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Nuclear Theory·nucl-th

Monday·February 26, 2018

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    Quark-Meson-Coupling (QMC) model for finite nuclei, nuclear matter and beyond

    P. A. M. Guichon🇫🇷 · J. R. Stone🇬🇧 · A. W. Thomas🇦🇺

    The Quark-Meson-Coupling model, which self-consistently relates the dynamics of the internal quark structure of a hadron to the relativistic mean fields arising in nuclear matter, provides a natural explanation to many open questions in low energy nuclear physics, including the origin of many-body nuclear forces and their saturation, the spin-orbit interaction and properties of hadronic matter at a wide range of densities up to those occurring in the cores of neutron stars. Here we focus on four aspects of the model (i) a full comprehensive survey of the theory, including the latest developments, (ii) extensive application of the model to ground state properties of finite nuclei and hypernuclei, with a discussion of similarities and differences between the QMC and Skyrme energy density functionals, (iii) equilibrium conditions and composition of hadronic matter in cold and warm neutron stars and their comparison with the outcome of relativistic mean-field theories and, (iv) tests of the fundamental idea that hadron structure changes in-medium.

    nucl-thhep-phPPNP(2018)·104 citations
  2. 02

    Implications of Neutron Star Properties for the Existence of Light Dark Matter

    T. F. Motta🇦🇺 · P. A. M. Guichon🇫🇷 · A. W. Thomas🇦🇺

    It was recently suggested that the discrepancy between two methods of measuring the lifetime of the neutron may be a result of an unseen decay mode into a dark matter particle which is almost degenerate with the neutron. We explore the consequences of this for the properties of neutron stars, finding that their known properties are in conflict with the existence of such a particle.

    nucl-thhep-phJ.Phys.G(2018)·77 citations
  3. 03

    The electric quadrupole channel of the 7.8 eV transition

    Pavlo V. Bilous · Nikolay Minkov · Adriana Pálffy

    The unique isomeric transition at 7.8 eV in has a magnetic dipole () and an electric quadrupole () multipole mixing. So far, the component has been widely disregarded. Here, we investigate the nuclear physics nature and the impact of the decay channel for the nuclear coupling to the atomic shell based on the newest theoretical predictions for the corresponding reduced nuclear transition probabilities. Our results show that the contribution of the channel is dominant or at least of the same order of magnitude for internal conversion or electronic bridge transitions involving the atomic orbitals , and . Notable exceptions are the internal conversion of the electron and the electronic bridge between the electronic states and , for which the component dominates by two to three orders of magnitude. Caution is therefore advised when considering isomeric excitation or decay via nuclear coupling to the atomic shell, as the involved orbitals determine which multipole transition component dominates.

    nucl-thphysics.atom-phPRC(2018)·22 citations
  4. 04

    Few- and many-nucleon systems with semilocal coordinate-space regularized chiral nucleon-nucleon forces

    S. Binder · A. Calci · E. Epelbaum · R.J. Furnstahl · J. Golak · K. Hebeler · T. Hüther · H. Kamada · H. Krebs · P. Maris · U.-G. Meißner · A. Nogga and 6 other authors

    We employ a variety of ab initio methods including Faddeev-Yakubovsky equations, No-Core Configuration Interaction Approach, Coupled-Cluster Theory and In-Medium Similarity Renormalization Group to perform a comprehensive analysis of the nucleon-deuteron elastic and breakup reactions and selected properties of light and medium-mass nuclei up to 48Ca using the recently constructed semilocal coordinate-space regularized chiral nucleon-nucleon potentials. We compare the results with those based on selected phenomenological and chiral EFT two-nucleon potentials, discuss the convergence pattern of the chiral expansion and estimate the achievable theoretical accuracy at various chiral orders using the novel approach to quantify truncation errors of the chiral expansion without relying on cutoff variation. We also address the robustness of this method and explore alternative ways to estimate the theoretical uncertainty from the truncation of the chiral expansion.

    nucl-thPRC(2018)·95 citations

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first authorsco-authorsvia INSPIRE