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Nuclear Theory·nucl-th

Thursday·March 5, 2015

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 01

    [Submitted on 4 Mar 2015]

    The isospin quartic term in the kinetic energy of neutron-rich nucleonic matter

    Bao-Jun Cai · Bao-An Li

    The energy of a free gas of neutrons and protons is well known to be approximately isospin parabolic with a negligibly small quartic term of only MeV at the saturation density of nuclear matter . Using an isospin-dependent single-nucleon momentum distribution including a high (low) momentum tail (depletion) with its shape parameters constrained by recent high-energy electron scattering and medium-energy nuclear photodisintegration experiments as well as the state-of-the-art calculations of the deuteron wave function and the equation of state of pure neutron matter near the unitary limit within several modern microscopic many-body theories, we show for the first time that the kinetic energy of interacting nucleons in neutron-rich nucleonic matter has a significant quartic term of . Such a large quartic term has significant ramifications in determining the equation of state of neutron-rich nucleonic matter using both terrestrial and astrophysical observables.

    Comments:
    Discussions and references added. Version accepted as a Rapid Communication in PRC
    Subjects:
    Nuclear Theory (nucl-th); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Experiment (nucl-ex)
    arXiv:
    1503.01167 [pdf]
    PRC(2015)·47 citations
  2. 02

    [Submitted on 4 Mar 2015]

    Nuclear -decay half-lives in the relativistic point-coupling model

    Z. Y. Wang · Z. M. Niu · Y. F. Niu · J. Y. Guo

    The self-consistent proton-neutron quasiparticle random phase approximation approach is employed to calculate -decay half-lives of neutron-rich even-even nuclei with . A newly proposed nonlinear point-coupling effective interaction PC-PK1 is used in the calculations. It is found that the isoscalar proton-neutron pairing interaction can significantly reduce -decay half-lives. With an isospin-dependent isoscalar proton-neutron pairing strength, our results well reproduce the experimental -decay half-lives, although the pairing strength is not adjusted using the half-lives calculated in this study.

    Comments:
    5 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1503.01222 [pdf]
    J.Phys.G(2016)·28 citations
  3. 03

    [Submitted on 4 Mar 2015]

    Extended Skyrme pseudo-potential deduced from infinite matter properties

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

    We discuss the contributions to the Equation of State for the NLO Skyrme pseudo-potential (=2,3). We show that by adding 4th and 6th order gradient terms, it is possible to fairly reproduce the spin/isospin decomposition of an equation of state obtained from \emph{ab-initio} methods. Moreover, by inspecting the partial-wave decomposition of the equation of state, we show for the first time a possible way to add explicit constraints on the sign of the tensor terms of the Skyrme interaction.

    Comments:
    6 pages, 2 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1503.01370 [pdf]
    PRC(2015)·26 citations

Affiliations

first authorsco-authorsvia INSPIRE