PaperPanorama
FAQ

Nuclear Theory·nucl-th

Friday·August 4, 2017

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    [Submitted on 2 Aug 2017]

    Coarse graining the Bethe-Goldstone equation: nucleon-nucleon high momentum components

    I. Ruiz Simo · R. Navarro Perez · J.E. Amaro · E. Ruiz Arriola

    The delta-shell representation of the nuclear force allows a simplified treatment of nuclear correlations. We show how this applies to the Bethe-Goldstone equation as an integral equation in coordinate space with a few mesh points, which is solved by inversion of a 5-dimensional square matrix in the single channel cases and a matrix for the tensor-coupled channels. This allows us to readily obtain the high momentum distribution, for all partial waves, of a back-to-back correlated nucleon pair in nuclear matter. We find that the probability of finding a high-momentum correlated neutron-proton pair is about 18 times that of a proton-proton one, as a result of the strong tensor force, thus confirming in an independent way previous results and measurements.

    Comments:
    Equation (2) is wrong, and all the results of the article based on that equation for the coupled nucleon partial waves are, consequently, wrong as well
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1708.00878 [pdf]
    PRC(2017)·7 citations
  2. 02

    [Submitted on 3 Aug 2017]

    Neutron matter within QCD sum rules

    Bao-Jun Cai🇨🇳 · Lie-Wen Chen🇨🇳

    Equation of state (EOS) of pure neutron matter (PNM) is studied in QCD sum rules (QCDSR). It is found that the QCDSR results on EOS of PNM are in good agreement with predictions by current advanced microscopic many-body theories. Moreover, the higher-order density terms in quark condensates are shown to be important to describe the empirical EOS of PNM in the density region around and above nuclear saturation density although they play minor role at subsaturation densities. The chiral condensates in PNM are also studied, and our results indicate that the higher-order density terms in quark condensates, which are introduced to reasonably describe the empirical EOS of PNM at suprasaturation densities, tend to hinder the appearance of chiral symmetry restoration in PNM at high densities.

    Comments:
    7 pages, 2 figures. Discussions added and presentation improved. Accepted version to appear in PRC
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1708.01010 [pdf]
    PRC(2018)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE