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Nuclear Theory·nucl-th

Thursday·August 10, 2017

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    Tracing the evolution of nuclear forces under the similarity renormalization group

    Calvin W. Johnson

    I examine the evolution of nuclear forces under the similarity renormalization group (SRG) using traces of the many-body configuration-space Hamiltonian. While SRG is often said to "soften" the nuclear interaction, I provide numerical examples which paint a complementary point of view: the primary effect of SRG, using the kinetic energy as the generator of the evolution, is to shift downward the diagonal matrix elements in the model space, while the off-diagonal elements undergo significantly smaller changes. By employing traces, I argue that this is a very natural outcome as one diagonalizes a matrix, and helps one to understand the success of SRG.

    nucl-thPLB(2017)·4 citations
  2. 02

    Mixture of quark and gluon fluids described in terms of anisotropic hydrodynamics

    Ewa Maksymiuk🇵🇱

    A system of equations of anisotropic hydrodynamics that describes mixture of quark and gluon fluids is studied. The equations are based on the zeroth, first, and second moments of the RTA kinetic equations. Tests of this formulation are performed by comparing the results of anisotropic hydorodynamics with the exact solutions of the Boltzmann equations for a mixture of fluids in the Bjorken flow limit. One finds a very good agreement between the hydrodynamic and kinetic-theory results.

    nucl-thActa Phys.Polon.Supp.(2017)·1 citation
  3. 03

    Enhanced nucleon transfer in tip collisions of U+Sn

    Kazuyuki Sekizawa

    Multinucleon transfer processes in low-energy heavy ion reactions have attracted increasing interest in recent years aiming at production of new neutron-rich isotopes. Clearly, it is an imperative task to further develop understanding of underlying reaction mechanisms to lead experiments to success. In this paper, from systematic time-dependent Hartree-Fock calculations for the U+Sn reaction, it is demonstrated that transfer dynamics depend strongly on the orientations of U, quantum shells, and collision energies. Two important conclusions are obtained: (i) Experimentally observed many-proton transfer from U to Sn can be explained by a multinucleon transfer mechanism governed by enhanced neck evolution in tip collisions; (ii) Novel reaction dynamics are observed in tip collisions at energies substantially above the Coulomb barrier, where a number of nucleons are transferred from Sn to U, producing transuranium nuclei as primary reaction products, that could be a means to synthesize superheavy nuclei. Both results indicate the importance of the neck (shape) evolution dynamics, which are sensitive to the orientations, shell effects and collision energies, for exploring possible pathways to produce new unstable nuclei.

    nucl-thnucl-exPRC(2017)·63 citations

Affiliations

first authorsco-authorsvia INSPIRE