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Nuclear Theory·nucl-th

Wednesday·November 8, 2017

8 papers—6 primary·2 cross-listed

All8Primary6Cross-lists2
  1. 01

    [Submitted on 6 Nov 2017]

    Accuracy of fission dynamics within the time dependent superfluid local density approximation

    J. Grineviciute · P. Magierski · A. Bulgac · S. Jin · I. Stetcu

    We discuss properties of the method based on time dependent superfluid local density approximation (TDSLDA) within an application to induced fission of 240Pu and surrounding nuclei. Various issues related to accuracy of time evolution and the determination of the properties of fission fragments are discussed.

    Comments:
    Contribution to Proceedings of XXXV Mazurian Lakes Conference on Physics, Piaski, Poland, September 3-9, 2017
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1711.02169 [pdf]
    Acta Phys.Polon.B(2018)·6 citations
  2. 02

    [Submitted on 7 Nov 2017]

    Shape transition with temperature of the pear-shaped nuclei in covariant density functional theory

    Wei Zhang · Yi Fei Niu

    The shape evolutions of the pear-shaped nuclei Ra and even-even Ba with temperature are investigated by the finite-temperature relativistic mean field theory with the treatment of pairing correlations by the BCS approach. The free energy surfaces as well as the bulk properties including deformations, pairing gaps, excitation energy, and specific heat for the global minimum are studied. For Ra, three discontinuities found in the specific heat curve indicate the pairing transition at temperature 0.4 MeV, and two shape transitions at temperatures 0.9 and 1.0 MeV, namely one from quadrupole-octupole deformed to quadrupole deformed, and the other from quadrupole deformed to spherical. Furthermore, the gaps at 136 and 88 are responsible for stabilizing the octupole-deformed global minimum at low temperatures. Similar pairing transition at 0.5 MeV and shape transitions at =0.5-2.2 MeV are found for even-even Ba. The transition temperatures are roughly proportional to the corresponding deformations at the ground states.

    Comments:
    19 pages, 11 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1711.02234 [pdf]
    PRC(2017)·39 citations
  3. 03

    [Submitted on 7 Nov 2017]

    A description of the transverse momentum distributions of charged particles produced in heavy ion collisions at RHIC and LHC energies

    Jia-Qi Hui🇨🇳 · Zhi-Jin Jiang🇨🇳 · Dong-Fang Xu🇨🇳

    By assuming the existing of memory effects and long-range interactions in the hot and dense matter produced in high energy heavy ion collisions, the nonextensive statistics together with the relativistic hydrodynamics including phase transition is used to discuss the transverse momentum distributions of charged particles produced in heavy ion collisions. It is shown that the combined contributions from nonextensive statistics and hydrodynamics can give a good description to the experimental data in Au+Au collisions at sqrt(s_NN )= 200 GeV and in Pb+Pb collisions at sqrt(s_NN) )= 2.76 TeV for pi^(+ -) , K^(+ -) in the whole measured transverse momentum region, and for p(p-bar) in the region of p_T<= 2.0 GeV/c. This is different from our previous work, where, by using the conventional statistics plus hydrodynamics, the describable region is only limited in p_T<= 1.1 GeV/c.

    Comments:
    14 pages, 3 figures, 2 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1711.02241 [pdf]
    Adv.High Energy Phys.(2018)·3 citations
  4. 04

    [Submitted on 7 Nov 2017]

    Quantum self-organization and nuclear collectivities

    T. Otsuka · Y. Tsunoda · T. Togashi · N. Shimizu · T. Abe

    The quantum self-organization is introduced as one of the major underlying mechanisms of the quantum many-body systems, for instance, atomic nuclei. It is shown that atomic nuclei are not necessarily like simple rigid vases containing almost free nucleons, in contrast to the naive Fermi liquid picture. Nuclear forces are demonstrated to be rich enough to change single-particle energies for each eigenstate, so as to enhance the relevant collective mode. When the quantum self-organization occurs, single-particle energies can be self-organized (or self-optimized), being enhanced by (i) two quantum liquids, e.g., protons and neutrons, (ii) two major force components, e.g., quadrupole interaction (to drive collective mode) and monopole interaction (to control resistance). Type II shell evolution is considered to be a simple visible case involving excitations across a (sub)magic gap. Actual cases such as shape coexistence, quantum phase transition, octupole vibration/deformation, super deformation, etc. can be studied with this scope. The quantum self-organization becomes more important in heavier nuclei where the number of active orbits and the number of active nucleons are larger. With larger numbers of them, the effects of the organization can be more significant. The quantum self-organization is a general phenomenon, and is expected to be found in other quantum systems.

    Comments:
    To be published in Journal of Physics: Conference Series
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1711.02275 [pdf]
    J.Phys.Conf.Ser.(2018)·4 citations
  5. 05

    [Submitted on 7 Nov 2017]

    Anomalous Chiral Transport in Heavy Ion Collisions from Anomalous-Viscous Fluid Dynamics

    Shuzhe Shi🇺🇸 · Yin Jiang🇨🇳 · Elias Lilleskov🇺🇸 · Jinfeng Liao🇺🇸

    Chiral anomaly is a fundamental aspect of quantum theories with chiral fermions. How such microscopic anomaly manifests itself in a macroscopic many-body system with chiral fermions, is a highly nontrivial question that has recently attracted significant interest. As it turns out, unusual transport currents can be induced by chiral anomaly under suitable conditions in such systems, with the notable example of the Chiral Magnetic Effect (CME) where a vector current (e.g. electric current) is generated along an external magnetic field. A lot of efforts have been made to search for CME in heavy ion collisions, by measuring the charge separation effect induced by the CME transport. A crucial challenge in such effort, is the quantitative prediction for the CME signal. In this paper, we develop the Anomalous-Viscous Fluid Dynamics (AVFD) framework, which implements the anomalous fluid dynamics to describe the evolution of fermion currents in QGP, on top of the neutral bulk background described by the VISH2+1 hydrodynamic simulations for heavy ion collisions. With this new tool, we quantitatively and systematically investigate the dependence of the CME signal to a series of theoretical inputs and associated uncertainties. With realistic estimates of initial conditions and magnetic field lifetime, the predicted CME signal is quantitatively consistent with measured change separation data in 200GeV Au-Au collisions. Based on analysis of Au-Au collisions, we further make predictions for the CME observable to be measured in the planned isobaric (Ru-Ru v.s. Zr-Zr ) collision experiment, which could provide a most decisive test of the CME in heavy ion collisions.

    Comments:
    28 pages, 13 figures; published version
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1711.02496 [pdf]
    Annals Phys.(2018)·141 citations
  6. 06

    [Submitted on 7 Nov 2017]

    Azimuthal angle dependence of the charge imbalance from charge conservation effects

    Piotr Bozek

    The experimental search for the chiral magnetic effect in heavy-ion collisions is based on charge dependent correlations between emitted particles. Recently, a sensitive observable comparing event-by-event distributions of the charge splitting projected on the directions along and perpendicular to the direction of the elliptic flow has been proposed. The results of a 3+1-dimensional hydrodynamic model show that the preliminary experimental data of the STAR Collaboration can be explained as due to background effects, such as resonance decays and local charge conservation in the particle production. A related observable based on the third order harmonic flow is proposed to further investigate such background effects in charge dependent correlations.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1711.02563 [pdf]
    PRC(2018)·16 citations

Affiliations

first authorsco-authorsvia INSPIRE