PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·February 6, 2019

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 01

    [Submitted on 5 Feb 2019]

    Charge symmetry violation in the determination of strangeness form factors

    Ali Alkathiri🇦🇺 · Ross D. Young🇦🇺 · James M. Zanotti🇦🇺

    The strange quark contributions to the electromagnetic form factors of the proton are ideal quantities to study the role of hidden flavor in the properties of the proton. This has motivated intense experimental measurements of these form factors. A major remaining source of systematic uncertainty in these determinations is the assumption that charge symmetry violation (CSV) is negligible. We use recent theoretical determinations of the CSV form factors and reanalyse the available parity-violating electron scattering data, up to 1 GeV. Our analysis considers systematic expansions of the strangeness electric and magnetic form factors of the proton. The results provide an update to the determination of strangeness over a range of where, under certain assumptions about the effective axial form factor, an emergence of non-zero strangeness is revealed in the vicinity of 0.6 GeV. Given the recent theoretical calculations, it is found that the current limits on CSV do not have a significant impact on the interpretation of the measurements and hence suggests an opportunity for a next generation of parity-violating measurements to more precisely map the distribution of strange quarks.

    Comments:
    9 pages, 5 figures, 4 tables
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1902.01590 [pdf]
    PRC(2020)·0 citations
  2. 02

    [Submitted on 5 Feb 2019]

    TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: a Mini Review

    Kazuyuki Sekizawa🇯🇵

    Time-dependent Hartree-Fock (TDHF) theory has been a powerful tool in describing a variety of complex nuclear dynamics microscopically without empirical parameters. In this contribution, recent advances in nuclear dynamics studies with TDHF and its extensions are briefly reviewed, along the line with the study of multinucleon transfer (MNT) reactions. The latter lies at the core of this Research Topic, whose application for production of extremely neutron-rich nuclei has been extensively discussed in recent years. Having in mind the ongoing theoretical developments, it is envisaged how microscopic theories may contribute to the future MNT study.

    Comments:
    13 pages, 1 figure; An invited mini review to be published in: Research Topic "Structure, Reaction and Production Mechanism of Extremely Neutron-Rich Nuclei" (ed.) N. Wang, A. Bonaccorso, and S.-G. Zhou, in Frontiers in Physics, section Nuclear Physics
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1902.01616 [pdf]
    Front.in Phys.(2019)·93 citations
  3. 03

    [Submitted on 5 Feb 2019]

    Resistive dissipative magnetohydrodynamics from the Boltzmann-Vlasov equation

    Gabriel S. Denicol🇧🇷 · Etele Molnár🇩🇪 · Harri Niemi🇩🇪 · Dirk H. Rischke🇩🇪

    We derive the equations of motion of relativistic, resistive, second-order dissipative magnetohydrodynamics from the Boltzmann-Vlasov equation using the method of moments. We thus extend our previous work [Phys. Rev. D 98, 076009 (2018)], where we only considered the non-resistive limit, to the case of finite electric conductivity. This requires keeping terms proportional to the electric field in the equations of motions and leads to new transport coefficients due to the coupling of the electric field to dissipative quantities. We also show that the Navier-Stokes limit of the charge-diffusion current corresponds to Ohm's law, while the coefficients of electrical conductivity and charge diffusion are related by a type of Wiedemann-Franz law.

    Comments:
    11 pages
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Fluid Dynamics (physics.flu-dyn); Plasma Physics (physics.plasm-ph)
    arXiv:
    1902.01699 [pdf]
    PRD(2019)·92 citations
  4. 04

    [Submitted on 5 Feb 2019]

    Ab Initio No Core Shell Model Study of Neutron Rich Nitrogen Isotopes

    Archana Saxena · Praveen C. Srivastava

    In the present paper, we have calculated the energy spectra for neutron rich N isotopes using no core shell model (NCSM).To calculate the energy spectrum we have used three different potentials, inside non-local outside Yukawa (INOY), next-to-next-to-next-leading order (N3LO) from chiral effective field theory and charge-dependent Bonn 2000 (CDB2K). The INOY potential, which is a two body interaction but also have the effect of three body forces by short range and non local character present in it. The calculations have been done at =20 MeV, 14 MeV and 12 MeV using INOY, N3LO and CDB2K potentials, respectively. Apart from this, we have also performed shell model calculations with the YSOX interaction.The results with INOY interaction show good agreement with the experimental data in comparison to other three interactions. We have also shown the occupancy of different orbitals involved corresponding to the largest model space (= 4) in the present calculations.

    Comments:
    6 pages, 5 figures, Accepted for publication in Progress of Theoretical and Experimental Physics (2019)
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1902.01712 [pdf]
    PTEP·12 citations
  5. 05

    [Submitted on 4 Feb 2019] (cross-list from hep-th)

    Singularity Free Direct Calculation of Spontaneous Mass Generation

    Ken-Ichi Aoki🇯🇵 · Tamao Kobayashi🇯🇵 · Shin-Ichiro Kumamoto🇯🇵 · Shinnosuke Onai🇯🇵 · Daisuke Sato🇯🇵

    We propose a new iterative method to directly calculate the spontaneous mass generation. It is regarded as a new regularization method resembling the finite volume calculation which assures non-negative fluctuation property at every stage. We work with the Nambu--Jona-Lasinio model and the strong coupling gauge theory where the dynamical chiral symmetry breaking occurs. We are able to conclude the physical mass definitely without encountering any singularity nor recourse to any additional consideration like the free energy comparison. However in special case of the 1st order phase transition, we find that the iterative method has a chance to go wrong.

    Subjects:
    High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1902.01700 [pdf]
    The Science Reports of Kanazawa Universit…·1 citation
  6. 06

    [Submitted on 5 Feb 2019] (cross-list from physics.gen-ph)

    Neutron oscillations for solving neutron lifetime and dark matter puzzles

    Wanpeng Tan🇺🇸

    A model of (neutron-mirror neutron) oscillations is proposed under the framework of the mirror matter theory with slightly broken mirror symmetry. It resolves the neutron lifetime discrepancy, i.e., the 1% difference in neutron lifetime between measurements from "beam" and "bottle" experiments. In consideration of the early universe evolution, the mass difference is determined to be about eV/c with the mixing strength of about . The picture of how the mirror-to-ordinary matter density ratio is evolved in the early universe into the observed dark-to-baryon matter density ratio of about 5.4 is presented. Reanalysis of previous data and new experiments that can be carried out under current technology are discussed and recommended to test this proposed model. Other consequences of the model on astrophysics and possible oscillations of other neutral particles are discussed as well.

    Comments:
    See arXiv:1902.03685 for application in stars, arXiv:1903.07474 for ultrahigh energy cosmic rays, arXiv:1904.03835 for baryon asymmetry, and arXiv:1906.10262 for CKM and tests
    Subjects:
    physics.gen-ph (physics.gen-ph)
    arXiv:
    1902.01837 [pdf]
    PLB(2019)·37 citations

Affiliations

first authorsco-authorsvia INSPIRE