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Nuclear Theory·nucl-th

Thursday·August 3, 2017

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 05

    Bulk Viscosity of Quark-Gluon Plasma in Strong Magnetic Fields

    Koichi Hattori🇨🇳 · Xu-Guang Huang🇨🇳 · Dirk H. Rischke🇩🇪 · Daisuke Satow🇩🇪

    We investigate the viscosities of the quark-gluon plasma in strong magnetic fields within the leading-log and lowest Landau level (LLL) approximations. We first show that the bulk viscosity in the direction parallel to the magnetic field is the only component that has a contribution from the quarks occupying the LLL. We then compute the bulk viscosity from the Kubo formula and find an intriguing quark-mass dependence as a consequence of a competition between the suppression of the bulk viscosity by conformal symmetry and an enhancement of the mean-free path by chirality conservation, which governs the behavior in the massless limit. The quark contribution to the viscosity along the magnetic field becomes larger than the one in the absence of a magnetic field. We also briefly estimate the other transport coefficients by considering the contribution of gluons. We show that the shear viscosities are suppressed compared to their values in the absence of a magnetic field.

    ↳ hep-phnucl-thPRD(2017)·89 citations
  2. 06

    High-precision -value measurement of the superallowed emitter Mg and an evaluation of the isobaric triplet

    M.P. Reiter🇨🇦 · K.G. Leach🇺🇸 · O. M. Drozdowski🇨🇦 · S.R. Stroberg🇨🇦 · J.D. Holt🇨🇦 · C. Andreoiu🇨🇦 · C. Babcock🇨🇦 · B. Barquest🇨🇦 · M. Brodeur🇺🇸 · A. Finlay🇨🇦 · M. Foster🇬🇧 · A.T. Gallant🇨🇦 and 13 other authors

    A direct -value measurement of the superallowed emitter Mg was performed using TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). The direct ground-state to ground-state atomic mass difference between Mg and Na was determined to be ~keV, representing the most precise single measurement of this quantity to date. In a continued push towards calculating superallowed isospin-symmetry-breaking (ISB) corrections from first principles, ab-initio shell-model calculations of the IMME are also presented for the first time using the valence-space in-medium similarity renormalization group formalism. With particular starting two- and three-nucleon forces, this approach demonstrates a level of agreement with the experimental data that suggests reliable ab-initio calculations of superallowed ISB corrections are now possible.

    ↳ nucl-exnucl-thPRC(2017)·13 citations
  3. 07

    Lambda beta-decay in-medium

    P.A.M. Guichon🇫🇷 · A.W. Thomas🇦🇺

    Under the working hypothesis that the structure of a bound hadron is modified by its interactions with other hadrons, one may expect to see changes in carefully chosen observables. In the light of a recent proposal to measure the axial charge in the strangeness changing beta-decay of a bound Lambda hyperon, we examine the size of the change expected within the quark-meson coupling model. It is predicted to be significant.

    ↳ hep-phnucl-thPLB(2017)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE