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Nuclear Theory·nucl-th

Tuesday·October 17, 2017

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 01

    [Submitted on 14 Oct 2017]

    Light nuclei production in Pb+Pb collisions at TeV

    Lilin Zhu🇨🇳 · Hua Zheng🇮🇹 · Che Ming Ko🇺🇸 · Yifeng Sun🇺🇸

    Using the coalescence model based on the phase-space distribution of nucleons from an extended blast-wave model that includes the space-momentum correlation of high momentum nucleons, we study the transverse momentum spectra and elliptic flows of deuteron and helium-3 in Pb+Pb collisions at the energy TeV. We find that the measured elliptic flows of deuteron can be satisfactorily described if nucleons of large transverse momenta are more spread in space when their momenta are more aligned along the reaction plane.

    Comments:
    5 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1710.05139 [pdf]
    EPJA(2018)·22 citations
  2. 02

    [Submitted on 16 Oct 2017]

    Kinetics of the chiral phase transition in a linear model

    C. Wesp🇩🇪 · H. van Hees🇩🇪 · A. Meistrenko🇩🇪 · C. Greiner🇩🇪

    We study the dynamics of the chiral phase transition in a linear quark-meson model using a novel approach based on semiclassical wave-particle duality. The quarks are treated as test particles in a Monte-Carlo simulation of elastic collisions and the coupling to the meson, which is treated as a classical field. The exchange of energy and momentum between particles and fields is described in terms of appropriate Gaussian wave packets. It has been demonstrated that energy-momentum conservation and the principle of detailed balance are fulfilled, and that the dynamics leads to the correct equilibrium limit. First schematic studies of the dynamics of matter produced in heavy-ion collisions are presented.

    Comments:
    15 pages, 12 figures, accepted by EPJA, dedicated to memory of Walter Greiner; v2: corrected typos, added references and an acknowledgment
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1710.05547 [pdf]
    EPJA(2018)·6 citations
  3. 03

    [Submitted on 16 Oct 2017]

    Examinations of the consistency of the quasiparticle random-phase approximation approach to double- decay of Ca

    J. Terasaki🇨🇿

    The nuclear matrix elements (NMEs) of the neutrinoless and two-neutrino double- decays of Ca are calculated by the quasiparticle random-phase approximation (QRPA) with emphasis on the consistency examinations of this calculation method. The main new examination points are the consistency of two ways to treat the intermediate-state energies in the two-neutrino double- NME and comparison with the experimental charge-exchange strength functions obtained from Ca and Ti reactions. No decisive problem preventing the QRPA approach is found. The obtained neutrinoless double- NME adjusted by the ratio of the effective and bare axial-vector current couplings is lowest in those calculated by several groups and close to one of the QRPA values obtained by another group.

    Comments:
    13 pages, 13 figures. Discussions added to the previous version. Addition and removal of figures and tables
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1710.05572 [pdf]
    PRC(2018)·16 citations
  4. 04

    [Submitted on 16 Oct 2017]

    Nuclear density-functional theory and fission of super-heavy elements

    P.-G. Reinhard

    We review the prediction of fission properties of super-heavy elements (SHE) by self-consistent mean-field models thereby concentrating on the widely used Skyrme-Hartree-Fock (SHF) approach. We explain briefly the theoretical tools: the SHF model, the calibration of model parameters together with statistical analysis of uncertainties and correlations, and the involved computation of fission lifetimes. We present an overview of fission stability in comparison to other decay channels over the whole landscape of SHE reaching deep into the -process domain. The main emphasis lies on a detailed discussion of the various ingredients determining eventually the fission properties. The main result is that fission is an involved process which explores many different influences with almost equal share, basic bulk properties (also known as liquid-drop model parameters), pairing strengths, and shell effects. %

    Comments:
    9 figures, 1 table
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1710.05667 [pdf]
    EPJA(2018)·9 citations
  5. 05

    [Submitted on 16 Oct 2017]

    Non-trivial effect for the large radius at the dripline of Oxygen isotopes

    N. Itagaki · A. Tohsaki

    The anomalous large radii are exotic phenomena observed around the neutron dripline. Around the neutron dripline, the weak binding of the last bound neutron(s) causes the drastic increase of the radius, which is called neutron halo structure. Although the nucleus O is located at the dripline of Oxygen isotopes, the separation energies of one and two neutron(s) are 4.19 MeV and 6.92 MeV, respectively. In spite of this enough binding, the enhancement of the matter radius is observed. In this study, we microscopically describe the structure change of O core in O and explain the observed large radius based on the cluster model. Two degrees of freedom for the large radius; the relative distances among four clusters and size of each cluster are examined, where Tohsaki interaction, which has finite range three-body terms is employed. The nucleus O has the almost the same amount of the clusterization compared with O, but the expansion of each cluster plays an important role. When two neutrons are added to O at the center, the expansion of each clusters is energetically more favored than enhancing the clustering for reducing the kinetic energy of the neutrons. The calculated rms matter radius of O and O are 2.75 fm and 2.92 fm, respectively. Although these are slightly smaller than the experimental values, the jump at O from O is reproduced.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1710.05757 [pdf]
    PRC(2018)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE