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Nuclear Theory·nucl-th

Wednesday·March 14, 2018

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 01

    [Submitted on 13 Mar 2018]

    Calculation of multidimensional potential energy surfaces for even-even transuranium nuclei: Systematic investigation of the triaxiality effect on fission barrier

    Qing-Zhen Chai · Wei-Juan Zhao · Min-Liang Liu · Hua-Lei Wang

    Static fission barriers for 95 even-even transuranium nuclei with charge number have been systematically investigated by means of pairing self-consistent Woods-Saxon-Strutinsky calculations using the potential energy surface approach in multidimensional (, , ) deformation space. Taking the heavier Cf nucleus (with the available fission barrier from experiment) as an example, the formation of the fission barrier and the influence of macroscopic, shell and pairing correction energies on it are analyzed. The results of the present calculated values and barrier heights are compared with previous calculations and available experiments. The role of triaxiality in the region of the first saddle is discussed. It is found that the second fission barrier is also considerably affected by the triaxial deformation degree of freedom in some nuclei (e.g., the isotopes). Based on the potential energy curves, general trends of the evolution of the fission barrier heights and widths as a function of the nucleon numbers are investigated. In addition, the effects of Woods-Saxon potential parameter modifications (e.g., the strength of the spin-orbit coupling and the nuclear surface diffuseness) on the fission barrier are briefly discussed.

    Comments:
    12 pages, 8 figures, 1 table. It has been published in Chinese Physics C (2018)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1803.04616 [pdf]
    CPC(2018)·22 citations
  2. 02

    [Submitted on 13 Mar 2018]

    Coupled-channels analyses for Li + Pb fusion reactions with multi-neutron transfer couplings

    Ki-Seok Choi · Myung-Ki Ceoun · W. Y. So · K. Hagino · K. S. Kim

    We discuss the role of two-neutron transfer processes in the fusion reaction of the Li + Pb systems. We first analyze the Li + Pb reaction by taking into account the coupling to the Li + Pb channel. To this end, we assume that two neutrons are directly transferred to a single effective channel in Pb and solve the coupled-channels equations with the two channels. By adjusting the coupling strength and the effective -value, we successfully reproduce the experimental fusion cross sections for this system. We then analyze the Li + Pb reaction in a similar manner, that is, by taking into account three effective channels with Li + Pb, Li + Pb, and Li + Pb partitions. In order to take into account the halo structure of the Li nucleus, we construct the potential between Li and Pb with a double folding procedure, while we employ a Wood-Saxon type potential with the global Akyüz-Winther parameters for the other channels. Our calculation indicates that the multiple two-neutron transfer process plays a crucial role in the Li + Pb fusion reaction at energies around the Coulomb barrier.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1803.04618 [pdf]
    PLB(2018)·7 citations
  3. 03

    [Submitted on 13 Mar 2018]

    Ground state properties of and nuclei at equilibrium and at large static compression at zero temperature using Nijmegen and Reid Soft Core nucleon-nucleon interactions

    Iyad Alhagaish · Ali Abu-Nada · Feras Afaneh · Mahmoud Hasan

    In this paper, we investigate the ground state properties ( binding energy, nuclear radius, radial density distribution and single particle energies) for and nuclei at equilibrium and at large static compression at zero temperature by using two realistic different potentials namely, Nijmegen and Reid Soft Core (RSC)potentials. We carry out the calculations in No-Core Shell Model space consisting of six major oscillator shells within the framework of the Constrained Spherical Hartree- Fock (CSHF) approximations. We find out that, the computed equilibrium root mean square radii and the Hartree Fock energies for 4He and 12C with those two different potentials are very close to the experimental values of the nuclear radii and nuclear binding energies for the same nuclei.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1803.04650 [pdf]
    1 citation
  4. 04

    [Submitted on 13 Mar 2018]

    Gamow-Teller transitions and neutron-proton-pair transfer reactions

    P. Van Isacker🇫🇷 · A.O. Macchiavelli🇺🇸

    We propose a schematic model of nucleons moving in spin--orbit partner levels, , to explain Gamow--Teller and two-nucleon transfer data in nuclei above Ca. Use of the coupling scheme provides a more transparent approach to interpret the structure and reaction data.We apply the model to the analysis of charge-exchange, Ca(He,t)Sc, and np-transfer, Ca(He,p)Sc, reactions data to define the elementary modes of excitation in terms of both isovector and isoscalar pairs, whose properties can be determined by adjusting the parameters of the model (spin--orbit splitting, isovector pairing strength and quadrupole matrix element) to the available data. The overall agreement with experiment suggests that the approach captures the main physics ingredients and provides the basis for a boson approximation that can be extended to heavier nuclei. Our analysis also reveals that the SU(4)-symmetry limit is not realized in Sc.

    Comments:
    9 pages, 1 figure
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1803.04704 [pdf]
    PLB(2018)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE