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Nuclear Theory·nucl-th

Friday·April 10, 2020

11 papers—4 primary·7 cross-listed

All11Primary4Cross-lists7
  1. 01

    [Submitted on 8 Apr 2020]

    Dispersion relations applied to double-folding potentials from chiral EFT

    Victoria Durant · Pierre Capel · Achim Schwenk

    We present a determination of optical potentials using the double-folding method based on chiral effective field theory nucleon-nucleon interactions at next-to-next-to-leading order combined with dispersion relations to constrain the imaginary part. This approach is benchmarked on O--O collisions, and extended to the C--C and C--O cases. Predictions derived from these potentials are compared to data for elastic scattering at energies up to 1000 MeV, as well as for fusion at low energy. Without adjusting parameters, excellent agreement with experiment is found. In addition, we study the sensitivity of the corresponding cross sections to the nucleon-nucleon interactions and nuclear densities used.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2004.04234 [pdf]
    PRC(2020)·13 citations
  2. 02

    [Submitted on 9 Apr 2020]

    Microscopic description of fission in superheavy nuclei with the parametrization D1M of the Gogny energy density functional

    R. Rodríguez-Guzmán · Y.M. Humadi · L.M. Robledo

    The constrained Hartree-Fock-Bogoliubov approximation, based on the recent parametrization D1M of the Gogny energy density functional, is used to describe fission in 435 superheavy nuclei. The Gogny-D1M parametrization is benchmarked against available experimental data on inner and second barrier heights, excitation energies of the fission isomers and half-lives in a selected set of Pu, Cm, Cf, Fm, No, Rf, Sg, Hs and Fl nuclei. Results are also compared with those obtained with the Gogny-D1M energy density functional. A detailed study of the minimal energy fission paths is carried out for isotopic chains with atomic numbers 100 Z 126 including very neutron-rich sectors up to around 4 MeV from the two-neutron driplines. Single-particle energies, ground state deformations, pairing correlations, two-nucleon separation energies and barrier heights are also discussed. In addition to fission paths, the constrained Hartree-Fock-Bogoliubov framework provides collective masses and zero-point quantum rotational and vibrational energies. Those quantities are building blocks within the Wentzel-Kramer-Brillouin formalism employed to evaluate the systematic of the spontaneous fission half-lives t. The competition between spontaneous fission and -decay is studied, through the computation of the -decay half-lives t using a parametrization of the Viola-Seaborg formula. From the comparison with the available experimental data and the results obtained with other theoretical approaches, it is concluded that D1M represents a reasonable starting point to describe fission in heavy and superheavy nuclei.

    Comments:
    24 pages, 16 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2004.04378 [pdf]
    EPJA(2020)·41 citations
  3. 03

    [Submitted on 9 Apr 2020]

    Feeddown contributions from unstable nuclei in relativistic heavy-ion collisions

    Volodymyr Vovchenko🇺🇸 · Benjamin Dönigus🇩🇪 · Behruz Kardan🇩🇪 · Manuel Lorenz🇩🇪 · Horst Stoecker🇩🇪

    We estimate the feeddown contributions from decays of unstable and nuclei to the final yields of protons, deuterons, tritons, He, and He produced in relativistic heavy-ion collisions at GeV, using the statistical model. The feeddown contribution effects do not exceed 5% at LHC and top RHIC energies due to the large penalty factors involved, but are substantial at intermediate collision energies. We observe large feeddown contributions for tritons, He, and He at GeV, where they may account for as much as 70% of the final yield at the lower end of the collision energies considered. Sizable (%) effects for deuteron yields are observed at GeV. The results suggest that the excited nuclei feeddown cannot be neglected in the ongoing and future analysis of light nuclei production at intermediate collision energies, including HADES and CBM experiments at FAIR, NICA at JINR, RHIC beam energy scan and fixed-target programmes, and NA61/SHINE at CERN. We further show that the freeze-out curve in the - plane itself is affected significantly by the light nuclei at high baryochemical potential.

    Comments:
    8 pages, 5 figures, accepted version to appear in Physics Letters B
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2004.04411 [pdf]
    PLB(2020)·36 citations
  4. 04

    [Submitted on 9 Apr 2020]

    Chiral Magnetic Effect in Isobar Collisions from Stochastic Hydrodynamics

    Gui-Rong Liang🇨🇳 · Jinfeng Liao🇺🇸 · Shu Lin🇨🇳 · Li Yan🇨🇳 · Miao Li🇨🇳

    We study chiral magnetic effect in collisions of AuAu, RuRu and ZrZr at s = 200GeV. The axial charge evolution is modeled with stochastic hydrodynamics and geometrical quantities are calculated with Monte Carlo Glauber model. By adjusting the relaxation time of magnetic field, we find our results in good agreement with background subtracted data for AuAu collisions at the same energy. We also make prediction for RuRu and ZrZr collisions. We find a weak centrality dependence of initial chiral imbalance, which implies the centrality dependence of chiral magnetic effect signal comes mainly from those of magnetic field and volume factor. Our results also show an unexpected dependence on system size: while the system of AuAu has larger chiral imbalance and magnetic field, it turns out to have smaller signal for chiral magnetic effect due to the larger volume suppression factor.

    Comments:
    19 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2004.04440 [pdf]
    CPC(2020)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE