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Nuclear Theory·nucl-th

Thursday·December 19, 2019

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    [Submitted on 17 Dec 2019]

    Particlization in fluid dynamical simulations of heavy-ion collisions: The iS3D module

    Mike McNelis🇺🇸 · Derek Everett🇺🇸 · Ulrich Heinz🇺🇸

    The iS3D particlization module simulates the emission of hadrons from heavy-ion collisions via Monte-Carlo sampling of the Cooper-Frye formula which converts fluid dynamical information into local phase-space distributions for hadrons. The code package includes multiple choices for the non-equilibrium correction to these distribution functions: the 14-moment approximation, first-order Chapman-Enskog expansion, and two types of modified equilibrium distributions. This makes it possible to explore to what extent heavy-ion experimental data are sensitive to different choices for , presently the main source of theoretical uncertainty in the particlization stage. We validate our particle sampler with a high degree of precision by generating several million hadron emission events from a longitudinally boost-invariant hypersurface and comparing the event-averaged particle spectra and space-time distributions to the Cooper-Frye formula.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1912.08271 [pdf]
    Comput.Phys.Commun.(2021)·70 citations
  2. 02

    [Submitted on 18 Dec 2019]

    Can the hyperfine mass splitting formula in heavy quarkonia be applied to the system?

    Lei Chang🇨🇳 · Muyang Chen🇨🇳 · Xue-qian Li🇨🇳 · Yu-xin Liu🇨🇳 · Khépani Raya🇨🇳

    The mass relation miraculously holds for the -wave charmonium and bottomonium systems with soaring precision. The origin of such relation can be addressed from Quark Models, and have been confirmed experimentally in a limited number of cases. In this connection, we propose as an extension to the -wave case. In order to test its applicability, we employ a variety of Quark Model predictions for the mass spectrum. Our numerical analysis confirms such formula is accurate up to very small deviations.

    Comments:
    3 pages, no figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1912.08339 [pdf]
    Few Body Syst.(2021)·10 citations
  3. 03

    [Submitted on 18 Dec 2019]

    Bohr Hamiltonian with Pöschl Teller potential in {\gamma} unstable and {\gamma} stable pictures

    A. Ait Ben Hammou · M. Chabab · A. El Batoul · A. Lahbas · M. Hamzavi · I. Moumene · M. Oulne

    In this paper, we present an analytical solution for the Bohr Hamiltonian with the trigonometric Pöschl Teller (P.T) potential in the cases of {\gamma} unstable nuclei and {\gamma} stable axially symmetric prolate deformed ones with {\gamma} = 0. The energy spectra and corresponding wave functions are derived by means of the asymptotic iteration method. In addition, B(E2) transition rates are calculated and compared with experimental data. Overall good agreement is obtained for inter and intra band transitions within ground state and \b{eta} bands. Our numerical results, particularly for transition rates are much closer to experimental ones in comparison with those obtained by Davidson and Kratzer potentials which are widely used in the literature.

    Comments:
    14 pages, 6 figures, 6 tables
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1912.08525 [pdf]
    Eur.Phys.J.Plus(2019)·4 citations
  4. 04

    [Submitted on 15 Dec 2019]

    Multiple quantum phase transitions in the Zr isotopes

    N. Gavrielov · A. Leviatan · F. Iachello

    We present a detailed analysis of spectra and other observables for the entire chain of Zr isotopes, from neutron number 52 to 70, in the framework of the interacting boson model with configuration mixing. The results suggest a remarkable interplay of multiple quantum phase transitions (QPTs). One type of QPT involves an abrupt crossing of normal and intruder configurations, superimposed on a second type of QPT involving gradual shape-changes within each configuration.

    Comments:
    13 pages, 8 figures, Proceedings International Workshop "Shapes and Dynamics of Atomic Nuclei: Contemporary Aspects" (SDANCA-19), October 3-5, 2019, Sofia, Bulgaria. arXiv admin note: substantial text overlap with arXiv:1909.08305, arXiv:1908.06677, arXiv:1904.09919
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1912.08708 [pdf]
    Bulg.J.Phys.(2019)·0 citations

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