A review of r-process nucleosynthesis in the collapsar JET

Ko Nakamura, Toshitaka Kajino, Grant J. Mathews, Susumu Sato, Seiji Harikae

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    15 Citations (Scopus)

    Abstract

    The collapsar scenario for long-duration gamma ray bursts (GRBs) has been proposed as a possible astrophysical site for r-process nucleosynthesis. We summarize the status of r-process nucleosynthesis calculations of our group and others in the context of a magnetohydrodynamics + neutrino-heated collapsar model. In the simulations of our group, we begin with a relativistic magnetohydrodynamic model including ray-tracing neutrino transport to describe the development of the black hole accretion disk and the neutrino heating of the funnel region above the black hole. The late-time evolution of the associated jet was then followed using axisymmetric special relativistic hydrodynamics. We utilized representative test particles to follow the temperature, entropy, electron fraction and density for material flowing within the jet from ejection from the accretion disk until several thousand kilometer above the black hole as temperatures fall from 9×109 to 3×108 K. The evolution of nuclear abundances from nucleons to heavy nuclei for ejected test particle trajectories has been solved in a large nuclear reaction network. It was found that an r-process-like abundance distribution forms in material ejected in the collapsar jet.

    Original languageEnglish
    Article number1330022
    JournalInternational Journal of Modern Physics E
    Volume22
    Issue number10
    DOIs
    Publication statusPublished - 2013 Oct

    Keywords

    • abundances
    • Nuclear reactions
    • nucleosynthesis

    ASJC Scopus subject areas

    • Physics and Astronomy(all)
    • Nuclear and High Energy Physics

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    Nakamura, K., Kajino, T., Mathews, G. J., Sato, S., & Harikae, S. (2013). A review of r-process nucleosynthesis in the collapsar JET. International Journal of Modern Physics E, 22(10), [1330022]. https://doi.org/10.1142/S0218301313300221