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Nuclear Theory·nucl-th

Wednesday·July 13, 2016

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    [Submitted on 12 Jul 2016]

    A nucleus-dependent valence-space approach to nuclear structure

    S. R. Stroberg🇨🇦 · A. Calci🇨🇦 · H. Hergert🇺🇸 · J. D. Holt🇨🇦 · S. K. Bogner🇺🇸 · R. Roth🇩🇪 · A. Schwenk🇩🇪

    We present a nucleus-dependent valence-space approach for calculating ground and excited states of nuclei, which generalizes the shell-model in-medium similarity renormalization group to an ensemble reference with fractionally filled orbitals. Because the ensemble is used only as a reference, and not to represent physical states, no symmetry restoration is required. This allows us to capture 3N forces among valence nucleons with a valence-space Hamiltonian specifically targeted to each nucleus of interest. Predicted ground-state energies from carbon through nickel agree with results of other large-space ab initio methods, generally to the 1\% level. In addition, we show that this new approach is required in order to obtain convergence for nuclei in the upper and shells. Finally, we address the / ground-state inversion problem in and . This approach extends the reach of ab initio nuclear structure calculations to essentially all light- and medium-mass nuclei.

    Comments:
    6 pages, 5 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1607.03229 [pdf]
    PRL(2017)·308 citations
  2. 02

    [Submitted on 12 Jul 2016]

    Compact Star Matter: EoS with New Scaling Law

    Kyungmin Kim🇰🇷 · Hyun Kyu Lee🇰🇷 · Jaehyun Lee🇰🇷

    In this paper we present a simple discussion on the properties of compact stars using an EoS obtained in effective field theory anchored on scale and hidden-local symmetric Lagrangian endowed with topology change and a unequivocal prediction on the deformation of the compact star, that could be measured in gravitational waves. The objective is not to offer a superior or improved EoS for compact stars but to confront with a forthcoming astrophysical observable the given model formulated in what is considered to be consistent with the premise of QCD. The model so obtained is found to satisfactorily describe the observation of a 2-solar mass neutron star with a minimum number of parameters. Specifically the observable we are considering in this paper is the tidal deformability parameter (equivalently the Love number k_2), which affects gravitational wave forms at the late period of inspiral stage. The forthcoming aLIGO and aVirgo observations of gravitational waves from binary neutron star system will provide a valuable guidance for arriving at a better understanding of highly compressed baryonic matter.

    Comments:
    14 pages, 4 figures, to appaer in G.E. Brown Memorial Volume. arXiv admin note: substantial text overlap with arXiv:1412.5380
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1607.03235 [pdf]
    IJMPE(2017)·9 citations
  3. 03

    [Submitted on 12 Jul 2016]

    Volume and surface contributions to the nuclear symmetry energy within the coherent density fluctuation model

    A. N. Antonov · M. K. Gaidarov · P. Sarriguren · E. Moya de Guerra

    The volume and surface components of the nuclear symmetry energy (NSE) and their ratio are calculated within the coherent density fluctuation model (CDFM). The estimations use the results of the model for the NSE in finite nuclei based on the Brueckner energy-density functional for nuclear matter. In addition, we present results for the NSE and its volume and surface contributions obtained by using the Skyrme energy-density functional. The CDFM weight function is obtained using the proton and neutron densities from the self-consistent HF+BCS method with Skyrme interactions. We present and discuss the values of the volume and surface contributions to the NSE and their ratio obtained for the Ni, Sn, and Pb isotopic chains studying their isotopic sensitivity. The results are compared with estimations of other approaches which have used available experimental data on binding energies, neutron-skin thicknesses, excitation energies to isobaric analog states (IAS) and also with results of other theoretical methods.

    Comments:
    13 pages, 12 figures, 3 tables, accepted for publication in Physical Review C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1607.03325 [pdf]
    PRC(2016)·30 citations

Affiliations

first authorsco-authorsvia INSPIRE