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Nuclear Theory·nucl-th

Thursday·April 2, 2015

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 01

    [Submitted on 1 Apr 2015]

    Thermodynamics of isospin-asymmetric nuclear matter from chiral effective field theory

    Corbinian Wellenhofer · Jeremy W. Holt · Norbert Kaiser

    The density and temperature dependence of the nuclear symmetry free energy is investigated using microscopic two- and three-body nuclear potentials constructed from chiral effective field theory. The nuclear force models and many-body methods are benchmarked to properties of isospin-symmetric nuclear matter in the vicinity of the saturation density as well as the virial expansion of the neutron matter equation of state at low fugacities. The free energy per particle of isospin-asymmetric nuclear matter is calculated assuming a quadratic dependence of the interaction contributions on the isospin asymmetry. The spinodal instability at subnuclear densities is examined in detail.

    Comments:
    20 pages, 15 figures, 2 tables. additional typos corrected, cf. footnote 2 in arXiv:1603.02935
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1504.00177 [pdf]
    PRC(2015)·110 citations
  2. 02

    [Submitted on 1 Apr 2015]

    Diffuse approximation to the kinetic theory in a Fermi system

    V.M. Kolomietz · S.V. Lukyanov

    We suggest the diffuse approach to the relaxation processes within the kinetic theory for the Wigner distribution function. The diffusion and drift coefficients are evaluated taking into consideration the interparticle collisions on the distorted Fermi surface. Using the finite range interaction, we show that the momentum dependence of the diffuse coefficient has a maximum at Fermi momentum whereas the drift coefficient is negative and reaches a minimum at . For a cold Fermi system the diffusion coefficient takes the non-zero value which is caused by the relaxation on the distorted Fermi-surface at temperature . The numerical solution of the diffusion equation was performed for the particle-hole excitation in a nucleus with . The evaluated relaxation time is close to the corresponding result in a nuclear Fermi-liquid obtained within the kinetic theory.

    Comments:
    16 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1504.00216 [pdf]
    IJMPE(2015)·6 citations
  3. 03

    [Submitted on 1 Apr 2015]

    Effect of neutron skin thickness on projectile fragmentation

    Z. T. Dai · D. Q. Fang · Y. G. Ma · X. G. Cao · G. Q. Zhang · W. Q. Shen

    The fragment production in collisions of Ca+C at 50 MeV/nucleon are simulated via the Isospin-Dependent Quantum Molecular Dynamics (IQMD) model followed by the {GEMINI code}. {By changing the diffuseness parameter of neutron density distribution to obtain different neutron skin size, the effects of neutron skin thickness () on projectile-like fragments (PLF) are investigated. The sensitivity of isoscaling behavior to neutron skin size is studied, from which it is found that the isoscaling parameter has a linear dependence on . A linear dependence between and the mean [N(Z) is neutron(proton) number] of PLF is obtained as well.} The results show that thicker neutron skin will lead to smaller {isoscaling parameter} and N/Z. Therefore, it may be probable to extract information of neutron skin thickness from {isoscaling parameter} and N/Z.

    Comments:
    7 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1504.00226 [pdf]
    PRC(2015)·16 citations
  4. 04

    [Submitted on 1 Apr 2015]

    Dissipative effects on quarkonium spectral functions

    Yusuf Buyukdag🇺🇸 · Clint Young🇺🇸

    Quarkonium at finite temperature is described as an open quantum system whose dynamics are determined by a potential and drag coefficient , using a path integral with a non-local term. Path-integral Monte Carlo calculations determine the Euclidean Green function for this system to an accuracy greater than one part in a thousand and the maximum entropy method is used to determine the spectral function; challenges facing any kind of deconvolution are discussed in detail with the aim of developing intuition for when deconvolution is possible. Significant changes to the quarkonium spectral function in the channel are found, suggesting that any description of quarkonium at finite temperature, using a potential, must also carefully consider the effect of dissipation.

    Comments:
    13 pages, 7 figures, This is the version accepted for publication in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1504.00343 [pdf]
    PRC(2015)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE