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Nuclear Theory·nucl-th

Wednesday·February 12, 2025

4 papers—4 primary·0 cross-listed

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  1. 01

    [Submitted on 10 Feb 2025]

    QED nuclear medium effects at EIC energies

    Shohini Bhattacharya🇺🇸 · Oleksandr Tomalak🇺🇸 · Ivan Vitev🇺🇸

    We present the first calculation of quantum electrodynamics (QED) nuclear medium effects under the experimental conditions of future Electron-Ion Collider (EIC) experiments. Our work offers numerical estimates, particularly in the context of inclusive deep inelastic scattering on a nucleus. While prior studies have predominantly focused on elastic scattering, our investigation extends to the more complex scenarios of inelastic processes within a nuclear medium. Our findings suggest that the cross-section corrections due to QED nuclear medium effects could be substantial, reaching or exceeding the level of experimental precision. This work further compares the effects of single re-scattering events with those of multiple re-scatterings, as particles travel the nuclear volume. We estimate the dominant source of the uncertainties associated with our formalism by varying the scale of the atomic physics where the screening of the electric field of the nucleus happens. This calculation not only contributes to the understanding of QED nuclear medium effects, but also offers a path to a more precise extraction of the process-independent non-perturbative structure of nuclei.

    Comments:
    16 pages, 8 figures, version published in Physical Review D, figures 3-6 updated, a reference added
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2502.06943 [pdf]
    PRD(2025)·2 citations
  2. 02

    [Submitted on 10 Feb 2025]

    Electric dipole excitations near the neutron separation energies in Mo

    Eun Jin In🇺🇸 · Emanuel Chimanski🇺🇸 · Jutta Escher🇺🇸 · Sophie Péru🇫🇷 · Aaina Thapa🇺🇸 · Walid Younes🇺🇸

    Electric dipole strength near the neutron separation energy significantly impacts nuclear structure properties and astrophysical scenarios. These excitations are complex in nature and may involve the so-called pygmy dipole resonance (PDR). Transition densities play a crucial role in understanding the nature of nuclear excited states, including collective excitations, as well as in constructing transition potentials in DWBA or coupled-channels equations. In this work, we focus on electric dipole excitations in spherical molybdenum isotopes, particularly Mo, employing fully consistent Hartree-Fock-Bogoliubov (HFB) and Quasiparticle Random Phase Approximation (QRPA) methods. We analyze the dipole strength near the neutron separation energy, which represents the threshold for neutron capture processes, and examine the isospin characteristics of PDR states through transition density calculations. Examination of proton and neutron transition densities reveals distinctive features of each dipole state, indicating their isoscalar and isovector nature. We observe that the primary component in the enhanced low-energy region exhibits isovector character. The PDR displays a mixture of isoscalar and isovector nature, distinguishing it from the isovector giant dipole resonance (IVGDR). These findings lay the groundwork for future investigations into the role of transition densities in reaction models and for their application to inelastic scattering calculations.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.07113 [pdf]
    EPJ Web Conf.(2025)·1 citation
  3. 03

    [Submitted on 11 Feb 2025]

    He cluster structure in C

    Ying-Yu Cao · De-Ye Tao · Bo Zhou · Yu-Gang Ma

    We study the He cluster structure of C within the microscopic cluster model. The calculations essentially reproduce the energy spectra for both negative and positive parity states, particularly the state near the +He threshold. We also calculate the isoscalar monopole, electric quadrupole transition strengths, and root-mean-square radii for the low-lying states. These results suggest that the , , and states have a well-developed + He cluster structure. The analysis of the generator coordinate method wave functions indicates the dilute gaslike nature for the , , and states, suggesting that they could be candidates for the Hoyle-analog state. Furthermore, it is found that the and states may possess a linear chain structure.

    Comments:
    12 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.07261 [pdf]
    PRC(2025)·0 citations
  4. 04

    [Submitted on 11 Feb 2025]

    Moments of inertia of rare-earth nuclei and the nuclear time-odd mean fields within exact solutions of the adiabatic theory

    Xuwei Sun · Jacek Dobaczewski · Markus Kortelainen · Jhilam Sadhukhan · Adrián Sánchez-Fernández · Herlik Wibowo

    We systematically analyse the nuclear moments of inertia determined within the Skyrme and Gogny density functional theories. The time-odd mean fields generated by collective rotation are self-consistently determined by a novel exact iterative solution of the adiabatic time-dependent Hartree-Fock-Bogoliubov (ATDHFB) equations. Although details of the results depend on the functional used, the calculated moments of inertia are in good overall agreement with the experimental data, with no adjustable parameters. To show the essential importance of the time-odd mean fields, we compared the ATDHFB moments of inertia with those obtained from the Inglis-Belyaev formula. For Skyrme density functionals, we find strong correlations between the effective mass and the impact of the time-odd mean fields on the rotational and vibrational collective inertia.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.07433 [pdf]
    PLB(2025)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE