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Nuclear Theory·nucl-th

Thursday·October 26, 2023

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 01

    [Submitted on 24 Oct 2023]

    The renormalization of the shell-model GT operator starting from effective field theory for nuclear systems

    L. Coraggio🇮🇹 · N. Itaco🇮🇹 · G. De Gregorio🇮🇹 · A. Gargano🇮🇹 · Z. H. Cheng🇨🇳 · Y. Z. Ma🇨🇳 · F. R. Xu🇨🇳 · M. Viviani🇮🇹

    For the first time, we approach in this work the problem of the renormalization of the Gamow-Teller decay operator for nuclear shell-model calculations by way of many-body perturbation theory, starting from a nuclear Hamiltonian and electroweak currents derived consistently by way of the chiral perturbation theory. These are the inputs we need to construct microscopically the effective shell-model Hamiltonians and decay operators. The goal is to assess the role of both electroweak currents and many-body correlations as the origins of the well-known problem of the quenching of the axial coupling constant gA. To this end, the calculation of observables related to the Gamow-Teller transitions has been performed for several nuclear systems outside the 40Ca and 56Ni closed cores and compared with the available data.

    Comments:
    15 pages, 13 figures, 3 tables, to be published in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2310.16133 [pdf]
    PRC(2024)·25 citations
  2. 02

    [Submitted on 24 Oct 2023]

    Space-time structure of particle emission and femtoscopy scales in ultrarelativistic heavy-ion collisions

    Yu. M. Sinyukov · V. M. Shapoval · M. D. Adzhymambetov

    The analysis of the spatiotemporal picture of particle radiation in relativistic heavy-ion collisions in terms of correlation femtoscopy scales, emission and source functions allows one to probe the character of evolution of the system created in the collision. Realistic models, like the integrated hydrokinetic model (iHKM), used in the present work, are able to simulate the entire evolution process of strongly interacting matter produced in high-energy nuclear collision. The mentioned model describes all the stages of the system's evolution, including formation of the very initial state and its consequent gradual thermalization, hydrodynamic expansion and afterburner hadronic cascade, that can help researchers to figure out the specific details of the process and better understand the formation mechanisms of certain observables. In the current paper we investigate the behavior of the pion and kaon interferometry radii and their connection with emission functions in ultrarelativistic heavy-ion collisions at the Large Hadron Collider within iHKM. We are focusing on the study of the emission time scales at different energies for both particle species (pions and kaons) aiming to get deeper insight into relation of these scales and the peculiarities of the mentioned system's collective expansion and decay with the experimentally observed femtoscopy radii. One of our main interests is the problem of the total system's lifetime estimation based on the femtoscopy analysis.

    Comments:
    28 pages, 9 figures. "Author edition" of the recently published article
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2310.16233 [pdf]
    Universe(2023)·5 citations
  3. 03

    [Submitted on 25 Oct 2023]

    Pauli resonance states in light nuclei: how they appear and how they can be eliminated

    N. Kalzhigitov · V. S. Vasilevsky

    Systematic analysis of parameters and properties of the Pauli resonance states are performed for light nuclei Li, Li, Be, Be and B, which are treated as two-cluster systems. The Pauli resonance states are redundant solutions of the resonating group method appearing when one try use more advanced description of the internal structure of interacting clusters. Our calculations are performed in a standard and advanced versions of the resonating group method. The standard version employs wave functions of many-particle shell model to describe internal motion of nucleons within each cluster. The advanced version is based on three-cluster resonating group method. As in the standard version, the internal wave functions of three clusters are approximated by wave functions of many-particle shell model model. However, in advanced version one of pair of clusters forms a bound state, and third cluster is considered to interact with such state. It is found that the Pauli resonance states in nuclei under consideration have energy between 11 and 46 MeV, and their widths vary from 8 keV to 6.7 MeV. Analysis of wave functions of Pauli resonance states and matrix elements of norm kernel allowed us to formulate an effective method for eliminating Pauli resonance states. It is demonstrated that this method effectively eliminate all determined the Pauli resonance states.

    Comments:
    54 pages, 28 figures, typos are corrected and few paragraph are added with more detailed explanations, submitted to Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2310.16373 [pdf]
    PRC(2024)·0 citations
  4. 04

    [Submitted on 25 Oct 2023]

    Muonic hyperfine structure and the Bohr-Weisskopf effect

    J.R. Persson🇳🇴

    An update is given on the experimental values of the magnetic hyperfine structure and the Bohr-Weisskopf effect in muonic atoms. The need for more measurements and systematic calculations is discussed to allow the differentiation of different models of the Bohr-Weisskopf effect in nuclei.

    Comments:
    14 pages Updated due to an error in the magnetic moment of 193Ir (3/2) given in Table 2. The correct value is given now Update #2 due to error in magnetic moment of 200Hg, removal of BW data on 197Au as questions on the calculations have not been resolved
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex); Atomic Physics (physics.atom-ph)
    arXiv:
    2310.16398 [pdf]
    3 citations
  5. 05

    [Submitted on 25 Oct 2023]

    Quadrupole-octupole coupling and the onset of octupole collectivity

    K. Nomura

    Octupole deformation and collective excitations are studied within the interacting boson model. By using the results of the self-consistent mean-field calculations with a universal energy density functional, the Hamiltonian of the interacting , , and boson system is completely determined. A global systematic study confirms that significant octupole effects are present in actinide, lanthanide, and rare-earth nuclei corresponding to particular nucleon numbers for which octupole correlations are empirically suggested to be enhanced.

    Comments:
    5 pages, 7 figures; Proceedings of the 17th International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics (CGS17), Grenoble, 17-21 July 2023
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2310.16408 [pdf]
    EPJ Web Conf.(2025)·0 citations
  6. 06

    [Submitted on 25 Oct 2023]

    Zero-sound modes for the nuclear equation of state at supra-normal densities

    Jing Ye🇨🇳 · J. Margueron🇫🇷 · Niu Li🇨🇳 · W. Z. Jiang🇨🇳

    The meaningful correlations between the zero-sound modes and the stiffness of the nuclear equation of state (EOS) are uncovered in nuclear matter with the relativistic mean-field theory. It is demonstrated that the high-density zero-sound modes merely exist in models with the stiff EOS. While the stiff EOS can be softened by including {\omega}-meson self-interactions (the {\omega}4 term), the weakened coupling of the {\omega}-meson self-interactions reignites the zero sound at high density. These results suggest that the high-density zero-sound modes can be used to probe the stiffness of the EOS at supra-normal densities. The implications and effects of zero sounds are also discussed in heavy ion collisions and neutron stars.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2310.16759 [pdf]
    PRC(2023)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE