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Nuclear Theory·nucl-th

Tuesday·March 31, 2015

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    [Submitted on 30 Mar 2015]

    Constraining nucleon high momentum in nuclei

    Gao-Chan Yong🇨🇳

    Recent studies at Jefferson Lab show that there are a certain proportion of nucleons in nuclei have momenta greater than the so-called nuclear Fermi momentum . Based on the transport model of nucleus-nucleus collisions at intermediate energies, nucleon high momentum caused by the neutron-proton short-range correlations in nuclei is constrained by comparing with and photon experimental data and considering some uncertainties. The high momentum cutoff value 2 is obtained.

    Comments:
    6 pages, 4 figures, to appear in PLB
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1503.08523 [pdf]
    PLB(2017)·44 citations
  2. 02

    [Submitted on 30 Mar 2015]

    Core-collapse supernova matter: light clusters, pasta phase and phase transitions

    Helena Pais🇵🇹 · Constança Providência🇵🇹 · William G. Newton🇺🇸 · Jirina R. Stone🇬🇧

    The pasta phase in core-collapse supernova matter (finite temperatures and fixed proton fractions) is studied within relativistic mean field models. Two different calculations are used for comparison, the Thomas-Fermi (TF) and the Coexisting Phases (CP) approximations. The effects of including light clusters in nuclear matter and the densities at which the transitions between pasta configurations and to uniform matter occur are also investigated. Finally, a comparison with a finite temperature Skyrme-Hartree-Fock calculation is drawn.

    Comments:
    Contribution for the Conference Proceedings of the "Compact Stars in the QCD Phase Diagram IV (CSQCD IV)", September 26-30, 2014, Prerow, Germany
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1503.08753 [pdf]
    2 citations
  3. 03

    [Submitted on 28 Mar 2015] (cross-list from nucl-ex)

    Dipole polarizability of 120Sn and nuclear energy density functionals

    T. Hashimoto · A. M. Krumbholz · P.-G. Reinhard · A. Tamii · P. von Neumann-Cosel · T. Adachi · N. Aoi · C. A. Bertulani · H. Fujita · Y. Fujita · E. Ganioǧlu · K. Hatanaka and 23 other authors

    The electric dipole strength distribution in 120Sn between 5 and 22 MeV has been determined at RCNP Osaka from a polarization transfer analysis of proton inelastic scattering at E_0 = 295 MeV and forward angles including 0{\deg}. Combined with photoabsorption data an electric dipole polarizability \alpha_D(120Sn) = 8.93(36) fm^3 is extracted. The dipole polarizability as isovector observable par excellence carries direct information on the nuclear symmetry energy and its density dependence. The correlation of the new value with the well established \alpha_D(208Pb) serves as a test of its prediction by nuclear energy density functionals (EDFs). Models based on modern Skyrme interactions describe the data fairly well while most calculations based on relativistic Hamiltonians cannot.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1503.08321 [pdf]
    PRC(2015)·106 citations
  4. 04

    [Submitted on 30 Mar 2015] (cross-list from astro-ph.CO)

    Can dark matter induce cosmological evolution of the fundamental constants of Nature?

    Y. V. Stadnik🇦🇺 · V. V. Flambaum🇦🇺

    We demonstrate that massive fields, such as dark matter, can directly produce a cosmological evolution of the fundamental constants of Nature. We show that a scalar or pseudoscalar (axion-like) dark matter field , which forms a coherently oscillating classical field and interacts with Standard Model particles via quadratic couplings in , produces `slow' cosmological evolution and oscillating variations of the fundamental constants. We derive limits on the quadratic interactions of with the photon, electron and light quarks from measurements of the primordial He abundance produced during Big Bang nucleosynthesis and recent atomic dysprosium spectroscopy measurements. These limits improve on existing constraints by up to 15 orders of magnitude. We also derive limits on the previously unconstrained linear and quadratic interactions of with the massive vector bosons from measurements of the primordial He abundance.

    Comments:
    7 pages. 1 figure. Version to appear in Physical Review Letters. This final version now includes also results amalgamated from our work arXiv:1504.01798
    Subjects:
    Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    1503.08540 [pdf]
    PRL(2015)·271 citations
  5. 05

    [Submitted on 30 Mar 2015] (cross-list from hep-ph)

    Erratum: Anisotropy in the EoS of Magnetized Quark Matter [Phys Rev C91, 065205 (2015)]

    Débora P. Menezes🇧🇷 · Marcus B. Pinto🇧🇷 · Constança Providência🇵🇹

    In this erratum we present the correct result for the magnetization of the three flavor Nambu--Jona-Lasinio model which was originally obtained by us in Phys Rev C91, 065205 (2015).

    Comments:
    A relevant recent reference has been added. Erratum: 3 pages, 8 figures. Manuscript: 17 pages, 18 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1503.08666 [pdf]
    PRC(2015)·35 citations

Affiliations

first authorsco-authorsvia INSPIRE