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Nuclear Theory·nucl-th

Wednesday·November 8, 2023

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 01

    [Submitted on 6 Nov 2023]

    Chiral catalysis of nuclear fusion in molecules

    Dmitri E. Kharzeev · Jake Levitt

    At low energies, nuclear fusion is strongly affected by electron screening of the Coulomb repulsion among the fusing nuclei. It may thus be possible to catalyze nuclear fusion in molecules (i.e., to fuse specific nuclei in situ) through quantum control of electron wave functions in intense laser fields. The circularly polarized (chiral) laser field can effectively squeeze the electron wave functions, greatly enhancing the screening in the spatial region relevant for the fusion process. We estimate the corresponding fusion probabilities, and find that the proposed chiral catalysis of nuclear fusion in molecules may be observable, potentially with important practical applications.

    Comments:
    5 pages
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2311.03492 [pdf]
    IJMPE(2024)·1 citation
  2. 02

    [Submitted on 6 Nov 2023]

    Describing the Thermal Radiation in Collisions at 200 GeV by an Analytic Solution of Relativistic Hydrodynamics

    Gábor Kasza🇭🇺

    In high-energy heavy-ion collisions a nearly perfect fluid, the so-called strongly coupled quark gluon plasma forms. After the short period of thermalisation, the evolution of this medium can be described by the laws of relativistic hydrodynamics. The time evolution of the quark gluon plasma can be understood through direct photon spectra measurements, which are sensitive to the entire period between the thermalisation and the freeze-out of the medium. I present a new analytic formula that describes the thermal photon radiation and it is derived from an exact and finite solution of relativistic hydrodynamics with accelerating velocity field. Then I compare my calculations to the most recent nonprompt spectrum of direct photons for at 200 GeV collisions. I have found a convincing agreement between the model and the data, which allows to give an estimate of the initial temperature in the center of the fireball. My results predict hydrodynamic scaling behaviour for the thermal photon spectra of high-energy heavy-ion collisions.

    Comments:
    13 pages, 2 figures. This paper is accepted for publication in International Journal of Modern Physics A
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2311.03568 [pdf]
    Int.J.Mod.Phys.A(2024)·4 citations
  3. 03

    [Submitted on 7 Nov 2023]

    Odd nuclei and quasiparticle excitations within the Barcelona Catania Paris Madrid energy density functional

    S.A. Giuliani · L.M. Robledo

    An extension of the Barcelona Catania Paris Madrid (BCPM) energy density functional is proposed to deal with odd-mass systems as well as multiquasiparticle excitations. The extension is based on the assumption that the equal filling approximation (EFA) is a valid alternative to the traditional full blocking procedure of the Hartree-Fock-Bogoliubov method. The assumption is supported by the excellent agreement between full blocking and EFA calculations obtained with different parametrizations of the Gogny interaction. The EFA augmented BCPM functional is used to compute low energy excitation spectra of selected nuclei in different regions of the nuclear chart, and high- isomers in Hf. We show that BCPM predictions are in good agreement with Gogny D1M results and experimental data.

    Comments:
    11 Pages, 9 Figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2311.03882 [pdf]
    PRC(2024)·3 citations
  4. 04

    [Submitted on 7 Nov 2023]

    Estimate magnetic field strength in heavy-ion collisions via the direct photon elliptic flow

    Jing-An Sun🇨🇳 · Li Yan🇨🇳

    There must be electromagnetic fields created during high-energy heavy-ion collisions. As the quark-gluon plasma (QGP) starts to evolve hydrodynamically, although these fields may become weak comparing to the energy scales of the strong interaction, they are potentially important to some electromagnetic probes. In this work, we focus on the dissipative corrections in QGP due to the presence of a weak external magnetic field, and calculate accordingly the induced photon radiation in the framework of viscous hydrodynamics. By event-by-event hydrodynamical simulations, the experimentally measured direct photon elliptic flow can be well reproduced. Correspondingly, the direct photon elliptic flow implies a magnetic field strength around 0.1 G. This is indeed a weak field in heavy-ion physics that is compatible to the theoretical predictions, however, it is still an ultra-strong magnetic field in nature.

    Comments:
    version accepted by PRC
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2311.03929 [pdf]
    PRC(2024)·20 citations
  5. 05

    [Submitted on 7 Nov 2023]

    Algebraic solutions for quantum phase transitions in the proton-neutron interacting boson model

    M. M. Hammad · Andriana Martinou · Dennis Bonatsos

    A simple systematic procedure to construct the proton-neutron unitary, , orthogonal, , and quasi-spin algebras of the sd bosonic system is presented. New algebraic substructures of these algebras are discussed and the explicit formulae for their generators and Casimir operators are given in the spherical tensor form. The complementarity relationship of the Casimir operators of the and is derived. The exact algebraic solutions of the quantum phase transition Hamiltonian between the and limits has been considered, for the first time, in the framework of affine Lie algebra. The low lying energy spectra of the isotopes are calculated using the transition Hamiltonian. The good agreement of our computation with empirical result in these isotopes emphasizes the importance of limit. With this addition, symmetry can be extended to many nuclei.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2311.03960 [pdf]
    NPA(2022)·1 citation
  6. 06

    [Submitted on 7 Nov 2023]

    An extended Skyrme momentum dependent potential in asymmetric nuclear matter and transport models

    Junping Yang🇨🇳 · Xiang Chen🇨🇳 · Ying Cui🇨🇳 · Yangyang Liu🇨🇳 · Zhuxia Li🇨🇳 · Yingxun Zhang🇨🇳

    Based on an extended Skyrme momentum-dependent interaction (MDI), we derive an isospin asymmetric equation of state, isospin-dependent single-particle potential and the Hamiltonian which can be used in the Boltzmann-Uehling-Uhlenbeck (BUU) model and the quantum molecular dynamics (QMD) model at the beam energy less than 1 GeV/u. As an example of the applications of extended Skyrme MDI, we also present the results obtained with the extended Skyrme momentum-dependent interaction in the improved quantum molecular dynamics model (ImQMD), and the influence of the effective mass splitting on the isospin sensitive observables, i.e., the single and double neutron-to-proton ratios, is discussed again.

    Comments:
    19 pages, 7 figures, accepted by Phys.Rev.C
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2311.04026 [pdf]
    PRC(2024)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE