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Nuclear Theory·nucl-th

Tuesday·January 7, 2020

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    [Submitted on 5 Jan 2020]

    Proposals for the test of the isospin invariance in the pion-nucleon interaction at low energy

    Evangelos Matsinos · Günther Rasche

    This work elaborates on former remarks of ours regarding two sets of predictions for the observables of the charge-exchange reaction at low energy (pion laboratory kinetic energy MeV). The first prediction is obtained via the triangle identity from the results of fits to low-energy elastic-scattering data, whereas the second is based on the same analysis of the combined low-energy and charge-exchange databases. Assuming the integrity of the data used in our fits (i.e., the absence of significant systematic effects in the determination of the absolute normalisation of the datasets) and the insignificance of residual effects in the electromagnetic corrections, a significant difference between these two sets of predictions may be interpreted as departure from the isospin invariance in the low-energy interaction. We examine the sensitivity of the standard low-energy observables to the effect, and identify the kinematical regions which are promising for experimental survey. Accurate experiments under the suggested conditions will differentiate between the predictions, and thus provide an independent test of the isospin invariance in the low-energy interaction.

    Comments:
    11 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2001.01229 [pdf]
    0 citations
  2. 02

    [Submitted on 6 Jan 2020]

    Vorticity in low-energy heavy-ion collisions

    Xian-Gai Deng🇨🇳 · Xu-Guang Huang🇨🇳 · Yu-Gang Ma🇨🇳 · Song Zhang🇨🇳

    We study the kinematic and thermal vorticities in low-energy heavy-ion collisions by using the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model. We explore their time evolution and spatial distribution. We find that the initial vorticities have a non-monotonic dependence on the collision energy : as grows the vorticities first increase steeply and then decrease with the turning point around GeV depending on the centrality.

    Comments:
    V2: 5 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2001.01371 [pdf]
    PRC(2020)·103 citations
  3. 03

    [Submitted on 6 Jan 2020]

    Atomic nuclei from quantum Monte Carlo calculations with chiral EFT interactions

    Stefano Gandolfi🇺🇸 · Diego Lonardoni🇺🇸 · Alessandro Lovato🇺🇸 · Maria Piarulli🇺🇸

    Quantum Monte Carlo methods are powerful numerical tools to accurately solve the Schrödinger equation for nuclear systems, a necessary step to describe the structure and reactions of nuclei and nucleonic matter starting from realistic interactions and currents. These ab-initio methods have been used to accurately compute properties of light nuclei -- including their spectra, moments, and transitions -- and the equation of state of neutron and nuclear matter. In this work we review selected results obtained by combining quantum Monte Carlo methods and recent Hamiltonians constructed within chiral effective field theory.

    Comments:
    36 pages, 9 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2001.01374 [pdf]
    Front.Phys.(2020)·83 citations
  4. 04

    [Submitted on 6 Jan 2020]

    Approach to thermalization and hydrodynamics

    Yukinao Akamatsu🇯🇵

    I review recent progress in thermalization in heavy-ion collisions, with particular emphasis on hydrodynamic attractor, and also report recent progress in hydrodynamic fluctuations.

    Comments:
    8 pages, 3 figures, Proceedings for Quark Matter 2019
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2001.01429 [pdf]
    NPA(2021)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE