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Nuclear Theory·nucl-th

Thursday·February 5, 2015

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    [Submitted on 4 Feb 2015]

    Emergence of rotational bands in ab initio no-core configuration interaction calculations

    M. A. Caprio · P. Maris · J. P. Vary · R. Smith

    Rotational bands have been observed to emerge in ab initio no-core configuration interaction (NCCI) calculations for p-shell nuclei, as evidenced by rotational patterns for excitation energies, electromagnetic moments, and electromagnetic transitions. We investigate the ab initio emergence of nuclear rotation in the Be isotopes, focusing on 9Be for illustration, and make use of basis extrapolation methods to obtain ab initio predictions of rotational band parameters for comparison with experiment. We find robust signatures for rotational motion, which reproduce both qualitative and quantitative features of the experimentally observed bands.

    Comments:
    10 pages, 5 figures; presented at Advanced Many-Body and Statistical Methods in Mesoscopic Systems II, Brasov, Romania, September 1-5, 2014; submitted to Rom. J. Phys
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1502.01083 [pdf]
    Rom.J.Phys.(2015)·4 citations
  2. 02

    [Submitted on 4 Feb 2015]

    Nucleus-nucleus potential with shell-correction contribution

    V. Yu. Denisov

    The full relaxed-density potential between spherical nuclei is considered as a sum of the macroscopic and shell-correction contributions. The macroscopic part of the potential is related to a nucleus-nucleus potential obtained in the framework of the extended Thomas-Fermi approach with the Skyrme and Coulomb forces and the relaxed-density ansatz for evaluation of proton and neutron densities of interacting nuclei. A simple prescription for the shell-correction part of the total potential is discussed. The parameters of the shell-correction and macroscopic parts of the relaxed-density potential are found by fitting the empirical barrier heights of the 89 nucleus-nucleus systems as well as macroscopic potentials evaluated for 1485 nucleus-nucleus systems at 12 distances around touching points.

    Comments:
    11 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1502.01164 [pdf]
    PRC(2015)·33 citations
  3. 03

    [Submitted on 4 Feb 2015]

    Reconstructing the final state of Pb+Pb collisions at TeV

    Ivan Melo🇸🇰 · Boris Tomasik🇸🇰

    We fit the single-hadron transverse-momentum spectra measured in Pb+Pb collisions at TeV with the blast-wave model that includes production via resonance decays. Common fit to pions, kaons, (anti)protons, and lambdas yields centrality dependence of the freeze-out temperature and transverse expansion velocity. In the most central collisions we see MeV and . The resonance fits into this picture but the meson might freeze-out a little earlier. Multistrange baryons seem to decouple at higher temperature and weaker transverse flow. Within our model we observe hints of chemical potential for the charged pions.

    Comments:
    accepted version (some explanations added with respect to v1), 21 pages, 12 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1502.01247 [pdf]
    J.Phys.G(2016)·31 citations
  4. 04

    [Submitted on 4 Feb 2015]

    Comparative study of three-nucleon force models in nuclear matter

    Domenico Logoteta · Isaac Vidaña · Ignazio Bombaci · Alejandro Kievsky

    We calculate the energy per particle of symmetric nuclear matter and pure neutron matter using the microscopic many-body Brueckner-Hartree-Fock (BHF) approach and employing the Argonne V18 (AV18) nucleon-nucleon (NN) potential supplemented with two different three-nucleon force models recently constructed to reproduce the binding energy of H, He and He nuclei as well as the neutron-deuteron doublet scattering length. We find that none of these new three-nucleon force models is able to reproduce simultaneously the empirical saturation point of symmetric nuclear matter and the properties of three- and four-nucleon systems.

    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    1502.01248 [pdf]
    PRC(2015)·34 citations
  5. 05

    [Submitted on 4 Feb 2015]

    Amplitude extraction in pseudoscalar-meson photoproduction: towards a situation of complete information

    Jannes Nys🇧🇪 · Tom Vrancx🇧🇪 · Jan Ryckebusch🇧🇪

    A complete set for pseudoscalar-meson photoproduction is a minimum set of observables from which one can determine the underlying reaction amplitudes unambiguously. The complete sets considered in this work involve single- and double-polarization observables. It is argued that for extracting amplitudes from data, the transversity representation of the reaction amplitudes offers advantages over alternate representations. It is shown that with the available single-polarization data for the p({\gamma},K^+)\Lambda reaction, the energy and angular dependence of the moduli of the normalized transversity amplitudes in the resonance region can be determined to a fair accuracy. Determining the relative phases of the amplitudes from double-polarization observables is far less evident.

    Comments:
    Accepted in JPhysG; Focus issue "Enhancing the interaction between nuclear experiment and theory through information and statistics" (ISNET)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1502.01259 [pdf]
    J.Phys.G(2015)·14 citations

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