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Nuclear Theory·nucl-th

Monday·July 11, 2016

7 papers—2 primary·5 cross-listed

All7Primary2Cross-lists5
  1. 01

    [Submitted on 7 Jul 2016]

    Nuclear Zemach Moments and Finite-Size Corrections to Allowed Beta Decay

    X.B. Wang · J.L. Friar · A.C. Hayes

    The finite-size correction to -decay plays an important role in determining the expected antineutrino spectra from reactors at a level that is important for the reactor-neutrino anomaly. Here we express the leading-order finite-size correction to allowed -decay in terms of Zemach moments. We calculate the Zemach moments within a Hartree-Fock model using a Skyrme-like energy density functional. We find that the Zemach moments are increased relative to predictions based on the simple assumption of identical uniform nuclear-charge and weak-transition densities. However, for allowed ground-state to ground-state transitions in medium and heavy nuclei, the detailed nuclear structure calculations do not change the finite-size corrections significantly from the simple model predictions, and are only 10-15% larger than the latter even though the densities differ significantly.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1607.02149 [pdf]
    PRC(2016)·26 citations
  2. 02

    [Submitted on 8 Jul 2016]

    Production of light nuclei in the thermal and coalescence models

    Stanislaw Mrowczynski🇵🇱

    The thermal model properly describes the production yields of light nuclei in relativistic heavy-ion collisions even so the loosely bound sizable nuclei cannot exist in the dense and hot hadron gas at a chemical freeze-out. Within the coalescence model, light nuclei are formed at the latest stage of nuclear collisions - a kinetic freeze-out - due to final state interactions. After discussing the models, we derive simple analytic formulas and, using model parameters directly inferred from experimental data, we show that the thermal and coalescence model predictions are quantitatively close to each other. A possibility to falsify one of the two models is suggested.

    Comments:
    6 pages, comments added, critical experimental test suggested
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1607.02267 [pdf]
    Acta Phys.Polon.B(2017)·74 citations

Affiliations

first authorsco-authorsvia INSPIRE