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Nuclear Theory·nucl-th

Monday·November 18, 2019

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    [Submitted on 14 Nov 2019]

    Primary fission fragment mass yields across the chart of nuclides

    M. R. Mumpower · P. Jaffke · M. Verriere · J. Randrup

    We have calculated a complete set of primary fission fragment mass yields, , for heavy nuclei across the chart of nuclides, including those of particular relevance to the rapid neutron capture process ( process) of nucleosynthesis. We assume that the nuclear shape dynamics are strongly damped which allows for a description of the fission process via Brownian shape motion across nuclear potential-energy surfaces. The macroscopic energy of the potential was obtained with the Finite-Range Liquid-Drop Model (FRLDM), while the microscopic terms were extracted from the single-particle level spectra in the fissioning system by the Strutinsky procedure for the shell energies and the BCS treatment for the pairing energies. For each nucleus considered, the fission fragment mass yield, , is obtained from 50,000 -- 500,000 random walks on the appropriate potential-energy surface. The full mass and charge yield, , is then calculated by invoking the Wahl systematics. With this method, we have calculated a comprehensive set of fission-fragment yields from over 3,800 nuclides bounded by and ; these yields are provided as an ASCII formatted database in the supplemental material. We compare our yields to known data and discuss general trends that emerge in low-energy fission yields across the chart of nuclides.

    Comments:
    22 pages, 15 figures
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    1911.06344 [pdf]
    PRC(2020)·71 citations
  2. 02

    [Submitted on 14 Nov 2019]

    Equation of state of QCD matter within the Hagedorn bag-like model

    Volodymyr Vovchenko🇩🇪 · Mark I. Gorenstein🇩🇪 · Carsten Greiner🇩🇪 · Horst Stoecker🇩🇪

    The QCD equation of state at finite temperature and densities of conserved charges is considered in the framework of a Hagedorn bag-like model, incorporating both the finite sizes of hadrons as well as their exponential mass spectrum. Augmented with non-zero masses of quarks and gluons in the bag spectrum, the model yields a fair quantitative description of lattice data on thermodynamic functions, the conserved charges susceptibilities, and Fourier coefficients of net-baryon density. Both at zero and finite baryon densities a broad crossover transition between hadronic and quark-gluon matter is observed. The model thus provides a thermodynamically consistent construction of a crossover equation of state for finite baryon number, electric charge and strangeness chemical potentials, which can be used in fluid dynamical simulations of heavy-ion collisions.

    Comments:
    5 pages, 1 figure. Contribution to the Strangeness in Quark Matter 2019 (SQM 2019) conference proceedings
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1911.06420 [pdf]
    Springer Proc.Phys.(2020)·2 citations
  3. 03

    [Submitted on 15 Nov 2019]

    Ab-initio no-core Gamow shell model calculations of multi-neutron systems

    Jian Guo Li · Nicolas Michel · Bai Shan Hu · Wei Zuo · Fu Rong Xu

    The existence of multi-neutron systems has always been a debatable question. Indeed, both inter-nucleon correlations and a large continuum coupling occur in these states. We then employ the ab-initio no-core Gamow shell model to calculate the resonant energies and widths of the trineutron and tetraneutron systems with realistic interactions. Our results indicate that trineutron and tetraneutron are both unbound and bear broad widths. The calculated energy and width of tetraneutron are also comparable with recent experimental data. Moreover, our calculations suggest that the energy of trineutron is lower than that of tetraneutron, while its resonance width is also narrower. This strongly suggests that trineutron is more likely to be experimentally observed than tetraneutron. We thus suggest experimentalists to search for trineutron at low energy.

    Comments:
    5 pages; 2 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1911.06485 [pdf]
    PRC(2019)·71 citations
  4. 04

    [Submitted on 15 Nov 2019]

    Longitudinal dependence of open heavy flavor in relativistic heavy-ion collisions

    Caio A. G. Prado🇨🇳 · Wen-Jing Xing🇨🇳 · Shanshan Cao🇺🇸 · Guang-You Qin🇨🇳 · Xin-Nian Wang🇨🇳

    Heavy flavor probes are sensitive to the properties of the quark gluon plasma (QGP) produced in relativistic heavy-ion collisions. A huge amount of effort has been devoted to studying different aspects of the heavy-ion collisions using heavy flavor particles. In this work, we study the dynamics of heavy quark transport in the QGP medium using the rapidity dependence of heavy flavor observables. We calculate the nuclear modification of and meson spectra as well as spectra of leptons from heavy flavor decays in the rapidity range . We use an implementation of the improved Langevin equation with gluon radiation on top of a (3+1)-dimensional relativistic viscous hydrodynamical background for several collision setups. We find that the rapidity dependence of the heavy quark modification is determined by the interplay between the smaller size of the medium, which affects the path length of the heavy quarks, and the softer heavy quark initial production spectrum. We compare our results with available experimental data and present predictions for open heavy flavor meson at finite rapidity.

    Comments:
    7 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1911.06527 [pdf]
    PRC(2020)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE