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Nuclear Theory·nucl-th

Thursday·June 16, 2016

11 papers—4 primary·7 cross-listed

All11Primary4Cross-lists7
  1. 01

    [Submitted on 15 Jun 2016]

    New results for reaction rate of the proton radiative capture on 3H

    S.B. Dubovichenko · A.V. Dzhazairov-Kakhramanov · N.V. Afanasyeva

    Calculations of the reaction rate of the proton radiative capture on 3H at temperatures from 0.01 T9 up to 5 T9, which are based on the theoretical results for the astrophysical S-factor and take into account the latest experimental data, were carried out. Theoretical results for the S-factor at energies from 1 keV up to 5 MeV were obtained in the framework of the modified potential cluster model with the classification of orbital states according to Young tableaux. On the basis of used nuclear model of the interaction of p and 3H particles there was shown possibility of description the latest experimental data for the S-factor at the energy range from 50 keV up to 5 MeV.

    Comments:
    16p., 3 fig, 55 ref
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1606.04617 [pdf]
    NPA(2017)·11 citations
  2. 02

    [Submitted on 15 Jun 2016]

    Nuclear medium effects in Drell-Yan process

    H. Haider🇮🇳 · M. Sajjad Athar🇮🇳 · S. K. Singh🇮🇳 · I. Ruiz Simo🇪🇸

    We study the nuclear medium effects in Drell-Yan process using quark parton distribution functions calculated in a microscopic nuclear model which takes into account the effects of Fermi motion, nuclear binding and nucleon correlations through a relativistic nucleon spectral function. The contributions of and mesons as well as shadowing effects are also included. The beam energy loss is calculated using a phenomenological approach. The present theoretical results are compared with the experimental results of E772 and E886 experiments. These results are applicable to the forthcoming experimental analysis of E906 Sea Quest experiment at Fermi Lab.

    Comments:
    17 pages, 12 figures. arXiv admin note: substantial text overlap with arXiv:1306.3829
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1606.04645 [pdf]
    J.Phys.G(2017)·12 citations
  3. 03

    [Submitted on 15 Jun 2016]

    Time-dependent density-functional description of nuclear dynamics

    Takashi Nakatsukasa · Kenichi Matsuyanagi · Masayuki Matsuo · Kazuhiro Yabana

    We present the basic concepts and recent developments in the time-dependent density functional theory (TDDFT) for describing nuclear dynamics at low energy. The symmetry breaking is inherent in nuclear energy density functionals (EDFs), which provides a practical description of important correlations at the ground state. Properties of elementary modes of excitation are strongly influenced by the symmetry breaking and can be studied with TDDFT. In particular, a number of recent developments in the linear response calculation have demonstrated their usefulness in description of collective modes of excitation in nuclei. Unrestricted real-time calculations have also become available in recent years, with new developments for quantitative description of nuclear collision phenomena. There are, however, limitations in the real-time approach; for instance, it cannot describe the many-body quantum tunneling. Thus, we treat the quantum fluctuations associated with slow collective motions assuming that time evolution of densities are determined by a few collective coordinates and momenta. The concept of collective submanifold is introduced in the phase space associated with the TDDFT and used to quantize the collective dynamics. Selected applications are presented to demonstrate the usefulness and quality of the new approaches. Finally, conceptual differences between nuclear and electronic TDDFT are discussed, with some recent applications to studies of electron dynamics in the linear response and under a strong laser field.

    Comments:
    57 pages, 15 figures, Review article
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1606.04717 [pdf]
    RMP(2016)·235 citations
  4. 04

    [Submitted on 15 Jun 2016]

    Adiabatic fission barriers in superheavy nuclei

    P. Jachimowicz · M. Kowal · J. Skalski

    Using the microscopic-macroscopic model based on the deformed Woods-Saxon single-particle potential and the Yukawa-plus-exponential macroscopic energy we calculated static fission barriers for 1305 heavy and superheavy nuclei , including even - even, odd - even, even - odd and odd - odd systems. For odd and odd-odd nuclei, adiabatic potential energy surfaces were calculated by a minimization over configurations with one blocked neutron or/and proton on a level from the 10-th below to the 10-th above the Fermi level. The parameters of the model that have been fixed previously by a fit to masses of even-even heavy nuclei were kept unchanged. A search for saddle points has been performed by the "Imaginary Water Flow" method on a basic five-dimensional deformation grid, including triaxiality. Two auxiliary grids were used for checking the effects of the mass asymmetry and hexadecapole non-axiallity. The ground states were found by energy minimization over configurations and deformations. We find that the non-axiallity significantly changes first and second fission barrier in many nuclei. The effect of the mass - asymmetry, known to lower the second, very deformed barriers in actinides, in the heaviest nuclei appears at the less deformed saddles in more than 100 nuclei. It happens for those saddles in which the triaxiallity does not play any role, what suggests a decoupling between effects of the mass-asymmetry and triaxiality. We studied also the influence of the pairing interaction strength on the staggering of for odd- and even-particle numbers. Finally, we provide a comparison of our results with other theoretical fission barrier evaluations and with available experimental estimates.

    Comments:
    submitted to PRC
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1606.04726 [pdf]
    PRC(2017)·65 citations

Affiliations

first authorsco-authorsvia INSPIRE