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Nuclear Theory·nucl-th

Thursday·April 5, 2018

9 papers—4 primary·5 cross-listed

All9Primary4Cross-lists5
  1. 01

    [Submitted on 3 Apr 2018]

    Coulomb Excitation of Deuteron in Peripheral Collisions with a Heavy Ion

    Weijie Du · Peng Yin · Yang Li · Guangyao Chen · Wei Zuo · Xingbo Zhao · James P. Vary

    We develop an ab initio, non-perturbative, time-dependent Basis Function (tBF) method to solve the nuclear structure and scattering problems in a unified manner. We apply this method to a test problem: the Coulomb excitation of a trapped deuteron by an impinging heavy ion. The states of the deuteron system are obtained by the ab initio nuclear structure calculation implementing a realistic inter-nucleon interaction with a weak external trap to localize the center of mass and to discretize the continuum. The evolution of the internal state of the deuteron system is directly solved using the equation of motion for the scattering. We analyze the excitation mechanism of the deuteron system by investigating its internal transition probabilities and observables as functions of the exposure time and the incident speed. In this investigation, the dynamics of the Coulomb excitation are revealed by the time evolution of the system's internal charge distribution.

    Comments:
    28 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1804.01156 [pdf]
    PRC(2018)·16 citations
  3. 03

    [Submitted on 4 Apr 2018]

    Light clusters in warm stellar matter: explicit mass shifts and universal cluster-meson couplings

    Helena Pais🇵🇹 · Francesca Gulminelli🇫🇷 · Constança Providência🇵🇹 · Gerd Röpke🇩🇪

    In-medium modifications of light cluster properties in warm stellar matter are studied within the relativistic mean-field approximation. In-medium effects are included by introducing an explicit binding energy shift analytically calculated in the Thomas-Fermi approximation, supplemented with a phenomenological modification of the cluster couplings to the meson. A linear dependence on the meson is assumed for the cluster mass, and the associated coupling constant is fixed imposing that the virial limit at low density is recovered. The resulting cluster abundances come out to be in reasonable agreement with constraints at higher density coming from heavy ion collision data. Some comparisons with microscopic calculations are also shown.

    Comments:
    13 pages, 7 figures, 3 tables, accepted for publication in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1804.01328 [pdf]
    PRC(2018)·37 citations
  4. 04

    [Submitted on 3 Apr 2018]

    A simple approach to the chaos-order contributions in nuclear spectra

    A.G. Magner · A.I. Levon · S.V. Radionov

    The simple one-parameter nearest neighbor-spacing distribution (NNSD) is suggested for statistical analysis of nuclear spectra. This distribution is derived within the Wigner-Dyson approach in the linear approximation for the level repulsion density of quantum states. The obtained NNSD gives the individual information on the Wigner and Poisson contributions in agreement with that of the statistical experimental distributions of collective states in deformed nuclei. Using this NNSD, one finds that the symmetry breaking due to the fixing of projections of the angular momentum of collective states enhances a chaos as a shift of the NNSD from the Poisson to Wigner distribution behavior.

    Comments:
    6 pages, 3 figures. arXiv admin note: text overlap with arXiv:1711.01848
    Subjects:
    Nuclear Theory (nucl-th); nlin.CD (nlin.CD); Nuclear Experiment (nucl-ex)
    arXiv:
    1804.01433 [pdf]
    EPJA(2018)·7 citations

Affiliations

first authorsco-authorsvia INSPIRE