PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·June 3, 2020

12 papers—5 primary·7 cross-listed

All12Primary5Cross-lists7
  1. 01

    [Submitted on 1 Jun 2020]

    Effects of the QCD phase transition on hadronic observables in relativistic hydrodynamic simulations of heavy-ion reactions in the FAIR/NICA energy regime

    Christian Spieles🇩🇪 · Marcus Bleicher🇩🇪

    We investigate hadronic particle spectra and flow characteristics of heavy-ion reactions in the FAIR/NICA energy range of within a relativistic ideal hydrodynamic one-fluid approach. The particlization is realized by sampling the Cooper-Frye distribution for a grand canonical hadron gas on a hypersurface of constant energy density. Results of the hydrodynamic calculations for different underlying equations of state are presented and compared with experimental data and microscopic transport simulations. The sensitivity of the approach to physical model inputs concerning the initial state and the particlization is studied.

    Comments:
    Submitted to EPJ ST
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2006.01220 [pdf]
    Eur.Phys.J.ST(2020)·16 citations
  2. 02

    [Submitted on 2 Jun 2020]

    Quantum Simulation of Nuclear Inelastic Scattering

    Weijie Du🇨🇳 · James P. Vary🇺🇸 · Xingbo Zhao🇨🇳 · Wei Zuo🇨🇳

    We present a time-dependent quantum algorithm for nuclear inelastic scattering in the time-dependent basis function on qubits approach. This algorithm aims to quantum simulate a subset of the nuclear inelastic scattering problems that are of physical interest, in which the internal degrees of freedom of the reaction system are excited by time-dependent external interactions. We expect that our algorithm will enable an exponential speedup in simulating the dynamics of the subset of the inelastic scattering problems, which would also be advantageous for the applications to more complicated scattering problems. For a demonstration problem, we solve for the Coulomb excitation of the deuteron, where the quantum simulations are performed with IBM Qiskit.

    Comments:
    4 figures, 1 table, 25 pages. Accepted by Phys. Rev. A. Comments are welcome!
    Subjects:
    Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    2006.01369 [pdf]
    PRA(2021)·47 citations
  3. 03

    [Submitted on 2 Jun 2020]

    Symmetry energy properties of neutron-rich nuclei from the coherent density fluctuation model applied to nuclear matter calculations with Bonn potentials

    I. C. Danchev · A. N. Antonov · D. N. Kadrev · M. K. Gaidarov · P. Sarriguren · E. Moya de Guerra

    We derive the values of nuclear symmetry energy, its components, as well as pressure in finite nuclei at saturation density from their corresponding values in nuclear matter obtained in non-relativistic Brueckner-Hartree-Fock calculations with the realistic Bonn B and Bonn CD potentials using the coherent density fluctuation model in the framework of a self-consistent Skyrme-Hartree-Fock plus BCS method. We focus on three isotopic chains of spherical nuclei (Ni, Sn, and Pb) and compare our results with those obtained with an effective Brueckner density-dependent potential. The role of the three-body forces on the considered quantities is also studied and discussed.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2006.01471 [pdf]
    PRC(2020)·11 citations
  4. 04

    [Submitted on 2 Jun 2020]

    Low-energy 11Li + p and 11Li + d scattering in a multicluster model

    Pierre Descouvemont

    The 11Li + p and 11Li + d reactions are investigated in the Continuum Discretized Coupled Channel (CDCC) method with a three-body description (9Li + n + n) of 11Li. I first discuss the properties of 11Li, and focus on E1 transition probabilities to the continuum. The existence of a 1- resonance at low excitation energies is confirmed, but the associated E1 transition from the ground state does not have an isoscalar character, as suggested in a recent experiment. In a second step, I study the 11Li + p elastic cross section at Elab = 66 MeV in the CDCC framework. I obtain a fair agreement with experiment, and show that breakup effects are maximal at large angles. The breakup cross section is shown to be dominated by the 1- dipole state in 11Li, but the role of this resonance is minor in elastic scattering. From CDCC equivalent 11Li + p and 11Li + n potentials, I explore the 11Li + d cross section within a standard three-body 11Li +(p + n) model. At small angles, the experimental cross section is close to the Rutherford scattering cross section, which is not supported by the CDCC. A five-body (9Li+n+n)+(p+n) is then performed. Including breakup states in 11Li and in the deuteron represents a numerical challenge for theory, owing to the large number of channels. Although a full convergence could not be reached, the CDCC model tends to overestimate the data at small angles. I suggest that measurements of the 9Li + p elastic scattering would be helpful to determine more accurate optical potentials. The current disagreement between experiment and theory on 11Li + d scattering also deserves new experiments at other energies.

    Comments:
    12 pages, 10 figures, accepted at Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2006.01548 [pdf]
    PRC(2020)·15 citations
  5. 05

    [Submitted on 31 May 2020]

    Minimal Theory of Isomerism -Q.Q and Other Interactions

    Praveen Srivastava · Larry Zamick

    We perform shell model calculations using a quadrupole-quadrupole interaction (Q.Q) in single a j shell space. We show that this one-parameter interaction is a good predictor of where nuclear isomerism occurs and where it does not occur. The limitations of this interaction are also discussed. We then include other interactions e.g. in the f_{7/2} shell those obtained from the (local) spectrum of a 2 particle system and then from a 2 hole system. In the g_{9/2}where there is insufficient empirical data from the 2 hole system and so various empirical interactions are used.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2006.01637 [pdf]
    Phys.Scripta(2021)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE