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Nuclear Theory·nucl-th

Monday·September 4, 2017

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    [Submitted on 31 Aug 2017]

    seniority changing transitions in yrast states and B(E3) systematics of Sn isotopes

    Bhoomika Maheshwari · Swati Garg · Ashok Kumar Jain

    We show for the first time that the generalized seniority scheme explains reasonably well the systematics for the transitions in the Sn-isotopes, which are odd-tensor transitions connecting different seniority states (). Additionally, we also present Large Scale Shell Model (LSSM) calculations to support our interpretation. The generalized seniority scheme points to the octupole character of these states in Sn isotopes.

    Comments:
    Accepted in Pramana-Journal of Physics. arXiv admin note: substantial text overlap with arXiv:1601.07651
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1709.00004 [pdf]
    Pramana(2017)·3 citations
  2. 02

    [Submitted on 1 Sept 2017]

    EoS constraints from nuclear masses and radii in a meta-modeling approach

    D. Chatterjee🇫🇷 · F. Gulminelli🇫🇷 · Ad. R. Raduta🇷🇴 · J. Margueron🇺🇸

    The question of correlations among empirical equation of state (EoS) parameters constrained by nuclear observables is addressed in a fully empirical meta-modeling approach. A recently proposed meta-modeling for the nuclear EoS in nuclear matter, is augmented with a single finite size term to produce a minimal unified EoS functional able to describe the smooth part of the nuclear ground state properties. This meta-model can reproduce the predictions of a large variety of models, and interpolate continuously between them. The parameter space is sampled and filtered through the constraint of nuclear mass reproduction. We show that this simple analytical meta-modeling has a predictive power on masses, radii, and skins comparable to full HF or ETF calculations with realistic energy functionals. The covariance analysis on the posterior distribution shows that no physical correlation is present between the different EoS parameters. Concerning nuclear observables, a strong correlation between the slope of the symmetry energy and the neutron skin is observed, in agreement with previous studies.

    Comments:
    14 pages, 17 figures, submitted to Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1709.00189 [pdf]
    PRC(2017)·30 citations
  3. 03

    [Submitted on 1 Sept 2017]

    Systematic errors in transport calculations of shear viscosity using the Green-Kubo formalism

    J.-B. Rose · J. M. Torres-Rincon · D. Oliinychenko · A. Schäfer · H. Petersen

    The purpose of this study is to provide a reproducible framework in the use of the Green-Kubo formalism to extract transport coefficients. More specifically, in the case of shear viscosity, we investigate the limitations and technical details of fitting the auto-correlation function to a decaying exponential. This fitting procedure is found to be applicable for systems interacting both through constant and energy-dependent cross-sections, although this is only true for sufficiently dilute systems in the latter case. We find that the optimal fit technique consists in simultaneously fixing the intercept of the correlation function and use a fitting interval constrained by the relative error on the correlation function. The formalism is then applied to the full hadron gas, for which we obtain the shear viscosity to entropy ratio.

    Comments:
    5 pages, 6 figures, to be published in Open Access Journal of Physics: Conference Series (JPCS)
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1709.00369 [pdf]
    J.Phys.Conf.Ser.(2018)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE