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Nuclear Theory·nucl-th

Monday·July 20, 2020

3 papers—1 primary·2 cross-listed

All3Primary1Cross-lists2
  1. 01

    [Submitted on 17 Jul 2020]

    Critical properties of calibrated relativistic mean-field models for the transition to warm, non-homogeneous nuclear matter

    Olfa Boukari🇹🇳 · Helena Pais🇵🇹 · Sofija Antić🇦🇺 · Constança Providência🇵🇹

    The critical properties for the transition to warm, asymmetric, non-homogeneous nuclear matter are analysed within a thermodynamical spinodal approach for a set of well calibrated equations of state. It is shown that even though different equations of state are constrained by the same experimental, theoretical and observational data, and the properties of symmetric nuclear matter are similar within the models, the properties of very asymmetric nuclear matter, such as the one found inside of neutron stars, differ a lot for various models. Some models predict larger transition densities to homogeneous matter for beta-equilibrated matter than for symmetric nuclear matter. Since one expects that such properties have a noticeable impact on the the evolution of either a supernova or neutron star merger, this different behavior should be understood in more detail.

    Comments:
    13 pages, 10 figures, 4 tables; accepted for publication in PRC
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR)
    arXiv:
    2007.08852 [pdf]
    PRC(2021)·9 citations
  2. 02

    [Submitted on 16 Jul 2020] (cross-list from hep-ph)

    Coherent elastic neutrino-nucleus scattering: EFT analysis and nuclear responses

    Martin Hoferichter🇨🇭 · Javier Menéndez🇪🇸 · Achim Schwenk🇩🇪

    The cross section for coherent elastic neutrino-nucleus scattering (CENS) depends on the response of the target nucleus to the external current, in the Standard Model (SM) mediated by the exchange of a boson. This is typically subsumed into an object called the weak form factor of the nucleus. Here, we provide results for this form factor calculated using the large-scale nuclear shell model for a wide range of nuclei of relevance for current CENS experiments, including cesium, iodine, argon, fluorine, sodium, germanium, and xenon. In addition, we provide the responses needed to capture the axial-vector part of the cross section, which does not scale coherently with the number of neutrons, but may become relevant for the SM prediction of CENS on target nuclei with nonzero spin. We then generalize the formalism allowing for contributions beyond the SM. In particular, we stress that in this case, even for vector and axial-vector operators, the standard weak form factor does not apply anymore, but needs to be replaced by the appropriate combination of the underlying nuclear structure factors. We provide the corresponding expressions for vector, axial-vector, but also (pseudo-)scalar, tensor, and dipole effective operators, including two-body-current effects as predicted from chiral effective field theory. Finally, we update the spin-dependent structure factors for dark matter scattering off nuclei according to our improved treatment of the axial-vector responses.

    Comments:
    28 pages, 11 figures; journal version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2007.08529 [pdf]
    PRD(2020)·185 citations
  3. 03

    [Submitted on 17 Jul 2020] (cross-list from nucl-ex)

    Breakup mechanisms in the 6He+64Zn reaction at near-barrier energies

    J. P. Fernández-García🇪🇸 · A. Di Pietro🇮🇹 · P. Figuera🇮🇹 · J. Gómez-Camacho🇪🇸 · M. Lattuada🇮🇹 · J. Lei🇺🇸 · A. M. Moro🇪🇸 · M. Rodríguez-Gallardo🇪🇸 · V. Scuderi🇮🇹

    New experimental results for the elastic scattering of 6He on 64Zn at incident energies of 15.0 and 18.0 MeV and 4He at 17.5 MeV along with results already published at 10.0 and 13.6 MeV, are presented. Elastic and alpha experimental cross sections are compared with coupled-reaction-channel, continuum-discretized coupledchannel, and DWBA inclusive-breakup models. The large yield of alpha particles observed at all measured energies can be explained by considering a nonelastic breakup mechanism.

    Subjects:
    Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2007.09020 [pdf]
    PRC(2019)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE