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Nuclear Theory·nucl-th

Friday·July 28, 2017

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 01

    [Submitted on 26 Jul 2017]

    Phenomenology of collinear photon emission from quark-gluon plasma in collisions

    B.G. Zakharov🇷🇺

    We study the role of running coupling and the effect of variation of the thermal quark mass on contribution of the collinear bremsstrahlung and annihilation to photon emission in collisions in a scheme similar to that used in our previous jet quenching analyses. We find that for a scenario with the thermal quark mass MeV contribution of the higher order collinear processes summed with the processes can explain a considerable part (\%) of the experimental photon spectrum at GeV for Au+Au collisions at TeV. But for MeV and for the thermal quark mass predicted by the HTL scheme the theoretical predictions underestimate considerably the experimental spectrum.

    Comments:
    6 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1707.08602 [pdf]
    JETP Lett.(2017)·5 citations
  2. 02

    [Submitted on 26 Jul 2017]

    Solution of Hartree-Fock-Bogoliubov equations and fitting procedure using N2LO Skyrme pseudo-potential in spherical symmetry

    P. Becker🇫🇷 · D. Davesne🇫🇷 · J. Meyer🇫🇷 · J. Navarro🇪🇸 · A. Pastore🇬🇧

    We present the development of the extended Skyrme N2LO pseudo-potential in the case of spherical even-even nuclei calculations. The energy density functional is first presented. Then we derive the mean-field equations and discuss the numerical method used to solve the resulting fourth-order differential equation together with the behaviour of the solutions at the origin. Finally, a fitting procedure for such a N2LO interaction is discussed and we provide a first parametrization. Typical ground-state observables are calculated and compared against experimental data.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1707.08622 [pdf]
    PRC(2017)·39 citations
  3. 03

    [Submitted on 27 Jul 2017]

    Density Functional approach for multi-strange hypernuclei: competition between and hyperons

    J. Margueron🇺🇸 · E. Khan🇫🇷 · F. Gulminelli🇫🇷

    The question of the competition between and in the ground-state of multi-strange hypernuclei is addressed within a non-relativistic density functional approach, partially constrained by ab-initio calculations and experimental data. The exploration of the nuclear chart for as a function of the strangeness number is performed by adding hyperons to a nuclear core imposing either conserved total charge or conserved proton number . We find that almost all hypernuclei present an instability with respect to the strong interaction decay of towards and that most of the instabilities generates (resp. ) in the case of conserved total charge (resp. proton number ). The strangeness number at which the first appear is generally lower for configurations explored in the case of conserved compared to the case of conserved , and corresponds to the crossing between the and the neutron or proton chemical potentials. About two to three hundred thousands pure hypernuclei may exist before the onset of . The largest uncertainty comes from the unknown interaction, since the and the ones can be constrained by a few experimental data. The uncertainty on the interaction can still modify the previous estimation by 30-40\%, while the impact of the unknown interaction is very weak.

    Comments:
    version 2
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1707.08700 [pdf]
    PRC(2017)·19 citations
  4. 04

    [Submitted on 27 Jul 2017]

    Electron and Nucleon Localization Functions of Oganesson: Approaching the Thomas-Fermi Limit

    Paul Jerabek · Bastian Schuetrumpf · Peter Schwerdtfeger · Witold Nazarewicz

    Fermion localization functions are used to discuss electronic and nucleonic shell structure effects in the superheavy element oganesson, the heaviest element discovered to date. Spin-orbit splitting in the electronic shell becomes so large ( 10 eV) that Og is expected to show uniform-gas-like behavior in the valence region with a rather large dipole polarizability compared to the lighter rare gas elements. The nucleon localization in Og is also predicted to undergo a transition to the Thomas-Fermi gas behavior in the valence region. This effect, particularly strong for neutrons, is due to the high density of single-particle orbitals.

    Comments:
    5 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    1707.08710 [pdf]
    PRL(2018)·41 citations
  5. 05

    [Submitted on 27 Jul 2017]

    A new single-particle basis for nuclear many-body calculations

    Giovanni Puddu

    Predominantly, harmonic oscillator single-particle wave functions are the choice as a basis in ab-initio nuclear many-body calculations. These wave-functions, although very convenient in order to evaluate the matrix elements of the interaction in the laboratory frame, have a too fast fall-off at large distances. In the past, in alternative to the harmonic oscillator, other single-particle wave functions have been proposed. In this work we propose a new single-particle basis, directly linked to the nucleon-nucleon interaction. This new basis is orthonormal and complete, has the proper asymptotic behavior at large distances and does not contain the continuum which would pose severe convergence problems in nuclear many body calculations. We consider the newly proposed NNLO-opt nucleon-nucleon interaction, without any renormalization. We show that unlike other basis, this single-particle representation has a computational cost similar to the harmonic oscillator basis with the same space truncation and it gives lower energies for and .

    Comments:
    27 pages 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1707.08765 [pdf]
    J.Phys.G(2017)·6 citations
  6. 06

    [Submitted on 27 Jul 2017]

    Structure and decays of nuclear three-body systems: the Gamow coupled-channel method in Jacobi coordinates

    S.M. Wang · N. Michel · W. Nazarewicz · F.R. Xu

    Weakly bound and unbound nuclear states appearing around particle thresholds are prototypical open quantum systems. Theories of such states must take into account configuration mixing effects in the presence of strong coupling to the particle continuum space. To describe structure and decays of three-body systems, we developed a Gamow coupled-channel (GCC) approach in Jacobi coordinates by employing the complex-momentum formalism. We benchmarked the new framework against the complex-energy Gamow Shell Model (GSM). The GCC formalism is expressed in Jacobi coordinates, so that the center-of-mass motion is automatically eliminated. To solve the coupled-channel equations, we use hyperspherical harmonics to describe the angular wave functions while the radial wave functions are expanded in the Berggren ensemble, which includes bound, scattering and Gamow states. We show that the GCC method is both accurate and robust. Its results for energies, decay widths, and nucleon-nucleon angular correlations are in good agreement with the GSM results. We have demonstrated that a three-body GSM formalism explicitly constructed in cluster-orbital shell model coordinates provides similar results to a GCC framework expressed in Jacobi coordinates, provided that a large configuration space is employed. Our calculations for systems and O show that nucleon-nucleon angular correlations are sensitive to the valence-neutron interaction. The new GCC technique has many attractive features when applied to bound and unbound states of three-body systems: it is precise, efficient, and can be extended by introducing a microscopic model of the core.

    Comments:
    10 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1707.08954 [pdf]
    PRC(2017)·51 citations

Affiliations

first authorsco-authorsvia INSPIRE