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Nuclear Theory·nucl-th

Friday·June 24, 2016

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 01

    [Submitted on 22 Jun 2016]

    Magnetic hyperfine structure of the ground-state doublet in highly charged ions Th and the Bohr-Weisskopf effect

    E.V. Tkalya · A.V. Nikolaev

    The magnetic hyperfine (MHF) structure of the (0.0 eV) ground state and the low-lying (7.8 eV) isomeric state of the Th nucleus in highly charged ions Th and Th is calculated. The distribution of the nuclear magnetization (the Bohr-Weisskopf effect) is accounted for in the framework of the collective nuclear model with the wave functions of the Nilsson model for the unpaired neutron. The deviations of the MHF structure for the ground and isomeric states from their values in the model of point-like nuclear magnetic dipole are calculated. The influence of the mixing of the states with the same quantum number on the energy of sublevels is studied. Taking into account the mixing of states, the probabilities of the transitions between the components of MHF structure are found.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1606.07105 [pdf]
    PRC(2016)·12 citations
  2. 02

    [Submitted on 23 Jun 2016]

    Quark-Pauli effects in three octet-baryons

    C. Nakamoto🇯🇵 · Y. Suzuki🇯🇵

    To sustain a neutron star with about two times the solar mass, multi baryons including hyperons are expected to produce repulsive effects in the interior of its high baryon-density region. To examine possible quark-Pauli repulsion among the baryons, we solve the eigenvalue problem of the quark antisymmetrizer for three octet-baryons that are described by most compact spatial configurations. We find that the Pauli blocking effect is weak in the system, while it is strong in the system. The appearance of the hyperon is suppressed in the neutron star interior but no quark-Pauli repulsion effectively works for the hyperon.

    Comments:
    9 pages, plus 7 pages as Supplemental Material
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1606.07225 [pdf]
    PRC(2016)·8 citations
  4. 04

    [Submitted on 23 Jun 2016]

    Transfer reaction code with nonlocal interactions

    L. J. Titus · A. Ross · F. M. Nunes

    We present a suite of codes (NLAT for nonlocal adiabatic transfer) to calculate the transfer cross section for single-nucleon transfer reactions, or , including nonlocal nucleon-target interactions, within the adiabatic distorted wave approximation. For this purpose, we implement an iterative method for solving the second order nonlocal differential equation, for both scattering and bound states. The final observables that can be obtained with NLAT are differential angular distributions for the cross sections of or . Details on the implementation of the T-matrix to obtain the final cross sections within the adiabatic distorted wave approximation method are also provided. This code is suitable to be applied for deuteron induced reactions in the range of MeV, and provides cross sections with accuracy.

    Comments:
    35 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1606.07341 [pdf]
    Comput.Phys.Commun.(2016)·29 citations
  5. 05

    [Submitted on 23 Jun 2016]

    Examining the effect of nonlocality in transfer reactions

    A. Ross · L. J. Titus · F. M. Nunes

    Background: In the last year we have been exploring the effect of the explicit inclusion of nonlocality in (d,p) reactions. Purpose: The goal of this work is to extend previous studies to (d,n) reactions, which, although similar to (d,p), have specific properties that merit inspection. Method: We apply our methods (both the distorted wave Born approximation and the adiabatic wave approximation) to reactions on O, Ca, Ca, Sn, Sn, and Pb at and MeV. Results: We look separately at the modifications introduced by nonlocality in the final bound and scattering states, as well as the consequences reflected on the differential angular distributions. The cross sections obtained when using nonlocality explicitly are significantly different than those using the local approximation, just as in (d,p). Due to the particular role of Coulomb in the bound state, often we found the effects of nonlocality to be larger in (d,n) than in (d,p). Conclusions: Our results confirm the importance of including nonlocality explicitly in deuteron induced reactions.

    Comments:
    6 pages, 4 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1606.07344 [pdf]
    PRC(2016)·16 citations

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