PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·August 31, 2022

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 01

    [Submitted on 30 Aug 2022]

    Ground state correlations on ground state densities and total binding energies of 40Ca, 48Ca and 208Pb

    F. Minato · H. Sagawa · S. Yoshida

    Neutron and proton densities of doubly-closed shell nuclei 40Ca, 48Ca and 208Pb are studied based on a Hartree-Fock model with SAMi, SAMi-J27 and SAMi-T energy density functionals (EDFs). The ground state correlations (GSC) induced by isoscalar and isovector phonons are also evaluated by the second order perturbation theory with a self-consistent random phase approximation (RPA). We found that the interior part of the ground state densities is reduced by the GSC in consistent with the experimental data. On the other hand, the GSC enhances the neutron skin thickness of 48Ca and 208Pb. The effect of GSC on the total binding energy is also evaluated by the quasi-boson approximation. The effect of the tensor interaction is found small on both the density distributions and the binding energies.

    Comments:
    13 pages, 5 figures, 3 tables
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2208.13938 [pdf]
    1 citation
  2. 02

    [Submitted on 30 Aug 2022]

    Multi-task learning on nuclear masses and separation energies with the kernel ridge regression

    X.H. Wu · Y.Y. Lu · P.W. Zhao

    A multi-task learning (MTL) framework, called gradient kernel ridge regression, for nuclear masses and separation energies is developed by introducing gradient kernel functions to the kernel ridge regression (KRR) approach. By taking the WS4 mass model as an example, the gradient KRR network is trained with the mass model residuals, i.e., deviations between experimental and theoretical values of masses and one-nucleon separation energies, to improve the accuracy of theoretical predictions. Significant improvements are achieved by the gradient KRR approach in both the interpolation and the extrapolation predictions of nuclear masses and separation energies. This demonstrates the advantage of the present MTL framework that integrates the information of nuclear masses and separation energies and improves the predictions for both of them.

    Comments:
    3 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2208.13966 [pdf]
    PLB(2022)·51 citations
  3. 03

    [Submitted on 30 Aug 2022]

    Neutrino propagation in the neutron star with uncertainties from nuclear, hadron, and particle physics

    Parada T. P. Hutauruk🇰🇷 · Hana Gil🇰🇷 · Seung-il Nam🇰🇷 · Chang Ho Hyun🇰🇷

    In the present work, we investigate the neutral-current neutrino-nucleon scattering in the nuclear medium using various energy-density functional (EDF) models such as the KIDS (Korea-IBS-Daegu-SKKU) and SLy4, together with the quark-meson coupling (QMC) model for the nucleon form factors at finite density. The differential cross section (DCS) and neutrino mean free path (NMFP) are computed numerically, considering the density-dependent nucleon form factors (DDFF) and neutrino structural properties such as the neutrino magnetic moment (NMM) and its electric charge radius (NCR). It turns out that the DDFF decreases the scattering cross-section, while the NCR increases it considerably. The effect of the NMM turns out to be almost negligible. We also observe that the value of the neutron effective mass is of importance in the neutron-star cooling process, indicating that for the neutron effective mass larger than the mass in free space, the neutrino can interact with matter at densities in the neutron star with radius 13 km.

    Comments:
    16 pages, 2 tables, 12 figures, published version of PTEP Journal
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2208.13971 [pdf]
    PTEP(2023)·2 citations
  4. 04

    [Submitted on 30 Aug 2022]

    Partonic Critical Opalescence and Its Impact on the Jet Quenching Parameter

    Jing Wu🇨🇳 · Shanshan Cao🇨🇳 · Feng Li🇨🇳

    Jet quenching parameter is essential for characterizing the interaction strength between jet partons and nuclear matter. Based on the quark-meson (QM) model, we develop a new framework for calculating at finite chemical potentials, in which is related to the spectral function of the chiral order parameter. A perturbative calculation up to the one-loop order indicates that the momentum broadening of jets is enhanced at both the high temperature and high chemical potential, and approximately proportional to the parton number density in the partonic phase. We further investigate the behavior of in the vicinity of the critical endpoint (CEP) by coupling our calculation with a recently developed equation of state that includes a CEP in the universality class of the Ising model, from which we discover the partonic critical opalescence (PCO) -- a prominent enhancement of the momentum broadening of jets near CEP, contributed by the scatterings via the exchange process. Hence, for the first time, jet quenching is connected with the search of CEP.

    Comments:
    6 pages,6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2208.14297 [pdf]
    Chin.Phys.Lett.(2024)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE