PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·August 30, 2017

10 papers—4 primary·6 cross-listed

All10Primary4Cross-lists6
  1. 01

    [Submitted on 29 Aug 2017]

    New Results on Short-Range Correlations in Nuclei

    Nadia Fomin🇺🇸 · Douglas Higinbotham🇺🇸 · Misak Sargsian🇺🇸 · Patricia Solvignon🇺🇸

    Nuclear dynamics at short distances is one of the most fascinating topics of strong interaction physics. The physics of it is closely related to the understanding the role of the QCD in generating nuclear forces at short distances as well as understanding the dynamics of the super-dense cold nuclear matter relevant to the interior of neutron stars. With an emergence of high energy electron and proton beams there is a significant recent progress in high energy nuclear scattering experiments aimed at studies of short-range structure of nuclei. This in turn stimulated new theoretical studies resulting in the observation of several new phenomena specific to the short range structure of nuclei. In this work we review recent theoretical and experimental progress in studies of short-range correlations in nuclei and their importance for advancing our understanding of the dynamics of nuclear interactions at small distances.

    Comments:
    Review article to be published in Annual Review of Nuclear and Particle Science, 32 pages and 8 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1708.08581 [pdf]
    Ann.Rev.Nucl.Part.Sci.(2017)·80 citations
  2. 02

    [Submitted on 29 Aug 2017]

    Isospin-symmetry breaking in superallowed Fermi beta-decay due to isospin-nonconserving forces

    K. Kaneko · Y. Sun · T. Mizusaki · S. Tazaki · S. K. Ghorui

    We investigate isospin-symmetry breaking effects in the sd-shell region with large-scale shell-model calculations, aiming to understand the recent anomalies observed in superallowed Fermi beta-decay. We begin with calculations of Coulomb displacement energies (CDE's) and triplet displacement energies (TDE's) by adding the T=1,J=0 isospin nonconserving (INC) interaction into the usual isospin-invariant Hamiltonian. It is found that CDE's and TDE's can be systematically described with high accuracy. A total number of 122 one- and two-proton separation energies are predicted accordingly, and locations of the proton drip-line and candidates for proton-emitters are thereby suggested. However, attempt to explain the anomalies in the superallowed Fermi beta-decay fails because these well-fitted T=1,J=0 INC interactions are found no effects on the nuclear matrix elements. It is demonstrated that the observed large isospin-breaking correction in the 32Cl beta-decay, the large isospin-mixing in the 31Cl beta-decay, and the small isospin-mixing in the 23Al beta-decay can be consistently understood by introducing additional T=1,J=2 INC interactions related to the s1/2 orbit.

    Comments:
    7 pages, 3 figures, accepted in Phys. Lett. B
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1708.08627 [pdf]
    PLB(2017)·33 citations
  3. 03

    [Submitted on 29 Aug 2017]

    Analysis of corrections to the eikonal approximation

    Chloë Hebborn · Pierre Capel

    Various corrections to the eikonal approximations are studied for two- and three-body nuclear collisions with the goal to extend the range of validity of this approximation to beam energies of 10 MeV/nucleon. Wallace's correction does not improve much the elastic-scattering cross sections obtained at the usual eikonal approximation. On the contrary, a semiclassical approximation that substitutes the impact parameter by a complex distance of closest approach computed with the projectile-target optical potential efficiently corrects the eikonal approximation. This opens the possibility to analyze data measured down to 10 MeV/nucleon within eikonal-like reaction models.

    Comments:
    10 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1708.08634 [pdf]
    PRC(2017)·11 citations
  4. 04

    [Submitted on 27 Aug 2017]

    A Minimal Nuclear Energy Density Functional

    Aurel Bulgac🇺🇸 · Michael McNeil Forbes🇺🇸 · Shi Jin🇺🇸 · Rodrigo Navarro Perez🇺🇸 · Nicolas Schunck🇺🇸

    We present a minimal nuclear energy density functional (NEDF) called "SeaLL1" that has the smallest number of possible phenomenological parameters to date. SeaLL1 is defined by 7 significant phenomenological parameters, each related to a specific nuclear property. It describes the nuclear masses of even-even nuclei with a mean energy error of 0.97 MeV and a standard deviation 1.46 MeV, two-neutron and two-proton separation energies with r.m.s. errors of 0.69 MeV and 0.59 MeV respectively, and the charge radii of 345 even-even nuclei with a mean error 0.022 fm and a standard deviation 0.025 fm. SeaLL1 incorporates constraints on the EoS of pure neutron matter from quantum Monte Carlo calculations with chiral effective field theory two-body (NN) interactions at N3LO level and three-body (NNN) interactions at the N2LO level. Two of the seven parameters are related to the saturation density and the energy per particle of the homogeneous symmetric nuclear matter, one is related to the nuclear surface tension, two are related to the symmetry energy and its density dependence, one is related to the strength of the spin-orbit interaction, and one is the coupling constant of the pairing interaction. We identify additional phenomenological parameters that have little effect on ground-state properties, but can be used to fine-tune features such as the Thomas-Reiche-Kuhn sum rule, the excitation energy of the giant dipole and Gamow-Teller resonances, the static dipole electric polarizability, and the neutron skin thickness.

    Comments:
    Updated to match published version. This article supersedes arXiv:1506.09195. Fit data provided in source files *.txt. (35 pages, 23 figures.)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1708.08771 [pdf]
    PRC(2018)·80 citations

Affiliations

first authorsco-authorsvia INSPIRE