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Nuclear Theory·nucl-th

Friday·October 9, 2015

7 papers—5 primary·2 cross-listed

All7Primary5Cross-lists2
  1. 01

    [Submitted on 7 Oct 2015]

    Global description of beta-minus decay in even-even nuclei with the axially-deformed Skyrme finite amplitude method

    M.T. Mustonen · J. Engel

    We use the finite amplitude method for computing charge-changing Skyrme-QRPA transition strengths in axially-deformed nuclei together with a modern Skyrme energy-density functional to fit several previously unconstrained parameters in the charge-changing time-odd part of the functional. With the modified functional we then calculate rates of beta-minus decay for all medium-mass and heavy even-even nuclei between the valley of stability and the neutron drip line. We fit the Skyrme parameters to a limited set of beta-decay rates, a set of Gamow-Teller resonance energies, and a set of spin-dipole resonance energies, in both spherical and deformed nuclei. Comparison to available experimental beta-decay rates shows agreement at roughly the same level as in other global QRPA calculations. We estimate the uncertainty in our rates all the way to the neutron drip line through a construction that extrapolates the errors of known beta-decay rates in nuclei with intermediate Q values to less stable isotopes with higher Q values.

    Comments:
    11 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.02136 [pdf]
    PRC(2016)·105 citations
  2. 02

    [Submitted on 8 Oct 2015]

    Interaction of the vector-meson octet with the baryon octet in effective field theory

    Y. Unal🇩🇪 · A. Kucukarslan🇹🇷 · S. Scherer🇩🇪

    We analyze the constraint structure of the interaction of vector mesons with baryons using the classical Dirac constraint analysis. We show that the standard interaction in terms of two independent SU(3) structures is consistent at the classical level. We then require the self-consistency condition of the interacting system in terms of perturbative renormalizability to obtain relations for the renormalized coupling constants at the one-loop level. As a result we find a universal interaction with one coupling constant which is the same as in the massive Yang-Mills Lagrangian of the vector-meson sector.

    Comments:
    18 pages, 1 figure
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1510.02205 [pdf]
    PRC(2015)·9 citations
  3. 03

    [Submitted on 8 Oct 2015]

    Is the isoscalar monopole resonance of the -particle a collective mode?

    G. Orlandini · S. Bacca · N. Barnea · W. Leidemann

    In this contribution we review and clarify the arguments which might allow the interpretation of the isoscalar monopole resonance of He as a collective breathing mode.

    Comments:
    5 pages, 3 figures, Proceedings of the 21st international conference on Few-Body Problems in Physics, May 18-22,2015, Chicago (USA)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1510.02248 [pdf]
    EPJ Web Conf.(2016)·0 citations
  4. 04

    [Submitted on 8 Oct 2015]

    Search for Long-Range Correlations in Relativistic Heavy-Ion Collisions at SPS Energies

    Shakeel Ahmad🇮🇳 · Anisa Khatun🇮🇳 · Shaista Khan🇮🇳 · A. Ahmad🇮🇳 · M. Irfan🇮🇳

    Long range correlations are searched for by analyzing the experimental data on 16O-AgBr and 32S-AgBr collisions at 200A GeV/c and the results are compared with the predictions of a multi phase transport (AMPT) model. The findings reveal that the observed forward-backward (F-B) multiplicity correlations are mainly of short-range in nature. The range of F-B correlations are observed to extend with increasing projectile mass. The observed extended range of F-B correlations might be due to overall multiplicity fluctuations arising because of nuclear geometry. The findings are not sufficient for making any definite conclusions regarding the presence of long-range correlations.

    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1510.02271 [pdf]
    Adv.High Energy Phys.(2015)·4 citations
  5. 05

    [Submitted on 8 Oct 2015]

    Effective field theory for nuclear vibrations with quantified uncertainties

    E. A. Coello Pérez · T. Papenbrock

    We develop an effective field theory (EFT) for nuclear vibrations. The key ingredients - quadrupole degrees of freedom, rotational invariance, and a breakdown scale around the three-phonon level - are taken from data. The EFT is developed for spectra and electromagnetic moments and transitions. We employ tools from Bayesian statistics for the quantification of theoretical uncertainties. The EFT consistently describes spectra and electromagnetic transitions for Ni, Ru, Pd, Cd, and Te within the theoretical uncertainties. This suggests that these nuclei can be viewed as anharmonic vibrators.

    Comments:
    20 pages
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1510.02401 [pdf]
    PRC(2015)·57 citations

Affiliations

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