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Nuclear Theory·nucl-th

Tuesday·March 1, 2016

14 papers—7 primary·7 cross-listed

All14Primary7Cross-lists7
  1. 01

    [Submitted on 29 Feb 2016]

    Rapidity bin multiplicity correlations from a multi-phase transport model

    Mei-Juan Wang🇨🇳 · Gang Chen🇨🇳 · Yuan-Fang Wu🇨🇳 · Guo-Liang Ma🇨🇳

    The central-arbitrary bin and forward-backward bin multiplicity correlation patterns for Au+Au collisions at = GeV are investigated within a multi-phase transport (AMPT) model. An interesting observation is that for GeV Au+Au collisions, these two correlation patterns both have an increase with the pseudorapidity gap, while for GeV Au+Au collisions, they decrease. We mainly discuss the influence of different evolution stages of collision system on the central-arbitrary bin correlations, such as the initial conditions, partonic scatterings, hadronization scheme and hadronic scatterings. Our results show that the central-arbitrary bin multiplicity correlations have different responses to partonic phase and hadronic phase, which can be suggested as a good probe to explore the dynamical evolution mechanism of the hot dense matter in high-energy heavy-ion collisions.

    Comments:
    7pages, 6 figures, accepted for publication in EPJA
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1602.08842 [pdf]
    EPJA(2016)·1 citation
  2. 02

    [Submitted on 29 Feb 2016]

    Modes of decay in neutron-rich nuclei

    B. Kumar · S. K. Biswal · S. K. Singh · C. Lahiri · S. K. Patra

    We calculate the ground, first intrinsic excited states and density distribution for neutron-rich thorium and uranium isotopes, within the framework of relativistic mean field(RMF) approach using axially deformed basis. The total nucleon densities are calculated, from which the cluster-structures inside the parent nuclei are determined. The possible modes of decay, like {\alpha}-decay and \b{eta} -decay are analyzed. We find the neutron-rich isotopes are stable against {\alpha}-decay, however they are very much unstable against \b{eta} -decay. The life time of these nuclei predicted to be tens of second against \b{eta} -decay.

    Comments:
    16 pages,10 figures. arXiv admin note: substantial text overlap with arXiv:1508.00391
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1602.08871 [pdf]
    IJMPE(2016)·4 citations
  3. 03

    [Submitted on 29 Feb 2016]

    Effects of isovector scalar meson on hyperon star

    S. K. Biswal🇮🇳 · Bharat Kumar🇮🇳 · S. K. Patra🇮🇳

    We study the effects of isovector-scalar ()-meson on neutron star. Influence of -meson on both static and rotating neutron star is discussed. Inclusion of -meson in a neutron star system consisting of proton, neutron and electron, make the equation of state stiffer in higher density and consequently increases the maximum mass of the star. But induction of -meson in the hyperon star decreases the maximum mass of the hyperon star. This is due to the early evolution of hyperons in presence of meson.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1602.08888 [pdf]
    IJMPE(2016)·8 citations
  4. 04

    [Submitted on 29 Feb 2016]

    Multi-Strangeness Production in Hadron Induced Reactions

    T. Gaitanos🇬🇷 · Ch. C. Moustakidis🇬🇷 · G.A. Lalazissis🇬🇷 · H. Lenske🇩🇪

    We discuss in detail the formation and propagation of multi-strangeness particles in reactions induced by hadron beams relevant for the forthcoming experiments at FAIR. We focus the discussion on the production of the decuplet-particle and study for the first time the production and propagation mechanism of this heavy hyperon inside hadronic environments. The transport calculations show the possibility of -production in the forthcoming \panda-experiment, which can be achieved with measurable probabilities using high-energy secondary -beams. We predict cross sections for -production. The theoretical results are important in understanding the hyperon-nucleon and, in particular, the hyperon-hyperon interactions also in the high-strangeness sector. We emphasize the importance of our studies for the research plans at FAIR.

    Comments:
    18 pages, 7 figures. Revised version (updated literature list, more text added, typos corrected) accepted for publication in Nuclear Physics A
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1602.08905 [pdf]
    NPA(2016)·10 citations
  5. 05

    [Submitted on 29 Feb 2016]

    SU(3) Approach to Hypernuclear Interactions and Spectroscopy

    H. Lenske🇩🇪 · M. Dhar🇩🇪 · T. Gaitanos🇩🇪

    The meson exchange approach to interactions within the baryon octet and nuclear density functional theory are used to derive an \emph{ab initio} description of hypernuclear interactions. The density dependence of interactions is recast into a DFT with density dependent interaction vertices. The field-theoretical structure is retained by expressing the vertices as functionals of the matter field operators. Applications to infinite hypermatter and neutron star matter are discussed. A new approach is presented allowing to determine in-medium coupling constants out of the -vertex functionals, obtained e.g. by DBHF theory, for the full baryon octet by exploiting relations.

    Comments:
    34 pages, 8 tables, 13 figures. Submitted for publication
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1602.08917 [pdf]
    3 citations
  6. 06

    [Submitted on 29 Feb 2016]

    Dipole oscillation modes in light -clustering nuclei

    W. B. He · Y. G. Ma · X. G. Cao · X. Z. Cai · G. Q. Zhang

    The cluster states are discussed in a model frame of extended quantum molecular dynamics. Different alpha cluster structures are studied in details, such as Be two- cluster structure, C triangle structure, C chain structure, O chain structure, O kite structure, and O square structure. The properties studied, include as the width of wave packets for different clusters, momentum distribution, and the binding energy among clusters. It is also discussed how the cluster degree of freedom affects nuclear collective vibrations. The cluster configurations in C and O are found to have corresponding characteristic spectra of giant dipole resonance (GDR), and the coherences of different clusters's dipole oscillation are described in details. The geometrical and dynamical symmetries of -clustering configurations are responsible for the number and centroid energies of peaks of GDR spectra. Therefore, the GDR can be regarded as an effective probe to diagnose different cluster configurations in light nuclei.

    Comments:
    18 pages, 15 figures. Accepted by Physical Review C
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1602.08955 [pdf]
    PRC(2016)·47 citations
  7. 07

    [Submitted on 29 Feb 2016]

    Pressure Anisotropy in Heavy Ion Collisions from Color Glass Condensate

    Ming Li🇺🇸 · Joseph I. Kapusta🇺🇸

    We generalize calculations of the energy-momentum tensor for classical gluon fields in the McLerran-Venugopalan model using the small- power series expansion method. Results to all orders for the energy density and pressures are given in the leading approximation and with the inclusion of running coupling effects. The energy density and transverse pressure decrease monotonically with time while the longitudinal pressure starts from a negative value and increases towards zero.

    Comments:
    10 pages, 4 figures. An error in a Mathematica program in an earlier version is corrected
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1602.09060 [pdf]
    PRC(2016)·16 citations

Affiliations

first authorsco-authorsvia INSPIRE