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Nuclear Theory·nucl-th

Monday·March 10, 2025

8 papers—4 primary·4 cross-listed

All8Primary4Cross-lists4
  1. 01

    [Submitted on 7 Mar 2025]

    Mirror-skin thickness: a possible observable sensitive to the charge symmetry breaking energy density functional

    Tomoya Naito · Yuto Hijikata · Juzo Zenihiro · Gianluca Colò · Hiroyuki Sagawa

    We propose a new observable, named the mirror-skin thickness, in order to extract the strength of the charge symmetry breaking (CSB) term in an energy density functional (EDF). The mirror-skin thickness of isotones and isotopes is studied by using Hartree-Fock-Bogoliubov (HFB) calculations with various Skyrme EDFs and adding CSB and charge independence breaking (CIB) terms. It is shown that the mirror-skin thickness is sensitive only to the CSB EDF, but hardly depends on either the isospin symmetric part of the nuclear EDF or the CIB term. Therefore, this observable can be used to extract the magnitude of the CSB term in the EDF quantitatively, either from experimental data or ab initio calculations. We have studied the accuracy in the mirror-skin thickness that is needed to extract sensible information. Our study may also help to understand the inconsistency between the strength of the phenomenological CSB and that extracted from ab initio calculations [Naito et al. Nuovo. Cim. C 47, 52 (2024)]. Among possible mirror pairs for experimental study, we propose the mirror-skin thickness between and , which could be accessed in future experiments in RIBF and/or FRIB.

    Comments:
    14 pages, 13 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2503.05147 [pdf]
    EPJA(2025)·3 citations
  2. 02

    [Submitted on 7 Mar 2025]

    Electromagnetic emission from strongly interacting hadronic and partonic matter created in heavy-ion collisions

    Adrian William Romero Jorge🇩🇪 · Taesoo Song🇩🇪 · Qi Zhou🇨🇳 · Elena Bratkovskaya🇩🇪

    We investigate dilepton production in heavy-ion, proton-proton, and proton-nucleus collisions from low energies of 1 AGeV (SIS) to ultra-relativistic energies (LHC) using the Parton-Hadron-String Dynamics (PHSD) transport approach. PHSD is a microscopic, non-equilibrium approach that integrates hadronic and partonic degrees of freedom, providing a comprehensive description of relativistic heavy-ion collisions from initial nucleon-nucleon interactions to quark-gluon plasma (QGP) formation, hadronization, and final-state interactions. Key dilepton sources in PHSD include hadronic decays, bremsstrahlung, QGP radiation (, \ , \ ), primary Drell-Yan production, and semileptonic decays of correlated charm and bottom pairs. PHSD well describes dilepton data from HADES, STAR, and ALICE experiments. We examine in-medium effects, such as the vector meson spectral function broadening, and present the excitation function for the dilepton "excess" in the invariant mass range GeV/c. For the first time we report on the baryon chemical potential -dependence of the QGP radiation calculated on a basis of the Dynamical-Quasi-Particle Model (DQPM) in PHSD. The influence of on the QGP yield grows at lower collision energies, where becomes large, however, its impact on the total dilepton spectra is small due to the lowering of the QGP volume with decreasing energy. The excitation function of QGP dileptons, is presented versus correlated charm, confirming that the QGP radiation overshines charm contributions at GeV in central Au+Au collisions, providing access to thermal QGP dileptons at BES RHIC and FAIR.

    Comments:
    extended version (29 pages, 24 figures) to be published in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2503.05253 [pdf]
    PRC(2025)·13 citations
  3. 03

    [Submitted on 7 Mar 2025]

    Calculation of low-energy scattering parameters using artificial oscillator trap

    D.V.Fedorov · A.M.Pedersen

    We introduce a recipe to estimate the low-energy scattering parameters of a quantum few-body system - scattering length, effective range, and shape parameter - by using only discrete state calculations. We place the system in an artificial oscillator trap of appropriate size and calculate the energies of the resulting discrete states close to the threshold of the system. The low-energy scattering parameters are then extracted - using a simple analytic formula - from the functional dependence of these energies upon the trap size. We first test the recipe against a simple model problem and then apply it to low-energy nucleon-nucleon scattering within the nuclear Model with Explicit Mesons in one sigma-meson approximation.

    Comments:
    Extra references added, a few sentences rephrased
    Subjects:
    Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2503.05295 [pdf]
    Few Body Syst.(2025)·1 citation
  4. 04

    [Submitted on 7 Mar 2025]

    Mass fractions in stellar interior during presupernova evolution

    Jameel-Un Nabi · Abdel Nasser Tawfik · Nada Ezzelarab · Ali Abas Khan

    We assume nuclear statistical equilibrium (NSE) conditions and use Saha Equation to calculate mass fractions in stellar interior during presupernova evolution of massive stars. Our ensemble contains 728 nuclei. The distinguishing feature of our calculation is a state by state summation of nuclear level densities up to 10 MeV for all nuclei considered in our ensemble. This leads to a more realistic description of nuclear partition function which poses one of the largest uncertainties in the mass fraction calculations under conditions of NSE. The Coulomb correction term was taken into account for the calculation of ground state binding energies of the nucleons. Our calculated mass fractions are up to four orders of magnitude smaller than previous calculation. The current calculation could prove useful for study of stellar matter during presupernova phases of massive stars.

    Comments:
    14 Pages, 4 Table , 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2503.05517 [pdf]
    Astrophys.Space Sci.(2016)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE