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Nuclear Theory·nucl-th

Monday·February 17, 2020

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 01

    [Submitted on 14 Feb 2020]

    Description of Four- and Five-Nucleon Systems by Solving Faddeev-Yakubovsky Equations in Configuration Space

    Rimantas Lazauskas🇫🇷 · Jaume Carbonell🇫🇷

    The Faddeev Yakubovsky equations constitute a rigorous formulation of the quantum mechanical N body problem in the framework of non relativistic dynamics. They allow the exact solutions of the Schrodinger equation for bound and scattering states to be obtained. In this review, we will present the general formalism as well as the numerical tools we use to solve Faddeev Yakubovsky equations in configuration space. We will consider in detail the description of the four and five nucleon systems based on modern realistic nuclear Hamiltonians. Recent achievements in this domain will be summarized. Some of the still controversial issues related with the nuclear Hamiltonians as well as the numerical methods traditionally employed to solve few nucleon problems will be highlighted.

    Comments:
    Published in Frontiers in Physics 7:251 (2020)
    Subjects:
    Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    2002.05876 [pdf]
    Front.in Phys.(2020)·41 citations
  2. 02

    [Submitted on 14 Feb 2020]

    Ab initio calculation of the electron capture spectrum of 163Ho: Auger-Meitner decay into continuum states

    M. Brass🇩🇪 · M.W. Haverkort🇩🇪

    Determining the electron neutrino mass by electron capture in Ho relies on an accurate understanding of the differential electron capture nuclear decay rate as a function of the distribution of the total decay energy between the neutrino and electronic excitations. The resulting spectrum is dominated by resonances due to local atomic multiplet states with core holes. Coulomb scattering between electrons couple the discrete atomic states, via Auger-Meitner decay, to final states with free electrons. The atomic multiplets are above the auto-ionisation energy, such that the delta functions representing these discrete levels turn into a superposition of Lorentzian, Mahan- and Fano-like line-shapes. We present an \textit{ab initio} method to calculate nuclear decay modifications due to such processes. It includes states with multiple correlated holes in local atomic orbitals interacting with unbound Auger-Meitner electrons. A strong energy-dependent, asymmetric broadening of the resonances in good agreement with recent experiments is found. We present a detailed analysis of the mechanisms determining the final spectral line-shape and discuss both the Fano interference between different resonances, as well as the energy dependence of the Auger-Meitner Coulomb matrix elements. The latter mechanism is shown to be the dominant channel responsible for the asymmetric line-shape of the resonances in the electron capture spectrum of Ho.

    Subjects:
    Nuclear Theory (nucl-th); Strongly Correlated Electrons (cond-mat.str-el)
    arXiv:
    2002.05989 [pdf]
    New J.Phys.(2020)·26 citations
  3. 03

    [Submitted on 14 Feb 2020]

    Clustering structure effect on Hanbury-Brown-Twiss correlation in C + Au collisions at 200 GeV}

    Junjie He🇨🇳 · Song Zhang🇨🇳 · Yu-Gang Ma🇨🇳 · Jinhui Chen🇨🇳 · Chen Zhong🇨🇳

    Through C + Au collisions at 200 GeV using a multiphase transport (AMPT) model, the azimuthal angle dependences of the Hanbury Brown-Twiss (HBT) radii relative to the second- and third-order participant plane from - correlations are discussed. Three initial geometric configurations of C, namely three--cluster triangle, three--cluster chain and Woods-Saxon distribution of nucleons, are taken into account, and their effects on the correlations are investigated. The ratio of the third- to the second-order HBT radii is shown to be a clear probe for three configurations. In addition, this work presents the hadronic rescattering time evolution of the azimuthally dependent HBT radii. From the present study, one can learn that the HBT correlation from identical particles at freeze-out is able to provide the information of different initial configurations as collective flow proposed before.

    Comments:
    11 pages, 6 figures, 3 tables
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2002.06058 [pdf]
    EPJA(2020)·25 citations
  4. 04

    [Submitted on 14 Feb 2020]

    Dispersive optical model description of nucleon scattering on Pb-Bi isotopes

    Xiuniao Zhao · Weili Sun · R. Capote · E.Sh. Soukhovitski\~ı · D.S. Martyanov · J.M. Quesada

    A recently derived dispersive optical model potential (DOMP) for Pb is extended to consider the non-locality in the real potential and the shell-gap in the definition of the nuclear imaginary potentials near the Fermi energy. The modified DOMP improves the simultaneous description of nucleon scattering on Pb and of the Pb particle-hole bound states. The new potential is shown to give a very good description of nucleon scattering data on near-magic targets Pb and Bi.

    Comments:
    9 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2002.06065 [pdf]
    PRC(2020)·10 citations
  5. 05

    [Submitted on 14 Feb 2020]

    Nucleon-number scalings of anisotropic flows and nuclear modification factor for light nuclei in the squeeze-out region

    T. T. Wang🇨🇳 · Y. G. Ma🇨🇳

    The number of nucleon (NN) scaling of the directed flow and elliptic flow () as well as the nuclear modification factor () are tested for light nuclei which are produced in 0.4 GeV collisions at different impact parameters with two different in-medium nucleon-nucleon cross sections in the framework of an isospin-dependent quantum molecular dynamics (IQMD) model. In that energy domain, the emission of light nuclei can be well described by the squeeze-out phenonomenon. The results show a nice NN scaling behavior for flow parameters , and . These results demonstrate that the nucleon coalescence mechanism is responsible for nucleon-number scaling of above physical observables in squeeze-out region in heavy-ion collisions at intermediate energy.

    Comments:
    8 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2002.06067 [pdf]
    EPJA(2019)·10 citations
  6. 06

    [Submitted on 14 Feb 2020]

    Three-nucleon force effects in inclusive spectra of the neutron-deuteron breakup reaction

    H. Witała · J. Golak · R. Skibiński · V. Soloviov · K. Topolnicki

    We investigate the sensitivity of the non-exclusive nucleon induced deuteron breakup reaction to the three-nucleon interaction and distributions of three-nucleon force effects in inclusive spectra. To this end we solve the three-nucleon Faddeev equation at a number of incoming nucleon laboratory energies using the CD Bonn nucleon-nucleon interaction alone or combined with the 2{\pi}-exchange Tucson-Melbourne three-nucleon force. Based on these solutions energy spectra of an outgoing nucleon, at a specified detection angle as well as spectra integrated over that angle, are calculated. By integrating the spectra at a given angle over the energy of the outgoing nucleon the angular distributions of three-nucleon force effects in the breakup process are additionally obtained. Contrary to elastic nucleon-deuteron scattering, where at higher energies significant three-nucleon force effects were encountered for scattering angles around the minimum of the cross section, for the breakup process only moderate effects are found and they are restricted to forward angles. Results of the present investigation show that the large three-nucleon force effects found for some specific complete breakup configurations are reduced substantially in the incomplete spectra when averaging over contributing complete geometries is performed.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2002.06087 [pdf]
    PRC(2020)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE