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Nuclear Theory·nucl-th

Monday·October 5, 2020

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 2 Oct 2020]

    Semi-classical approaches to heavy-ion reactions: fusion, rainbow, and glory

    L.F. Canto · K. Hagino · M. Ueda

    A semi-classical approximation has been a powerful tool in understanding the dynamics of low-energy heavy-ion reactions. Here we discuss two topics in this regard, for which Mahir Hussein was a world leading pioneer. The first topic is heavy-ion fusion reactions of neutron-rich nuclei, in which the breakup process of the projectile nucleus plays a crucial role. The second is rainbow and glory scattering, for which characteristic oscillatory patterns in differential cross sections can be well understood in terms of intereferences among several semi-classical trajectories.

    Comments:
    10 pages, 7 figures. A contribution to the topical issue "Cluster structure and dynamics of nuclei - A tribute to Mahir Hussein", to be published in Euro. Phys. J. A
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2010.00833 [pdf]
    EPJA(2021)·7 citations
  2. 02

    [Submitted on 2 Oct 2020]

    Spin-polarized -stable neutron star matter: the nuclear symmetry energy and GW170817 constraint

    Ngo Hai Tan · Dao T. Khoa · Doan Thi Loan

    Magnetic field of rotating pulsar might be so strong that the equation of state (EOS) of neutron star (NS) matter is significantly affected by the spin polarization of baryons. In the present work, the EOS of the spin-polarized nuclear matter is investigated in the nonrelativistic Hartree-Fock formalism, using a realistic density dependent nucleon-nucleon interaction with its spin and spin-isospin dependence accurately adjusted to the Brueckner-Hartree-Fock results for the spin-polarized nuclear matter. The nuclear symmetry energy and proton fraction are found to increase significantly with the increasing spin polarization of baryons, leading to a larger probability of the direct Urca process in the cooling of magnetar. The EOS of the -stable np matter obtained at different spin polarizations of baryons is used as the input for the Tolman-Oppenheimer-Volkov equations to determine the hydrostatic configuration of NS. Based on the GW170817 constraint on the radius of NS with , our mean-field results show that up to of baryons in the NS merger might be spin-polarized. This result supports the magnetar origin of the blue kilonova ejecta of GW170817 suggested by Metzger et al., and the spin polarization of baryons needs, therefore, to be properly treated in the many-body calculation of the EOS of NS matter before comparing the calculated NS mass and radius with those constrained by the multi-messenger GW170817 observation.

    Comments:
    Misprints corrected; published in Physical Review C 102, 045809 (2020)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Experiment (nucl-ex)
    arXiv:
    2010.00869 [pdf]
    PRC(2020)·6 citations
  3. 03

    [Submitted on 1 Oct 2020]

    3-Dimensional QCD Phase Diagrams for Strange Matter

    V. Dexheimer · K. Aryal · C. Constantinou · J. Peterson

    In this work, we examine in detail the difference between constraining the electric charge fraction and isospin fraction when calculating the deconfinement phase transition in the presence of net strangeness. We present relations among charge and isospin fractions and the corresponding chemical potentials and draw 3-dimensional QCD phase diagrams for matter out of weak equilibrium. Finally, we briefly discuss how our results can be applied to comparisons of matter created in heavy ion collisions and binary neutron star mergers.

    Comments:
    arXiv admin note: text overlap with arXiv:2004.03039
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2010.00996 [pdf]
    J.Phys.Conf.Ser.(2020)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE