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

    Fingerprint

    nuclear fusion
    supernovae
    explosions
    neutrinos
    ejecta
    neutrons
    heating
    nuclei
    simulation
    isotopes
    hydrodynamics
    magnetic fields
    energy

    ASJC Scopus subject areas

    • General

    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).

    The r-process nucleosynthesis in core-collapse supernovae with the magneto-rotational instability. / Nishimura, N.; Sawai, H.; Takiwaki, T.; Yamada, Shoichi.

    Proceedings of Science. Vol. 07-11-July-2015 Proceedings of Science (PoS), 2014. 128.

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

    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), 13th Nuclei in the Cosmos, NIC 2014, Debrecen, Hungary, 14/7/7.
    Nishimura N, Sawai H, Takiwaki T, Yamada S. The r-process nucleosynthesis in core-collapse supernovae with the magneto-rotational instability. In Proceedings of Science. Vol. 07-11-July-2015. Proceedings of Science (PoS). 2014. 128
    Nishimura, N. ; Sawai, H. ; Takiwaki, T. ; Yamada, Shoichi. / The r-process nucleosynthesis in core-collapse supernovae with the magneto-rotational instability. Proceedings of Science. Vol. 07-11-July-2015 Proceedings of Science (PoS), 2014.
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