The r-process nucleosynthesis in core-collapse supernovae with the magneto-rotational instability

N. Nishimura, H. Sawai, T. Takiwaki, Shoichi Yamada

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    We investigate the r-process nucleosynthesis in the ejecta of core-collapse supernovae driven by rotation and magnetic fields. We adopt an explosion model based on axi-symmetric magneto- hydrodynamical simulation with the effects of magneto-rotational instability, which has been mostly ignored in previous studies. The hydrodynamics simulation also employs a very simplified treatment of neutrino transport on explosion dynamics, which includes the increase of explosion energy due to neutrino heating. We found that very neutron-rich matter in the jet-like explosion, producing heavy r-process nuclei, is ejected along the rotational axis driven by strong magnetic pressure. On the other hand, moderate neutron-rich matter is also ejected in the direction of the equatorial plane due to neutrino-heating associated with the magneto-rotational instability. This ejecta produces lighter and intermediate r-process nuclei rather than heavy isotopes A > 130. We compare these results with observed r-process abundances pattern.

    Original languageEnglish
    Title of host publicationProceedings of Science
    PublisherProceedings of Science (PoS)
    Volume07-11-July-2015
    Publication statusPublished - 2014
    Event13th Nuclei in the Cosmos, NIC 2014 - Debrecen, Hungary
    Duration: 2014 Jul 72014 Jul 11

    Other

    Other13th Nuclei in the Cosmos, NIC 2014
    CountryHungary
    CityDebrecen
    Period14/7/714/7/11

    ASJC Scopus subject areas

    • General

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  • Cite this

    Nishimura, N., Sawai, H., Takiwaki, T., & Yamada, S. (2014). The r-process nucleosynthesis in core-collapse supernovae with the magneto-rotational instability. In Proceedings of Science (Vol. 07-11-July-2015). [128] Proceedings of Science (PoS).