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Nuclear Theory·nucl-th

Friday·May 3, 2024

3 papers—1 primary·2 cross-listed

All3Primary1Cross-lists2
  1. 01

    [Submitted on 2 May 2024]

    The odd-even differences in stability peninsula for region with the deformed relativistic Hartree-Bogoliubov theory in continuum

    Xiao-Tao He · Jia-Wei Wu · Kai-Yuan Zhang · Cai-Wan Shen

    The predictive power of the deformed relativistic Hartree-Bogoliubov theory in continuum (DRHBc) with density functional PC-PK1 is demonstrated for superheavy region () by comparing with available experimental and evaluated data in the AME2020. The DRHBc theory predicts 93 bound nuclei beyond the drip line in the region of , which form a stability peninsula. The odd-even differences between odd- and even- nuclei are remarkable in the stability peninsula; the number of bound odd- nuclei is less than that of bound even- nuclei, and the one-neutron separation energy of an odd- nucleus is smaller than those of its neighboring even- nuclei due to the blocking effect. The deformation effect is indispensable for the reentrant stability beyond the drip line by significantly affecting the structure of single-particle levels around the Fermi energy. The interplay between deformation and pairing effects affects the position where the odd- nucleus becomes bound in the stability peninsula. By examining the deformation effect at different orders, it is found that quadrupole deformation makes leading contribution to the appearance of stability peninsula and the effects of hexadecapole and hexacontatetrapole deformations are nonnegligible.

    Comments:
    6 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2405.01317 [pdf]
    PRC(2024)·20 citations
  2. 02

    [Submitted on 1 May 2024] (cross-list from hep-ph)

    symmetry breaking quark interactions from vacuum polarization

    Fabio L. Braghin🇧🇷

    By considering the one loop background field method for a quark-antiquark interaction, mediated by one (non perturbative) gluon exchange, sixth order quark effective interactions are derived and investigated in the limit of zero momentum transfer for large quark and/or gluon effective masses. They extend fourth order quark interactions worked out in previous works of the author. These interactions break symmetry and may be either momentum independent or dependent. Part of these interactions vanish in the limit of massless quarks, and several other -- involving vector and/or axial quark currents -- survive. In the local limit of the resulting interactions, some phenomenological implications are presented, which correspond to corrections to the Nambu-Jona-Lasinio model. By means of the auxiliary field method, the local interactions give rise to three meson interactions whose values are compared to phenomenological values found in the literature. Contributions for meson-mixing parameters are calculated and compared to available results.

    Comments:
    14 pages, one figure, revised manuscript. The original version v1 was split into two manuscripts, this is the first one. Accepted for publication
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2405.00880 [pdf]
    EPJA(2024)·7 citations
  3. 03

    [Submitted on 2 May 2024] (cross-list from hep-ph)

    Particle-theory input for neutron-star physics

    Aleksi Vuorinen🇫🇮

    Understanding the properties and physical phase of the dense strongly interacting matter present in the cores of neutron stars or created in their binary mergers remains one of the most prominent open problems in nuclear astrophysics. While most microscopic analyses have historically relied on solvable phenomenological models of nuclear and quark matter, in recent years a model-independent approach utilizing only controlled ab-initio calculations and astrophysical observations has emerged as a viable alternative. In these lecture notes, I review recent progress in first-principles weak-coupling calculations within high-density quark matter, shedding light on its thermodynamic and transport properties. I cover the most important technical tools used in such calculations, introduce selected highlight results, and explain how this information can be used in phenomenological studies of neutron-star physics. The notes do not offer a self-consistent treatment of the topics covered, but rather aim at filling gaps in existing textbooks on thermal field theory and at connecting the dots in a story developed in several recent research articles, to which the interested reader is directed for further technical details.

    Comments:
    55 pages, 12 figures. Lecture notes for lectures presented at the 63rd Cracow School of Theoretical Physics, held in Zakopane, Poland on 17-23 September 2023. v2: Version accepted for publication in Acta Phys. Pol. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2405.01141 [pdf]
    Acta Phys.Polon.B(2024)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE