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Nuclear Theory·nucl-th

Tuesday·July 23, 2019

12 papers—7 primary·5 cross-listed

All12Primary7Cross-lists5
  1. 01

    [Submitted on 20 Jul 2019]

    Are nuclear matter properties correlated to neutron star observables ?

    Jin-Biao Wei (1)🇮🇹 · Jia-Jing Lu (2)🇨🇳 · G. F. Burgio (1)🇮🇹 · Z. H. Li (2)🇨🇳 · H.-J. Schulze (1) ((1) INFN Sezione di Catania, (2) Fudan University, Shanghai)🇮🇹

    We investigate properties of nuclear matter and examine possible correlations with neutron star observables for a set of microscopic nuclear equations of state derived within the Brueckner-Hartree-Fock formalism employing compatible three-body forces. We find good candidates for a realistic nuclear EOS up to high density and confirm strong correlations between neutron star radius, tidal deformability, and the pressure of betastable matter. No correlations are found with the saturation properties of nuclear matter.

    Comments:
    9 pages, 5 figures, accepted in European Physical Journal A (EPJA), Topical issue "First joint gravitational wave and electromagnetic observations: Implications for nuclear and particle physics"
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.08761 [pdf]
    EPJA(2020)·51 citations
  2. 02

    [Submitted on 21 Jul 2019]

    Harmonic potential theorem: \\extension to spin-, velocity- and density-dependent interactions

    S. Zanoli · X. Roca-Maza · G. Colò · S. Shen (Dipartimento di Fisica "Aldo Pontremoli'', Università degli Studi di Milano, and INFN, Sezione di Milano, Italy)

    One of the few exact results for the description of the time-evolution of an inhomogeneous, interacting many-particle system is given by the Harmonic Potential Theorem (HPT). The relevance of this theorem is that it sets a tight constraint on time-dependent many-body approximations. In this contribution, we show that the original formulation of the HPT is valid also for the case of spin-, velocity- and density-dependent interactions. This result is completely general and relevant, among the rest, for nuclear structure theory both in the case of ab initio and of more phenomenological approaches. As an example, we report on a numerical implementation by testing the small-amplitude limit of the time-dependent Hartree-Fock -- also known as Random Phase Approximation (RPA) -- for the translational frequencies of a neutron system trapped in a harmonic potential.

    Comments:
    5 pages, 1 figure. Submitted to Phys. Rev. Lett
    Subjects:
    Nuclear Theory (nucl-th); cond-mat.other (cond-mat.other); physics.atm-clus (physics.atm-clus)
    arXiv:
    1907.08976 [pdf]
    PRL(2019)·0 citations
  3. 03

    [Submitted on 21 Jul 2019]

    Influence of in-medium mass width on Hanbury Brown-Twiss correlation strength

    Peng-Zhi Xu🇨🇳 · Wei-Ning Zhang🇨🇳

    The interactions of particles with medium may lead to a nonzero in-medium mass width of the particles and cause them to have different masses in the medium. In this letter, we investigate the influence of the in-medium mass width on the strength of Hanbury Brown-Twiss (HBT) correlation in high-energy heavy-ion collisions. It is found that the strength decreases with in-medium mass width of identical bosons. This influence are more significant for the boson with heavier mass and decreases with increasing particle momentum.

    Comments:
    3 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.08998 [pdf]
    1 citation
  4. 04

    [Submitted on 21 Jul 2019]

    Algebraic cluster models calculations for shape phase transitions of boson-fermion systems

    M.Ghapanvari · N.Amiri · M.A.Jafarizadeh

    The Algebraic Cluster Model(ACM) is an interacting boson model that gives the relative motion of the cluster configurations in which all vibrational and rotational degrees of freedom are present from the outset. We schemed a solvable extended transitional Hamiltonian based on affine Lie algebra within the framework for two-, three- and four- body algebraic cluster models that explains both regions , and , respectively . We offer that this method can be used to study of nucleon structures with k = 2, 3,4 and x = 1, 2, . . . , in specific x = 1,2 such as structures ,, ; , , ; , . Numerical extraction to the energy levels, the expectation value of boson number operator and behavior of the overlap of the ground-state wave function within the control parameters of this evaluated Hamiltonian are presented. The effect of the coupling of the odd particle to an even-even boson core is discussed along the shape transition and, in particular, at the critical point.

    Comments:
    arXiv admin note: text overlap with arXiv:1608.07487, arXiv:1412.5552, arXiv:1309.4881 by other authors
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.08999 [pdf]
    Mod.Phys.Lett.A(2024)·0 citations
  5. 05

    [Submitted on 22 Jul 2019]

    The n-th order Moment of the Nuclear Charge Density and Contribution from the Neutrons

    Haruki Kurasawa · Toshio Suzuki

    The relativistic expression for the -th order moment of the nuclear charge density is presented. For the mean square radius(msr) of the nuclear charge density, the non-relativistic expression, which is equivalent to the relativistic one, is also derived consistently up to with use of the Foldy-Wouthuysen transformation. The difference between the relativistic and non-relativistic expressions for the msr of the point proton density is also discussed. The -th order moment of the nuclear charge density depends on the point neutron density. The 4-th order moment yields a useful information on the msr of the point neutron density, and is expected to play an important role in electron scattering off neutron-rich nuclei.

    Comments:
    16 pages, 2 figures; v2: typos corrected
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.09071 [pdf]
    PTEP(2019)·35 citations
  6. 06

    [Submitted on 22 Jul 2019]

    Prompt, pre-equilibrium, and thermal photons in relativistic nuclear collisions

    Akihiko Monnai🇯🇵

    The direct photon emission model in relativistic nuclear colliders has been improved in recent years for reducing the discrepancy between theoretical estimations and experimental data and for understanding the properties of the QCD matter. In this study, the contribution of pre-equilibrium photons are investigated in addition to those of prompt and thermal photons in the framework of a relativistic hydrodynamic model. The numerical simulations at an LHC energy suggest that the pre-equilibrium photons may be relevant at intermediate transverse momentum near the saturation momentum scale, increasing particle spectra and reducing elliptic flow of direct photons.

    Comments:
    16 pages, 6 figures; revised version to appear in Journal of Physics G: Nuclear and Particle Physics
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1907.09266 [pdf]
    J.Phys.G(2020)·29 citations
  7. 07

    [Submitted on 22 Jul 2019]

    Role of charge equilibration in multinucleon transfer in damped collisions of heavy ions

    Vyacheslav Saiko · Alexander Karpov

    In this work, the charge equilibration process has been analyzed within the Langevin-type dynamical approach. Its duration and energy dependence are discussed. We have analyzed the isotopic distributions of final products obtained in the isospin-asymmetric 58Ni,40Ca + 208Pb reactions. Comparison of 58Ni,64Ni + 208Pb systems have been done in order to analyze the final yields of neutron-rich heavy nuclides.

    Comments:
    4 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1907.09352 [pdf]
    EPJ Web Conf.(2019)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE