B. Erdemchimeg

Publications (4)0.36 Total impact

• Article: Asymmetry of velocity distributions in peripheral reactions with heavy ions at Fermi energies

  T. I. Mikhailova, B. Erdemchimeg, G. Kaminski, A. G. Artyukh, M. Colonna, M. Di Toro, I. N. Mikhailov, Yu. M. Sereda, H. H. Wolter
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  ABSTRACT: The asymmetry of velocity distributions of projectile-like fragments produced in heavy ion collisions is considered. The calculations performed in the transport model approach (Vlasov kinetic equation with the collision term) are compared with the experimental data for the 22Ne (40MeV/nucleon) + 9Be and 18O (35 MeV/nucleon) + 9Be(181Ta) reactions. It is found that the velocity distributions contain two components: a direct component centered at the beam velocity and a dissipative component at lower energies, leading to asymmetry of velocity distributions. The direct component is interpreted empirically within the Goldhaber model, and the centroids and widths σ0 of the distributions for each fragment are extracted. It is found that value of σ0 derived from experimental data is smaller by a factor of 2 than the theoretical one. The dissipative (also called deep inelastic) component is described well by the transport calculations. It is shown that the ratio of yields of direct and dissipative components, which determines the asymmetry of velocity distributions, depends on shape of the deflection function.
  Bulletin of the Russian Academy of Sciences Physics 04/2012; 73(6):852-857.
• Article: Reconstructing the parameters of cluster breakup of light nuclei

  A. G. Artyukh, A. S. Denikin, Yu. M. Sereda, G. Kaminski, G. A. Kononenko, S. A. Klygin, A. N. Vorontsov, B. Erdemchimeg, Yu. G. Teterev, E. A. Shevchik
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  ABSTRACT: Kinematics of two-body Coulomb breakup of a prototype 11B nucleus into 4He and 7Li fragments is considered. The factors affecting the accuracy in measuring the breakup parameters are analyzed, and the corrections having an influence on the accuracy in reconstructing the primary parameters of the cluster breakup are estimated. A method for estimating the effect of an unknown contamination in the target and the use of this method for separating true and background events are discussed. The influence of background factors occurring in heavy ion fragmentation reactions is analyzed, and random coincidences due to high background fluxes of parasitic products are estimated. It is proposed to use magnetic analysis of correlated breakup products to reduce the background particle flux and substantially (by several orders of magnitude) improve the accuracy in measuring the cluster energies.
  Instruments and Experimental Techniques 12/2008; 52(1):13-24. · 0.36 Impact Factor
• Source

  Available from: T. I. Mikhailova

  Article: Asymmetry of velocity distributions in peripheral collisions at Fermi energies

  T. I. Mikhailova, B. Erdemchimeg, G. Kaminski, A. G. Artyukh, M Colonna, M. Di Toro, I. N. Mikhailov, Yu. M. Sereda, H. H. Wolter
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  ABSTRACT: Asymmetry of the velocity distributions of projectile like fragments produced in heavy-ion collisions is discussed. The calculations made in transport model approach (the solution of Vlasov kinetic equation with the collisions term) are compared with experimental data for the reactions $^{22}Ne$ ($40 A\cdot$MeV) + $^{9}$Be and $^{18}$O ($35 A\cdot$MeV) + $^9$Be ($^{181}$Ta) at forward angles. It is found that the velocity distributions appear to be composed of two contributions: a direct component centered at beam velocity and a dissipative component at lower energies, leading to an asymmetry of the velocity distributions. The direct component is interpreted empirically in the Goldhaber model, and the widths and centroids of the distributions are extracted. The remaining dissipative (also called deep-inelastic) contributions are then well described by the transport calculations. It is shown that the ratio of yields of direct and dissipative contributions, which determines the asymmetry of velocity distribution, depends on the shape of the deflection function.
  12/2008;
• Source

  Available from: T. I. Mikhailova

  Article: Competition of breakup and dissipative processes in peripheral collisions at Fermi energies

  T. I. Mikhailova, A. G. Artyukh, M Colonna, M. Di Toro, B. Erdemchimeg, G. Kaminski, I. N. Mikhailov, Yu. M. Sereda, H. H. Wolter
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  ABSTRACT: Heavy ion collisions in the Fermi energy regime may simultaneously show features of direct and dissipative processes. To investigate this behavior in detail, we study isotope and velocity distributions of projectile-like fragments in the reactions $18^$O (35 $A\cdot$MeV) + $9^$Be($181^$Ta) at forward angles. We decompose the experimental velocity distributions empirically into two contributions: a direct, `breakup' component centered at beam velocity and a dissipative component at lower velocities leading to a tail of the velocity distributions. The direct component is interpreted in the Goldhaber model, and the widths of the velocity distributions are extracted. The dissipative component is then successfully described by transport calculations. The ratio of the yields of the direct and the dissipative contributions can be understood from the behavior of the deflection functions. The isotope distributions of the dissipative component agree qualitatively with the data, but the modification due to secondary de-excitation needs to be considered. We conclude, that such reactions are of interest to study the equilibration mechanism in heavy ion collisions.
  12/2008;