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Nuclear Theory·nucl-th

Tuesday·March 24, 2015

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    [Submitted on 21 Mar 2015]

    A microscopic approach to He scattering

    Masakazu Toyokawa · Takuma Matsumoto · Kosho Minomo · Masanobu Yahiro

    We propose a practical folding model to describe He elastic scattering. In the model, He optical potentials are constructed by making the folding procedure twice. First the nucleon-target potential is evaluated by folding the Melbourne -matrix with the target density and localizing the nonlocal folding potential with the Brieva--Rook method, and second the resulting local nucleon-target potential is folded with the He density. This double single-folding model well describes He elastic scattering from Ni and Pb targets in a wide incident-energy range from 30 MeV/nucleon to 150 MeV/nucleon with no adjustable parameter. Spin-orbit force effects on differential cross sections are found to be appreciable only at higher incident energies such as 150 MeV/nucleon. Three-nucleon breakup effects of He are investigated with the continuum discretized coupled-channels method and are found to be appreciable only at lower incident energies around 40 MeV/nucleon. Effects of knock-on exchange processes are also analyzed.

    Comments:
    11 pages, 6 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1503.06257 [pdf]
    PRC(2015)·12 citations
  2. 02

    [Submitted on 21 Mar 2015]

    The theory of the Bohr-Weisskopf effect in the hyperfine structure

    F. F. Karpeshin · M.B.Trzhaskovskaya

    For twenty years research into the anomalies in the HF spectra was going in a wrong direction by fighting the related Bohr-Weisskopf effect. As a way out, the model-independent way is proposed of estimating the nuclear radii from the hyper-fine splitting. The way is based on analogy of HFS to internal conversion coefficients, and the Bohr-Weisskopf effect - to the anomalies in the internal conversion coefficients. This makes transparent It is shown that the parameters which can be extracted from the data are the even nuclear moments of the magnetization distribution. The radii and (for the first time) are thus obtained by analysis of the experimental HFS for the H- and Li-like ions of Bi. The critical prediction of the HFS for the state is discussed. The moments may be determined in this way only if the higher QED effects are properly taken into account. Therefore, this set of the parameters form a basis of a strict QED test. Experimental prospects are discussed, aimed at retrieving data on the HFS values for a set of a few-electron configurations of the atom.

    Comments:
    13 pages
    Subjects:
    Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    1503.06260 [pdf]
    NPA(2015)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE