C. R. Escudero

University of Texas at El Paso, El Paso, TX, United States

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Publications (5)5.47 Total impact

  • C. R. Escudero · J. A. López · C. O. Dorso ·
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    ABSTRACT: It is determined that isoscaling data, if produced by two isotopic reactions under similar thermodynamic conditions, should satisfy a simple numerical relationship. This, which helps to explore the symmetry of thermodynamic conditions of isotopic reactions, is studied using molecular dynamics simulations of 40Ca+40Ca, 48Ca+48Ca, and 52Ca+52Ca, at beam energies from 35 MeV / A to 85 MeV / A, and as a function of time. Strong deviations from the rule are detected in the beginning of the collision, with an excellent convergence at long times for some energies. A comparison with experimental data and other calculations is also included. © 2007 American Institute of Physics
    02/2007; 884(1):299-305. DOI:10.1063/1.2710596
  • R. Gamboa · C. O. Dorso · C. R. Escudero · J. A. Lopez ·
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    ABSTRACT: The dependence of nuclear isoscaling on the stiffness of the equation of state (EOS) was studied using molecular dynamics simulations. Reactions of ^40Ca+ ^40Ca, ^48Ca+ ^48Ca and ^52Ca+ ^52Ca at beam energies ranging from 20 MeV/A to 85 MeV/A were simulated using the Pandharipande EOS of 535 MeV and compared to previous results obtained with the EOS of 250 MeV. The analysis included a study of the time evolution of this effect and the estimation of the isoscaling parameters alpha,beta. Preliminary results indicate that isoscaling exists at all energies and at all times starting from the early primary isotope distributions all the way to 5000fm / fm c . - c. The alpha,beta were found to vary substantially from values obtained with the soft EOS.
  • Source
    A. Dávila · C.R. Escudero · J.A. López · C.O. Dorso ·
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    ABSTRACT: The property of isoscaling in nuclear fragmentation is studied using a simple bond percolation model with ``isospin'' added as an extra degree of freedom. It is shown analytically, first, that isoscaling is expected to exist in such a simple model with the only assumption of fair sampling with homogeneous probabilities. Second, numerical percolations of hundreds of thousands of grids of different sizes and with different $N$ to $Z$ ratios confirm this prediction with remarkable agreement. It is thus concluded that isoscaling emerges from the simple assumption of fair sampling with homogeneous probabilities, a requirement which, if put in the nomenclature of the minimum information theory, translates simply into the existence of equiprobable configurations in maximum entropy states.
    Physica A: Statistical Mechanics and its Applications 05/2005; 374(2-374):663-668. DOI:10.1016/j.physa.2006.07.049 · 1.73 Impact Factor
  • Source
    C. O. Dorso · C. R. Escudero · M. Ison · JA Lopez ·
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    ABSTRACT: The origin and dynamical evolution of isoscaling was studied using classical molecular dynamics simulations of ${}^{40}$Ca + ${}^{40}$Ca, ${}^{48}$Ca + ${}^{48}$Ca, and ${}^{52}$Ca + ${}^{52}$Ca, at beam energies ranging from $20 \ MeV/A$ to $85 MeV/A$. The analysis included a study of the time evolution of this effect. Isoscaling was observed to exist in these reactions from the very early primary isotope distributions (produced by highly {\it non-equilibrated} systems) all the way to asymptotic times. This indicates that isoscaling is independent of quantum effects and thermodynamical equilibrium. In summary, collision-produced isoscaling appears to be due more to the mere partitioning of the proton-neutron content of the participant nuclei, than to specific details of the reaction dynamics.
    Physical Review C 04/2005; 73(4). DOI:10.1103/PhysRevC.73.044601 · 3.73 Impact Factor
  • Jorge Lopez · C. O. Corso · C. Escudero ·
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    ABSTRACT: The evolution of isoscaling is studied using classical molecular dynamics simulations of several reactions at various energies. Isoscaling at different stages of the reaction was calculated and the validity of the isoscaling power law was estimated.