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Nuclear Theory·nucl-th

Friday·April 15, 2016

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 01

    [Submitted on 14 Apr 2016]

    Polarization of massive fermions in a vortical fluid

    Ren-hong Fang🇨🇳 · Long-gang Pang🇩🇪 · Qun Wang🇨🇳 · Xin-nian Wang🇨🇳

    Fermions become polarized in a vorticular fluid due to spin-vorticity coupling. Such a polarization can be calculated from the Wigner function in a quantum kinetic approach. Extending previous results for chiral fermions, we derive the Wigner function for massive fermions up to the next-to-leading order in spatial gradient expansion. The polarization density of fermions can be calculated from the axial vector component of the Wigner function and is found to be proportional to the local vorticity . The polarizations per particle for fermions and anti-fermions decrease with the chemical potential and increase with energy (mass). Both quantities approach the asymptotic value in the large energy (mass) limit. The polarization per particle for fermions is always smaller than that for anti-fermions, whose ratio of fermions to anti-fermions also decreases with the chemical potential. The polarization per particle on the Cooper-Frye freeze-out hyper-surface can also be formulated and is consistent with the previous result of Becattini et al..

    Comments:
    RevTex 4, 12 pages, 5 figures. Discussions about the correspondence between polarization from vorticity and from magnetic field are added. The property that polarization per particle for fermions is smaller than that for anti-fermions is discussed in more detail. To appear in PRC
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1604.04036 [pdf]
    PRC(2016)·206 citations
  2. 02

    [Submitted on 14 Apr 2016]

    Tidal wave in Pd: An extended five-dimensional collective Hamiltonian description

    Y. Y. Wang🇨🇳 · Z. Shi🇨🇳 · Q. B. Chen🇨🇳 · S. Q. Zhang🇨🇳 · C. Y. Song🇨🇳

    The five-dimensional collective Hamiltonian based on the covariant density functional theory is applied to investigate the observed tidal wave mode in the yrast band of Pd. The energy spectra, the relations between the spin and the rotational frequency, and the ratios of in the yrast band are well reproduced by introducing the empirical formula for the moments of inertia. This formula is related to the fourth order effect of collective momentum in the collective Hamiltonian. It is also shown that the shape evolution in the tidal wave is determined microscopically by the competition between the rotational kinetic energy and the collective potential in the framework of the collective Hamiltonian.

    Comments:
    11 pages, 7 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1604.04132 [pdf]
    PRC(2016)·12 citations
  3. 03

    [Submitted on 14 Apr 2016]

    Understanding the shortened lifetime of \boldmath\unboldmath

    Jean-Marc Richard🇫🇷 · Qian Wang🇩🇪 · Qiang Zhao🇨🇳

    The lifetime of the hypertriton has been recently measured as significantly shorter than that of the free . We present an explanation based on a change of the intrinsic hyperon decay due to the nuclear environment.

    Comments:
    5 pages, 3 figures
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1604.04208 [pdf]
    8 citations

Affiliations

first authorsco-authorsvia INSPIRE