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Nuclear Theory·nucl-th

Wednesday·August 26, 2020

9 papers—2 primary·7 cross-listed

All9Primary2Cross-lists7
  1. 01

    [Submitted on 25 Aug 2020]

    Dissipative Spin Dynamics in Relativistic Matter

    Samapan Bhadury🇮🇳 · Wojciech Florkowski🇵🇱 · Amaresh Jaiswal🇮🇳 · Avdhesh Kumar🇮🇳 · Radoslaw Ryblewski🇵🇱

    Using classical description of spin degrees of freedom, we extend recent formulation of the perfect-fluid hydrodynamics for spin-polarized fluids to the case including dissipation. Our work is based on the analysis of classical kinetic equations for massive particles with spin-1/2, with the collision terms treated in the relaxation time approximation. The kinetic-theory framework determines the structure of viscous and diffusive terms and allows to explicitly calculate a complete set of new kinetic coefficients that characterize dissipative spin dynamics.

    Comments:
    27 pages
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
    arXiv:
    2008.10976 [pdf]
    PRD(2021)·126 citations
  2. 02

    [Submitted on 25 Aug 2020]

    Study of three-neutron bound and continuum states

    Souichi Ishikawa

    The three-neutron () system is studied by numerical calculations with the Faddeev three-body formalism for a realistic nucleon-nucleon (NN) potential. A response function for the transition from to continuum states by an isospin excitation operator is calculated, from which no evidence of resonance state is found. Different methods to extrapolate the energy from bound state energies with an extra attractive effect to the NN potential are examined. While extrapolations with attractive effects by enhanced NN potentials or three-body potentials result the non-existence of resonance states, one by external trapping potentials leads to a positive energy, which may be considered as a resonance state. It is found that this contradiction is due to a general defect of the trapping method.

    Comments:
    6 pages, 8 figures, to appear in Phys. Rev. C
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2008.10980 [pdf]
    PRC(2020)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE