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Nuclear Theory·nucl-th

Monday·January 15, 2024

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    [Submitted on 12 Jan 2024]

    Spin squeezed states and wobbling motion in collective Hamiltonian

    Q. B. Chen · S. Frauendorf

    A semiclassical approach is proposed to calculate the collective potential and mass parameters to formulate a collective Hamiltonian capable of describing the wobbling motion in both even-even and odd-mass systems. By diagonalizing the resulting collective Hamiltonian (CH), one can obtain the energies and wave functions associated with the wobbling states. Furthermore, a novel technique called spin squeezed state (SSS) maps is introduced based on the derived wave functions. To validate the results obtained from the collective Hamiltonian, a comparative analysis is conducted against predictions from the triaxial rotor model (TRM) and particle triaxial rotor (PTR) model. Notably, the SSS plots determined using the TRM and PTR models exhibit a strong correlation with the probability density distributions of the wave functions obtained from the CH. This correlation highlights the consistency and coherence between the different theoretical approaches when describing the wobbling phenomenon and associated rotational dynamics.

    Comments:
    submitted to PRC
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2401.06460 [pdf]
    PRC(2024)·11 citations
  2. 02

    [Submitted on 12 Jan 2024]

    Multinucleon transfer with time-dependent covariant density functional theory

    D. D. Zhang · D. Vretenar · T. NikšIć · P. W. Zhao · J. Meng

    The microscopic framework of time-dependent covariant density functional theory is applied to study multinucleon transfer reactions, with transfer probabilities calculated using the particle number projection method. It is found that similar total cross sections are obtained with two different relativistic density functionals, PC-PK1 and DD-ME2, as well as with the Skyrme functional SLy5 in a previous study, for multinucleon transfer in the reactions: at MeV, at MeV, and at MeV. We report the first microscopic calculation of total cross sections for the reactions: at MeV and at MeV. Compared to the results obtained with the GRAZING model, the cross sections predicted by the time-dependent covariant density functional theory are in much better agreement with data, and demonstrate the potential of microscopic models based on relativistic density functionals for the description of reaction dynamics.

    Comments:
    20 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2401.06539 [pdf]
    PRC(2024)·26 citations
  3. 03

    [Submitted on 12 Jan 2024]

    Neutron-rich nuclei and neutron skins from chiral low-resolution interactions

    P. Arthuis · K. Hebeler · A. Schwenk

    Neutron-rich nuclei provide important insights to nuclear forces and to the nuclear equation of state. Advances in ab initio methods combined with new opportunities with rare isotope beams enable unique explorations of their properties based on nuclear forces applicable over the entire nuclear chart. In this paper, we develop novel chiral low-resolution interactions that accurately describe bulk properties from O to Pb. With these, we investigate density distributions and neutron skins of neutron-rich nuclei. Our results show that neutron skins are narrowly predicted over all nuclei with interesting sensitivities for the most extreme, experimentally unexplored cases.

    Comments:
    10 pages, 8 figures, 3 tables including appendices
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2401.06675 [pdf]
    EPJA(2026)·57 citations
  4. 04

    [Submitted on 12 Jan 2024]

    An analytic approach to the RTA Boltzmann attractor

    Inês Aniceto🇬🇧 · Jorge Noronha🇺🇸 · Michał\ Spaliński🇵🇱

    We reformulate the Boltzmann equation in the relaxation time approximation undergoing Bjorken flow in terms of a novel partial differential equation for the generating function of the moments of the distribution function. This is used to obtain an approximate analytic description of this system's far-from-equilibrium attractor via a series expansion at early times. This expansion possesses a finite radius of convergence and can be analytically continued to late times. We find that this procedure reproduces the known values of shear viscosity and other transport coefficients to high accuracy. We also provide a simple approximate analytic expression that describes the attractor in the entire domain of interest for studies of quark-gluon plasma dynamics.

    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2401.06750 [pdf]
    PRD(2025)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE