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Nuclear Theory·nucl-th

Tuesday·June 18, 2019

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 07

    [Submitted on 15 Jun 2019] (cross-list from hep-ph)

    Heavy hadron molecules in effective field theory: the emergence of exotic nuclear landscapes

    Manuel Pavon Valderrama🇨🇳

    Heavy hadron molecules were first theorized from a crude analogy with the deuteron and the nuclear forces binding it, a conjecture which was proven to be on the right track after the discovery of the . However, this analogy with nuclear physics has not been seriously exploited beyond a few calculations in the two- and three-body sectors, leaving a great number of possible theoretical consequences unexplored. Here we show that nuclear and heavy hadron effective field theories are formally identical: using a suitable notation, there is no formal difference between these two effective field theories. For this, instead of using the standard heavy superfield notation, we have written the heavy hadron interactions directly in terms of the light quark degrees of freedom. We give a few examples of how to exploit this analogy, e.g. the calculation of the two-pion exchange diagrams. Yet the most relevant application of the present idea is the conjecture of exotic nuclear landscapes, i.e. the possibility of few heavy hadron bound states with characteristics similar to those of the standard nuclei.

    Comments:
    Prepared for the special issue of "The tower of effective (field) theories and the emergence of nuclear phenomena"; 14 pages, 3 tables and 2 figures; corresponds with published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1906.06491 [pdf]
    EPJA(2020)·18 citations
  2. 08

    [Submitted on 17 Jun 2019] (cross-list from astro-ph.HE)

    Presupernova neutrino signals as potential probes of neutrino mass hierarchy

    Gang Guo🇩🇪 · Yong-Zhong Qian🇺🇸 · Alexander Heger🇦🇺

    We assess the potential of using presupernova neutrino signals at the Jiangmen Underground Neutrino Observatory (JUNO) to probe the yet-unknown neutrino mass hierarchy. Using models for stars of 12, 15, 20, and 25 solar masses, we find that if the electron antineutrino signals from such a star can be predicted precisely and the star is within ~440-880 pc, the number of events of electron antineutrino captures on protons detected within one day of its explosion allows to determine the hierarchy at the > ~95% confidence level. For determination at this level using such signals from Betelgeuse, which is at a distance of ~222 pc, the uncertainty in the predicted number of signals needs to be < ~14-30%. In view of more realistic uncertainties, we discuss and advocate a model-independent determination using both electron neutrino and antineutrino signals from Betelgeuse. This method is feasible if the cosmogenic background for neutrino-electron scattering events can be reduced by a factor of ~2.5-10 from the current estimate. Such reduction might be achieved by using coincidence of the background events, the exploration of which for JUNO is highly desirable.

    Comments:
    5 pages, 4 figures
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1906.06839 [pdf]
    PLB(2019)·14 citations
  3. 09

    [Submitted on 17 Jun 2019] (cross-list from astro-ph.HE)

    Astrophysical implications of double-layer torsional oscillations in a neutron star crust as a lasagna sandwich

    Hajime Sotani · Kei Iida · Kazuhiro Oyamatsu

    In the crust of a neutron star, global torsional oscillations could occur in two elastic layers. The outer and inner layers are composed of spherical and cylindrical nuclei and of cylindrical holes (tubes) and spherical holes (bubbles), respectively, while between these two layers, a phase of slab-like (lasagna) nuclei with vanishingly small elasticity is sandwiched. In this work, we update systematic calculations of the eigenfrequencies of the fundamental oscillations in the inner layer by newly allowing for the presence of tubes. We find that the frequencies still depend strongly on the slope parameter of the nuclear symmetry energy, , while being almost independent of the incompressibility of symmetric nuclear matter. We also find that the fundamental frequencies in the inner layer can become smaller than those in the outer layer because the tube phase has a relatively small shear modulus and at the same time dominates the inner layer in thickness. As a result, we can successfully explain not only the quasi-periodic oscillations originally discovered in the observed X-ray afterglow of the giant flare of SGR 1806--20 but also many others recently found by a Bayesian procedure.

    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1906.06999 [pdf]
    MNRAS(2019)·50 citations
  4. 10

    [Submitted on 17 Jun 2019] (cross-list from hep-ph)

    Weak production of strange baryons off the nucleon

    M. Rafi Alam🇮🇳 · I. Ruiz Simo🇪🇸

    The charged current Cabibbo-supressed associated production off the nucleon induced by anti-neutrinos is studied at low and intermediate energies. The non-resonant terms are obtained using a microscopical model based on the SU(3) chiral Lagrangian. The basic parameters of the model are , the pion decay constant, Cabibbo's angle, the proton and neutron magnetic moments and the axial vector coupling constants for the baryons octet, D and F, that are obtained from the analysis of the semileptonic decays of neutron and hyperons. In addition, we also consider resonance, which can decay in final state when this channel is open. The studied mechanism is the prime source of production at anti-neutrino energies around GeV and the calculated cross sections at these energies can be measured at the current and future neutrino experiments.

    Comments:
    10 pages, 4 figures, 3 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1906.07049 [pdf]
    PRD(2019)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE