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Nuclear Theory·nucl-th

Thursday·April 11, 2019

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    [Submitted on 10 Apr 2019]

    Squeezed back-to-back correlations of bosons with nonzero widths in relativistic heavy-ion collisions

    Peng-Zhi Xu🇨🇳 · Wei-Ning Zhang🇨🇳

    We derive the formulas for calculating the squeezed back-to-back correlation (SBBC) between a boson and antiboson with nonzero width produced in relativistic heavy-ion collisions. The SBBCs of and mesons with finite in-medium widths are studied. We find that the finite width can change the pattern of the SBBC function of with respect to mass. However, the SBBC function of is insensitive to the width. In the high-particle-momentum region, the SBBC function of increases with particle momentum rapidly and can exceed that of whether the width is nonzero or not.

    Comments:
    5 pages, 2 figures, accepted for publication in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1904.04974 [pdf]
    PRC(2019)·4 citations
  2. 02

    [Submitted on 10 Apr 2019]

    Towards an ab initio covariant density functional for nuclear structure

    Shihang Shen🇨🇳 · Haozhao Liang🇯🇵 · Wen Hui Long🇨🇳 · Jie Meng🇯🇵 · Peter Ring🇨🇳

    Nuclear structure models built from phenomenological mean fields, the effective nucleon-nucleon interactions (or Lagrangians), and the realistic bare nucleon-nucleon interactions are reviewed. The success of covariant density functional theory (CDFT) to describe nuclear properties and its influence on Brueckner theory within the relativistic framework are focused upon. The challenges and ambiguities of predictions for unstable nuclei without data or for high-density nuclear matter, arising from relativistic density functionals, are discussed. The basic ideas in building an ab initio relativistic density functional for nuclear structure from ab initio calculations with realistic nucleon-nucleon interactions for both nuclear matter and finite nuclei are presented. The current status of fully self-consistent relativistic Brueckner-Hartree-Fock (RBHF) calculations for finite nuclei or neutron drops (ideal systems composed of a finite number of neutrons and confined within an external field) is reviewed. The guidance and perspectives towards an ab initio covariant density functional theory for nuclear structure derived from the RBHF results are provided.

    Comments:
    67 pages, 26 figures, version accepted for publication in "Progress in Particleand Nuclear Physics"
    Subjects:
    Nuclear Theory (nucl-th); Strongly Correlated Electrons (cond-mat.str-el); High Energy Physics — Lattice (hep-lat)
    arXiv:
    1904.04977 [pdf]
    PPNP(2019)·133 citations
  3. 03

    [Submitted on 10 Apr 2019]

    Role of consistent parameter sets in an assessment of the alpha-particle optical potential below the Coulomb barrier

    V. Avrigeanu · M. Avrigeanu

    Background: Further studies of high-precision measurements of alpha-induced reaction data below the Coulomb barrier have still raised questions about the alpha-particle optical model potential (OMP) within various mass ranges, i.e. for 64Zn, 108Cd, 113,115In, 121,123Sb, and 191,193Ir target nuclei. Purpose: The accuracy as well as eventual uncertainties and/or systematic errors of using a previous optical potential are much better considered by analysis of such accurate data. Method: Statistical model (SM) calculations of the (alpha,x) reaction cross sections have been carried out using model parameters which were previously obtained by analyzing independent data, particularly gamma-ray strength functions, and taking into account their uncertainties and questions of extrapolation for nuclei without similar data. Results: Consistent description of the recent alpha-induced reaction data is provided by the above-mentioned optical potential with no empirical rescaling factors of either its own parameters or the gamma and/or nucleon widths. Effects of still uncertain SM parameters on calculated alpha-induced reaction cross sections and conclusions on the alpha-OMP can be now discussed due to unprecedented precision of the new data. Conclusions: The alpha-particle optical potential has been confirmed at incident energies below the Coulomb barrier using statistical-model parameters validated through a former analysis of independent data.

    Comments:
    14 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1904.05140 [pdf]
    PRC(2019)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE