of nuclear shell structure and isotope composition of the colliding nuclei on the production of exotic nuclei is demonstrated. It is shown that the reaction $^{54}$Fe+$^{106}$Cd seems to be most favourable for producing primary exotic Sn isotopes which may survive if the excitation energy in the entrance reaction channel is less than about 100 MeV. In the case of large differences in the charge (mass) numbers between entrance and exit channels the light fragment yield is essentially fed from the decay of excited primary heavier fragments. The existence of optimal energies for the production of some oxygen isotopes in the binary mechanism is demonstrated for the $^{32}$S+$^{197}$Au reaction.
  12/1997;
• Article: Relationship between dinuclear systems and nuclei in highly deformed states

  T.M. Shneidman, G.G. Adamian, N.V. Antonenko, S.P. Ivanova, W. Scheid
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  ABSTRACT: Potential energies, moments of inertia, quadrupole and octupole moments of dinuclear systems are compared with the corresponding quantities of strongly deformed nuclei. As dinuclear system we denote two touching nuclei (clusters). It is found that the hyperdeformed states of nuclei are close to those of nearly symmetric dinuclear systems, whereas the superdeformed states are considered as states of asymmetric dinuclear systems. The superdeformed and hyperdeformed states constructed from two touching clusters have large octupole deformations. The experimental measurement of octupole deformation of the highly deformed nuclei can answer whether these nuclei have cluster configurations as described by the dinuclear model.
  Nuclear Physics A.
• Article: Cluster interpretation of parity splitting in alternating parity bands

  T.M. Shneidman, G.G. Adamian, N.V. Antonenko, R.V. Jolos, W. Scheid
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  ABSTRACT: The parity splitting in actinides is described with a cluster model of oscillations in mass asymmetry coordinate. The spin dependence of the calculated parity splitting is in a good agreement with the experimental data.
  Physics Letters B.