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Nuclear Theory·nucl-th

Friday·January 20, 2017

6 papers—5 primary·1 cross-listed

All6Primary5Cross-lists1
  1. 01

    [Submitted on 19 Jan 2017]

    Calculation of Relativistic Nucleon-Nucleon Potentials in Three-Dimensions

    M. R. Hadizadeh · M. Radin

    In this paper, we have applied a three-dimensional approach for calculation of the relativistic nucleon-nucleon potential. The quadratic operator relation between the non-relativistic and the relativistic nucleon-nucleon interactions is formulated as a function of relative two-nucleon momentum vectors, which leads to a three-dimensional integral equation. The integral equation is solved by the iteration method, and the matrix elements of the relativistic potential are calculated from non-relativistic ones. Spin-independent Malfliet-Tjon potential is employed in the numerical calculations, and the numerical tests indicate that the two-nucleon observables calculated by the relativistic potential are preserved with high accuracy.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1701.05279 [pdf]
    EPJA(2017)·9 citations
  2. 02

    [Submitted on 19 Jan 2017]

    Impact of the ionization of the atomic shell on the lifetime of the Th isomer

    F. F. Karpeshin · M.B.Trzhaskovskaya · L.F.Vitushkin

    Contemporary data are analyzed concerning the half-lives of the Th isomer in neutral atoms and various ions. It is explicitly shown that the isomer lifetime may strongly depend on the plain environmental physical conditions like pressure and temperature. Calculation is performed on the united platform of interplay of traditional and subthreshold resonance conversion. General agreement with experiment is obtained in the cases of Th and Th, a prediction is made concerning Th. Disagreement with the experiment in the case of Th may be a consequence of a random very sharp resonance with an electronic level. Account of the influence of the environment on the decay rate helps one to loose the resonance condition, which may lead to agreement with experiment. This will mean the first experimental observation of strong dependence of the nuclear decay rate on the environment.

    Comments:
    10 pages
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1701.05340 [pdf]
  3. 03

    [Submitted on 19 Jan 2017]

    Superscaling analysis of quasielastic electron scattering with relativistic effective mass

    J.E. Amaro · E. Ruiz Arriola · I. Ruiz Simo

    We provide a parametrization of a new phenomenological scaling function obtained from a chi-square fit to a selected set of (e,e') cross section data expanding a band centered around the quasielastic peak. We start from a re-analysis of quasielastic electron scattering from nuclear matter within the relativistic mean field model. The cross section depends on the relativistic effective mass of the nucleon, , and it scales with respect to a new scaling variable, . This suggests a new superscaling approach with effective mass (SuSAM*) for predicting quasielastic cross sections within an uncertainty band. The model reproduces previously established results on the enhancement of the transverse response function as compared to the traditional relativistic Fermi gas.

    Comments:
    13 pages, 13 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1701.05417 [pdf]
    PRD(2017)·15 citations
  4. 04

    [Submitted on 29 Dec 2016]

    Baryon-to-pion ratios within generic (non)extensive statistics

    Abdel Nasser Tawfik (Egyptian Ctr. Theor. Phys., Cairo, WLCAPP, Cairo)🇪🇬

    The successive stages of a high-energy collision are conjectured to end up with chemical and thermal freezeout of the produced particles. We utilize generic (non)extensive statistics which is believed to determine the degree of (non)extensivity through two critical exponents due to possible phase-space modifications. This statistical approach likely manifests various types of correlations and fluctuations and also possible interactions among the final-state produced particles. We study the baryon-to-pion ratios at top RHIC and LHC energies including the so-called proton anomaly.

    Comments:
    4 pages, 1 figure, 1 table, presented at ICHEP2016, Chicago-USA, 3-10 August 2016
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1701.05423 [pdf]
    PoS(2017)·3 citations
  5. 05

    [Submitted on 19 Jan 2017]

    Nuclear energy density functional and the nuclear alpha decay

    Yeunhwan Lim · Yongseok Oh

    The nuclear decay of heavy nuclei is investigated based on the nuclear energy density functional, which leads to the potential inside the parent nucleus in terms of the proton and neutron density profiles of the daughter nucleus. We use the Skyrme force model, Gogny force model, and relativistic mean field model to get the nucleon density profiles inside heavy nuclei. Once the nucleon density profiles are determined, the parameters of the nuclear potential are fitted to the observed decay half-lives of heavy nuclei. This approach is then applied to predict unknown decay half-lives of heavy nuclei. To estimate the values of unobserved decays, we make use of the liquid droplet model.

    Comments:
    10 pages, REVTeX, revised version
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1701.05491 [pdf]
    PRC(2017)·4 citations

Affiliations

first authorsco-authorsvia INSPIRE