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Nuclear Theory·nucl-th

Thursday·September 8, 2016

13 papers—6 primary·7 cross-listed

All13Primary6Cross-lists7
  1. 01

    [Submitted on 6 Sept 2016]

    Partial-Wave Analysis of Nucleon-Nucleon Elastic Scattering Data

    Ron L. Workman🇺🇸 · William J. Briscoe🇺🇸 · Igor I. Strakovsky🇺🇸

    Energy-dependent and single-energy fits to the existing nucleon-nucleon database have been updated to incorporate recent measurements. The fits cover a region from threshold to 3 GeV, in the laboratory kinetic energy, for proton-proton scattering, with an upper limit of 1.3 GeV for neutron-proton scattering. Experiments carried out at the COSY-WASA and COSY-ANKE facilities have had a significant impact on the partial-wave solutions. Results are discussed in terms of both partial-wave and direct reconstruction amplitudes.

    Comments:
    15 pages, 14 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1609.01741 [pdf]
    PRC(2016)·53 citations
  2. 02

    [Submitted on 6 Sept 2016]

    Quantal Nucleon Diffusion I: Central Collisions of Symmetric Nuclei

    S. Ayik · O. Yilmaz · B. Yilmaz · A. S. Umar

    Quantal diffusion mechanism of nucleon exchange is studied in the central collisions of several symmetric heavy-ion collisions in the framework of the Stochastic Mean-Field (SMF) approach. Since at bombarding energies below the fusion barrier, di-nuclear structure is maintained, it is possible to describe nucleon exchange as a diffusion process familiar from deep-inelastic collisions. Quantal diffusion coefficients, including memory effects, for proton and neutron exchanges are extracted microscopically employing the SMF approach. The quantal calculations of neutron and proton variances are compared with the semi-classical results.

    Comments:
    9 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1609.01772 [pdf]
    17 citations
  3. 03

    [Submitted on 7 Sept 2016]

    Event-by-event generation of vorticity in heavy-ion collisions

    Wei-Tian Deng🇨🇳 · Xu-Guang Huang🇺🇸

    In a noncentral heavy-ion collision, the two colliding nuclei have finite angular momentum in the direction perpendicular to the reaction plane. After the collision, a fraction of the total angular momentum is retained in the produced hot quark-gluon matter and is manifested in the form of fluid shear. Such fluid shear creates finite flow vorticity. We study some features of such generated vorticity, including its strength, beam energy dependence, centrality dependence, and spatial distribution.

    Comments:
    V1: 4 pages,3 figures. Contribution to the Proceedings of SQM2016, Berkeley, California, USA, June 27 - July 01, 2016
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1609.01801 [pdf]
    J.Phys.Conf.Ser.(2017)·8 citations
  4. 04

    [Submitted on 7 Sept 2016]

    Relativistic Brueckner-Hartree-Fock theory for finite nuclei

    Shihang Shen · Jinniu Hu · Haozhao Liang · Jie Meng · Peter Ring · Shuangquan Zhang

    Starting with a bare nucleon-nucleon interaction, for the first time the full relativistic Brueckner-Hartree-Fock equations are solved for finite nuclei in a Dirac-Woods-Saxon basis. No free parameters are introduced to calculate the ground-state properties of finite nuclei. The nucleus O is investigated as an example. The resulting ground-state properties, such as binding energy and charge radius, are considerably improved as compared with the non-relativistic Brueckner-Hartree-Fock results and much closer to the experimental data. This opens the door for \emph{ab initio} covariant investigations of heavy nuclei.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1609.01866 [pdf]
    Chin.Phys.Lett.(2016)·57 citations
  5. 05

    [Submitted on 7 Sept 2016]

    Spectra and elliptic flow of thermal photons from full overlap U+U collisions at RHIC

    Pingal Dasgupta🇮🇳 · Rupa Chatterjee🇮🇳 · Dinesh K. Srivastava🇮🇳

    We calculate spectra and elliptic flow for tip-tip and body-body configurations of full overlap uranium-uranium (U+U) collisions using a hydrodynamic model with smooth initial density distribution and compare the results with those obtained from Au+Au collisions at RHIC. Production of thermal photons is seen to be significantly larger for tip-tip collisions compared to body-body collisions of uranium nuclei in the region 1 GeV. The thermal photon spectrum from body-body collisions is found to be close to the spectrum from most central Au+Au collisions at RHIC. The elliptic flow parameter calculated for body-body collisions is found to be large and comparable to the for mid-central collisions of Au nuclei. On the other hand, as expected, the is close to zero for tip-tip collisions. The qualitative nature of the photon spectra and elliptic flow for the two different orientations of uranium nuclei is found to be independent of the initial parameters of the model calculation. We show that the photon results from fully overlapping U+U collisions are complementary to the results from Au+Au collisions at RHIC.

    Comments:
    7 pages, 6 figures, Discussions and references added. To appear in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1609.01949 [pdf]
    PRC(2017)·20 citations
  6. 06

    [Submitted on 7 Sept 2016]

    Nucleus--nucleus interactions in the inner crust of neutron stars

    D. Kobyakov · C. J. Pethick

    The interaction between nuclei in the inner crust of neutron stars consists of two contributions, the so-called "direct" interaction and an "induced" one due to density changes in the neutron fluid. For large nuclear separations the contributions from nuclear forces to each of these terms are shown to be nonzero. In the static limit they are equal in magnitude but have opposite signs and they cancel exactly. We analyze earlier results on effective interactions in the light of this finding. We consider the properties of long-wavelength collective modes and, in particular, calculate the degree of mixing between the lattice phonons and the phonons in the neutron superfluid. Using microscopic theory, we calculate the net non-Coulombic contribution to the nucleus--nucleus interaction and show that, for large , the leading term is due to exchange of two phonons and varies as : it is an analog of the Casimir--Polder interaction between neutral atoms.

    Comments:
    11 pages, 4 figures, 3 tables
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    1609.01976 [pdf]
    PRC(2016)·19 citations

Affiliations

first authorsco-authorsvia INSPIRE