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Nuclear Theory·nucl-th

Monday·July 13, 2015

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 10 Jul 2015]

    Microscopic calculations based on chiral two- and three-nucleon forces for proton- and He-nucleus scattering

    Masakazu Toyokawa · Masanobu Yahiro · Takuma Matsumoto · Kosho Minomo · Kazuyuki Ogata · Michio Kohno

    We investigate the effects of chiral three-nucleon force (3NF) on proton scattering at 65 MeV and He scattering at 72 MeV/nucleon from heavier targets, using the standard microscopic framework composed of the Brueckner-Hartree-Fock (BHF) method and the -matrix folding model. For nuclear matter, the matrix is evaluated from chiral two-nucleon force (2NF) of NLO and chiral 3NF of NNLO by using the BHF method. Since the matrix thus obtained is numerical and nonlocal, an optimum local form is determined from the on-shell and near-on-shell components of matrix that are important for elastic scattering. For elastic scattering, the optical potentials are calculated by folding the local chiral matrix with projectile and target densities. This microscopic framework reproduces the experimental data without introducing any adjustable parameter. Chiral-3NF effects are small for proton scattering, but sizable for He scattering at middle angles where the data are available. Chiral 3NF, mainly in the 2-exchange diagram, makes the folding potential less attractive and more absorptive for all the scattering.

    Comments:
    5 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1507.02807 [pdf]
    PRC(2015)·49 citations
  2. 02

    [Submitted on 10 Jul 2015]

    The Hypercentral Constituent Quark Model and its symmetry

    M.M. Giannini🇮🇹 · E. Santopinto🇮🇹

    The hypercentral CQM, which is inspired by Lattice QCD calculations for quark-antiquark potentials, is presented, stressing its underlying symmetry. Its results for the spectrum, the helicity amplitudes and the elastic form factors are briefly reported. In the latter case the model has allowed to show, for the first time in the framework of a quark model, that relativistic effects are responsible for a deviation from the usually accepted dipole behaviour, in agreement with recent data taken at the Jefferson Lab.

    Comments:
    Workshop Symmetries in Nuclear Structure, Erice March 23-30, 2003, in honor of the 60th birthday of Franco Iachello Published in Symmetries in nuclear structure, Science and culture Series, Physics 24, 384-389, (A. Vitturi, R. F. Casten eds.) World Scientific, Singapore 2004
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1507.02817 [pdf]
    0 citations
  3. 03

    [Submitted on 10 Jul 2015]

    Relativistic second-order dissipative hydrodynamics at finite chemical potential

    Amaresh Jaiswal🇩🇪 · Bengt Friman🇩🇪 · Krzysztof Redlich🇵🇱

    Starting from the Boltzmann equation in the relaxation time approximation and employing a Chapman-Enskog like expansion for the distribution function close to equilibrium, we derive second-order evolution equations for the shear stress tensor and the dissipative charge current for a system of massless quarks and gluons. The transport coefficients are obtained exactly using quantum statistics for the phase space distribution functions at non-zero chemical potential. We show that, within the relaxation time approximation, the second-order evolution equations for the shear stress tensor and the dissipative charge current can be decoupled. We find that, for large values of the ratio of chemical potential to temperature, the charge conductivity is small compared to the coefficient of shear viscosity. Moreover, we show that in the relaxation-time approximation, the limiting behaviour of the ratio of heat conductivity to shear viscosity is qualitatively similar to that obtained for a strongly coupled conformal plasma.

    Comments:
    v3: 6 pages, 2 figure, published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1507.02849 [pdf]
    PLB(2015)·73 citations

Affiliations

first authorsco-authorsvia INSPIRE