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Nuclear Theory·nucl-th

Wednesday·December 6, 2023

11 papers—3 primary·8 cross-listed

All11Primary3Cross-lists8
  1. 01

    [Submitted on 5 Dec 2023]

    Difference in peripherality of the inclusive (p, p'x) and (d, d'x) reactions and its implications for phenomenological reaction model

    Hibiki Nakada · Shinsuke Nakayama · Kazuki Yoshida · Yukinobu Watanabe · Kazuyuki Ogata

    Previous studies have revealed the importance of introducing surface correction into a phenomenological model for inclusive (n, n'x) and (p, p'x) reactions. These findings have contributed significantly to the improvement of nuclear data evaluation. However, the necessity for the surface correction in an inclusive (d, d'x) reaction has hardly been investigated. The purpose of this study is to investigate the difference in the peripherality of the (p, p'x) and (d, d'x) reactions by a theoretical analysis using a quantum mechanical model, and to obtain a theoretical basis on the surface correction in the (d, d'x) reaction. The energy spectra and their radial distributions for the (p, p'x) and (d, d'x) reactions are calculated by the one-step semiclassical distorted wave model. The radial distribution of the energy spectra for the (d, d'x) reaction is shifted toward the outer region of the nucleus compared to the (p, p'x) reaction. Based on this finding, we consider a larger surface correction into a phenomenological model for the (d, d'x) reaction than that for the (p, p'x) reaction, and calculated values reproduce the experimental (d, d'x) spectra well. The peripherality of the (d, d'x) reaction is more prominent than that of the (p, p'x) reaction. The stronger surface correction thus should be introduced for the (d, d'x) reaction than for the (p, p'x) reaction.

    Comments:
    8 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2312.02502 [pdf]
    PRC(2024)·0 citations
  2. 02

    [Submitted on 5 Dec 2023]

    Conserved energy-momentum tensor for real-time lattice simulations

    Kirill Boguslavski🇦🇹 · Tuomas Lappi🇫🇮 · Jarkko Peuron🇫🇮 · Pragya Singh🇫🇮

    We derive an expression for the energy-momentum tensor in the discrete lattice formulation of pure glue QCD. The resulting expression satisfies the continuity equation for energy conservation up to numerical errors with a symmetric procedure for the time discretization. In the case of the momentum conservation equation, we obtain an expression that is of higher accuracy in lattice spacing () than the naive discretization where fields in the continuum expressions are replaced by discretized counterparts. The improvements are verified by performing numerical tests on the derived expressions using classical real-time lattice gauge theory simulations. We demonstrate substantial reductions in relative error of one to several orders of magnitude compared to a naive discretization for both energy and momentum conservation equations. We expect our formulation to have applications in the area of pre-equilibrium dynamics in ultrarelativistic heavy ion collisions, in particular for the extraction of transport coefficients such as shear viscosity.

    Comments:
    19 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2312.02726 [pdf]
    EPJC(2024)·1 citation
  3. 03

    [Submitted on 5 Dec 2023]

    High- isomers in a self-consistent mean-field approach with the Gogny force

    L.M. Robledo

    High- isomeric states in even-even and odd-mass nuclei are described within a mean-field framework with full blocking and using the finite range Gogny force. Theoretical calculations of low energy spectra of several nuclei across the nuclear chart are compared with equal filling approximation results and experimental data. Despite the global character of the employed interactions, a good agreement between the different many-body methods and experimental data is found.

    Comments:
    12 pages
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2312.02729 [pdf]
    J.Phys.G(2024)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE