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Nuclear Theory·nucl-th

Monday·February 12, 2018

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 9 Feb 2018]

    Nuclear reaction path and requantization of TDDFT

    Kai Wen · Takashi Nakatsukasa

    Using a theory of large amplitude collective motion, the adiabatic self-consistent collective coordinate method, we derive reaction path for the fusion process at sub-barrier energies. The collective Hamiltonian to describe the fusion process is constructed, based on the obtained reaction path and canonical variables. We study the reaction of N=Z stable nuclei, alpha+16O, 16O+16O, and alpha+12C. The results suggest that, after two nuclei touch, the reaction path is significantly deviated from the simple relative motion, which may affect the deep sub-barrier fusion cross section.

    Comments:
    8 pages, 2 figures, Proceedings of IIRC symposium "Perspectives of the Physics of Nuclear Structure"
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1802.03124 [pdf]
    JPS Conf.Proc.(2018)·1 citation
  2. 02

    [Submitted on 9 Feb 2018]

    Vector-Interaction-Enhanced Bag Model

    Mateusz Cierniak🇵🇱 · Thomas Klähn🇺🇸 · Tobias Fischer🇵🇱 · Niels-Uwe Bastian🇵🇱

    A commonly applied quark matter model in astrophysics is the thermodynamic bag model (tdBAG). The original MIT bag model approximates the effect of quark confinement, but does not explicitly account for the breaking of chiral symmetry, an important property of Quantum Chromodynamics (QCD). It further ignores vector repulsion. The vector-interaction-enhanced bag model (vBag) improves the tdBAG approach by accounting for both dynamical chiral symmetry breaking and repulsive vector interactions. The latter is of particular importance to studies of dense matter in beta-equilibriumto explain the two solar mass maximum mass constraint for neutron stars. The model is motivated by analyses of QCD based Dyson-Schwinger equations (DSE), assuming a simple quark-quark contact interaction. Here, we focus on the study of hybrid neutron star properties resulting from the application of vBag and will discuss possible extensions.

    Comments:
    9 pages, 4 figures, conference proceedings of CSQCD 6
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1802.03214 [pdf]
    Universe(2018)·24 citations
  3. 03

    [Submitted on 9 Feb 2018]

    Moments of inertia of neutron stars in relativistic mean field theory: the role of the isovector scalar channel

    Zhuang Qian🇨🇳 · Ruo Yu Xing🇨🇳 · Bao Yuan Sun🇨🇳

    With the inclusion of the isovector scalar channel in the meson-nucleon couplings, taking DD-ME as an effective interaction, the moments of inertia of neutron stars possessing various stellar masses are studied within the density dependent relativistic mean field (RMF) theory. The isovector scalar channel contributes to the softening of the neutron-star matter equation of state (EOS) and therefore the reduction of the maximum mass and radius of neutron stars. Smaller values of the total moment of inertia and the crustal moment of inertia are then obtained in DD-ME via numerical procedure in comparison with those in other selected RMF functionals. In addition, the involvement of the isovector scalar channel lowers the thickness of the neutron star crust and its mass fraction as well. The sensitivity to both the crustal mass and stellar radius causes the crustal moment of inertia to be more obviously reduced than the total one, eventually leading to a suppression on the fraction of crustal moment of inertia in DD-ME. The results indicate the crustal moment of inertia as a more sensitive probe of the neutron-star matter EOS than the total one, and demonstrate that the isovector scalar meson-nucleon couplings in the RMF theory could exert influence over the physics of pulsar glitches.

    Comments:
    7 pages, 5 figures, 1 table, to be published in SCIENCE CHINA Physics, Mechanics & Astronomy
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    1802.03368 [pdf]
    7 citations
  4. 04

    [Submitted on 7 Feb 2018] (cross-list from nucl-ex)

    Chiral magnetic effect search in p(d)+Au, Au+Au collisions at RHIC

    Jie Zhao (for the STAR collaboration)🇺🇸

    The chiral magnetic effect (CME) refers to charge separation along a strong magnetic field of single-handed quarks, caused by interactions with topological gluon fields from QCD vacuum fluctuations. A major background of CME measurements in heavy-ion collisions comes from resonance decays coupled with elliptical flow anisotropy. These proceedings present two new studies from STAR to shed further light on the background issue: (1) small system p+Au and d+Au collisions where the CME signal is not expected, and (2) pair invariant mass dependence where resonance peaks can be identified.

    Comments:
    Particles and Nuclei International Conference 2017 (PANIC2017) proceeding contribution. arXiv admin note: text overlap with arXiv:1712.00394
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1802.03283 [pdf]
    Int.J.Mod.Phys.Conf.Ser.(2018)·7 citations
  5. 05

    [Submitted on 9 Feb 2018] (cross-list from hep-lat)

    Three-body spectrum in a finite volume: the role of cubic symmetry

    M. Döring🇺🇸 · H.-W. Hammer🇩🇪 · M. Mai🇺🇸 · J.-Y. Pang🇩🇪 · A. Rusetsky🇩🇪 · J. Wu🇩🇪

    The three-particle quantization condition is partially diagonalized in the center-of-mass frame by using cubic symmetry on the lattice. To this end, instead of spherical harmonics, the kernel of the Bethe-Salpeter equation for particle-dimer scattering is expanded in the basis functions of different irreducible representations of the octahedral group. Such a projection is of particular importance for the three-body problem in the finite volume due to the occurrence of three-body singularities above breakup. Additionally, we study the numerical solution and properties of such a projected quantization condition in a simple model. It is shown that, for large volumes, these solutions allow for an instructive interpretation of the energy eigenvalues in terms of bound and scattering states.

    Comments:
    16 pages, 7 figures, supplemental material; version accepted by journal
    Subjects:
    High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1802.03362 [pdf]
    PRD(2018)·149 citations

Affiliations

first authorsco-authorsvia INSPIRE