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Nuclear Theory·nucl-th

Monday·June 25, 2018

8 papers—3 primary·5 cross-listed

All8Primary3Cross-lists5
  1. 01

    [Submitted on 22 Jun 2018]

    Lattice calculations for two-component fermion systems with unequal masses: one dimension

    Serdar Elhatisari🇩🇪

    We consider systems of two-component fermions with unequal masses and interacting via a short-range attractive potential. We discuss the case where the two-component fermions form a shallow dimer with large scattering length. The three-fermion and four-fermion systems with such properties are universal and charazteried by the two-fermion scattering length and the ratio of the mass of spin- fermion to the mass of spin- fermion, . In this study using lattice effective field theory we analyze fermion-dimer and dimer-dimer systems, and calculate the universal fermion-dimer and dimer-dimer scattering lengths for various values of the mass ratio . We find that these universal scattering lengths increase logarithmically with the mass ratio .

    Comments:
    11 pages, 8 figures. Submitted to Turkish Journal of Physics
    Subjects:
    Nuclear Theory (nucl-th); Quantum Gases (cond-mat.quant-gas); High Energy Physics — Lattice (hep-lat); Atomic Physics (physics.atom-ph)
    arXiv:
    1806.08591 [pdf]
    Turk.J.Phys.(2018)·0 citations
  2. 02

    [Submitted on 22 Jun 2018]

    Asymmetric Relativistic Fermi Gas model for quasielastic lepton-nucleus scattering

    M.B. Barbaro🇮🇹 · A. De Pace🇮🇹 · T.W. Donnelly🇺🇸 · J.A. Caballero🇪🇸 · G.D. Megias🇪🇸 · J.W. Van Orden🇺🇸

    We develop an asymmetric relativistic Fermi gas model for the study of the electroweak nuclear response in the quasielastic region. The model takes into account the differences between neutron and proton densities in asymmetric (N > Z) nuclei, as well as differences in the neutron and proton separation energies. We present numerical results for both neutral and charged current processes, focusing on nuclei of interest for ongoing and future neutrino oscillation experiments. We point out some important differences with respect to the commonly employed symmetric Fermi gas model.

    Comments:
    18 pages, 10 figures
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1806.08594 [pdf]
    PRC(2018)·11 citations
  3. 03

    [Submitted on 21 Jun 2018]

    Electron Capture Beta Decay of Partially Polarized Nuclei

    Rourav Basak🇺🇸 · Vladimir I. Tsifrinovich🇺🇸

    We compute the spin excess for the neutrinos radiated in the process of electron capture beta decay of partially polarized nuclei. The results of computation are presented for the Sb nuclei polarized by the strong hyperfine field in a ferromagnetic substance. This system was suggested as a possible source of directed neutrino radiation. We directly compute the spin excess of radiated neutrinos and show that it is greater than that estimated previously under simplifying assumptions.

    Comments:
    8pages,1figure
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1806.08668 [pdf]
    Mod.Phys.Lett.A(2019)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE