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Nuclear Theory·nucl-th

Wednesday·February 19, 2025

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 01

    [Submitted on 15 Feb 2025]

    Chiral Symmetry in Dense Matter with Meson Condensation

    Takumi Muto🇯🇵 · Toshiki Maruyama🇯🇵 · Toshitaka Tatsumi🇯🇵

    Kaon condensation in hyperon-mixed matter [(+) phase], which may be realized in neutron stars, is discussed on the basis of chiral symmetry. With the use of the effective chiral Lagrangian for kaon--baryon and kaon--kaon interactions; coupled with the relativistic mean field theory and universal three-baryon repulsive interaction, we clarify the effects of the -wave kaon--baryon scalar interaction simulated by the kaon--baryon sigma terms and vector interaction (Tomozawa--Weinberg term) on kaon properties in hyperon-mixed matter, the onset density of kaon condensation, and the equation of state with the (+) phase. In particular, the quark condensates in the (+) phase are obtained, and their relevance to chiral symmetry restoration is discussed.

    Comments:
    22 pages, 7 figures, published in Symmetry 2025,17,270, the Special Issue: Chiral Symmetry, and Restoration in Nuclear Dense Matter. arXiv admin note: substantial text overlap with arXiv:2411.09967
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2502.12192 [pdf]
    Symmetry(2025)·3 citations
  2. 02

    [Submitted on 18 Feb 2025]

    Analytic continuation in coupling constant applied to two-proton emitters

    Tomohiro Oishi · Masaaki Kimura

    For quantum meta-stable problems with three particles, the Be and Ne nuclei as two-proton () emitters provide a testing field. Considering the complexity of many-body meta-stable systems, a tractable solver has been on demand. We apply the analytic continuation in coupling constant (ACCC) to these nuclei, and confirm that this method can solve such problems consistently to the time-dependent results as well as to the experimental data. The sensitivity of the energies and widths to the proton-proton interaction is also investigated. The Be shows a smooth shift from short-life to long-life systems according to the proton-proton interaction. Same is concluded for the resonance of Ne. In contrast, for the first and second resonances of Ne, their energies and widths show the avoid-crossing behaviour, due to the coupling of two configurations in the core-proton subsystem, F. Since it requires only the bound-state solvers, the ACCC can be a low-cost option to solve three or more-body resonances.

    Comments:
    6 pages, 6 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.12577 [pdf]
    PRC(2025)·1 citation
  3. 03

    [Submitted on 18 Feb 2025]

    AC nuclear Stark effect in H-atom via super-intense laser-atom interaction

    Ali Raza Mirza · Rizwan Abbas · Atif Shahbaz

    We investigate the nuclear Stark effect induced in hydrogen-like atomic nuclei under super-intense laser fields. Since laser wavelengths are generally larger than nuclear dimensions, direct laser-nucleus interaction is unfeasible. Instead, this effect is induced indirectly through electron oscillations in the laser field, which produce a periodic electric field that shifts the nuclear energy levels. Using perturbation theory, we derive an expression for the energy shift and dynamic polarizability of the nucleus as a function of laser parameters. Our findings reveal that the Nuclear Stark effect can be controlled by adjusting the laser frequency and intensity, potentially enabling applications in nuclear and quantum optical systems.

    Comments:
    4 Pages, 3 Figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2502.12683 [pdf]
    0 citations
  4. 04

    [Submitted on 18 Feb 2025]

    Initial-state-driven spin correlations in high-energy nuclear collisions

    Giuliano Giacalone🇨🇭 · Enrico Speranza🇨🇭

    In the study of spin-polarization phenomena in heavy-ion collisions, it is typically assumed that final-state particles are polarized through thermal vorticity and shear. In this sense, polarization is a final-state effect. Here, we propose a different mechanism. We postulate that the collision of spin-carrying nucleons generates an initial transverse spin density, inducing a net polarization of the QCD fireball along a random direction. If the net spin is conserved throughout the evolution of the fireball, the final-state particles should exhibit measurable polarization. Within a wounded nucleon picture, we estimate that initial-state fluctuations induce a net polarization of baryons which is around in central collisions and over in noncentral collisions, significantly exceeding the contributions from thermal vorticity and shear. We introduce a two-particle angular correlation observable designed to reveal initial net-spin fluctuations, and emphasize the main signatures to look for in experiments. We argue that the discovery of these phenomena would have profound implications for nuclear structure and our understanding of spin in relativistic hydrodynamics.

    Comments:
    10 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2502.13102 [pdf]
    12 citations

Affiliations

first authorsco-authorsvia INSPIRE