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Nuclear Theory·nucl-th

Monday·April 5, 2021

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    [Submitted on 2 Apr 2021]

    Dynamical evolution of magnetic field in the pre-equilibrium quark-gluon plasma

    Li Yan🇨🇳 · Xu-Guang Huang🇨🇳

    High-energy heavy-ion collisions generate extremely strong magnetic field which plays a key role in a number of novel quantum phenomena in quark-gluon plasma (QGP), such as the chiral magnetic effect (CME). However, due to the complexity in theoretical modellings of the coupled electromagnetic fields and the QGP system, especially in the pre-equilibrium stages, the lifetime of the magnetic field in the QGP medium remains undetermined. We establish, for the first time, a kinetic framework to study the dynamical decay of the magnetic field in the early stages of a weakly coupled QGP by solving the coupled Boltzmann and Maxwell equations. We find that at late times a magnetohydrodynamical description of the coupled system emerges. With respect to realistic collisions at RHIC and the LHC, we estimate the residual strength of the magnetic field in the QGP when the system start to evolve hydrodynamically.

    Comments:
    6 pages and 3 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    2104.00831 [pdf]
    PRD(2023)·65 citations
  2. 02

    [Submitted on 2 Apr 2021]

    Influence of non-statistical properties in nuclear structure on emission of prompt fission neutrons

    Toshihiko Kawano🇺🇸 · Shin Okumura🇦🇹 · Amy E. Lovell🇺🇸 · Ionel Stetcu🇺🇸 · Patrick Talou🇺🇸

    The Hauser-Feshbach Fission Fragment Decay (HFD) model is extended to calculate the prompt fission neutron spectrum (PFNS) for the thermal neutron induced fission on U, where the evaporated neutrons from all possible fission fragment pairs are aggregated. By studying model parameter sensitivities on the calculated PFNS, as well as non-statistical behavior of low-lying discrete level spin distribution, we conclude that discrepancies between the aggregation calculation and the experimental PFNS seen at higher neutron emission energies can be attributed to both the primary fission fragment yield distribution and the possible high spin states that are not predicted by the statistical theory of nuclear structure.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    2104.00879 [pdf]
    PRC(2021)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE