Direct measurement of the <sup>26</sup>Si(α, p)<sup>29</sup>P reaction for the nucleosynthesis in the X-ray bursts

ORAL

Abstract

Nuclear reactions in the αp-process, the sequence of (α, p) and (p, γ) reactions, are important for the nucleosynthesis in the X-ray bursts. The 26Si(α, p)29P reaction is one of the αp-process reactions and considered to have one of the largest effects on the light curve of the X-ray burst. However, there are not sufficient experimental data for this reaction because of the technical difficulties.



We performed a direct measurement of this reaction at the CNS RI beam separator (CRIB). The 26Si(α, p)29P reaction was measured in the high temperature region around T = 3 GK using the 4He thick gas target method. In spite of the large number of background events, an upper limit on the reaction cross section was obtained, which was about one order of magnitude smaller than that of the NON-SMOKER statistical model.



This is the first experimental evaluation of this reaction cross section by a direct measurement. Therefore, the results will be informative for determining absolute value of the cross section for high energy region and constraining the 26Si(α, p)29P reaction rate and the X-ray burst light curve model.



The analysis method and the results are discussed in this presentation.

*JSPS KAKENHI (grant No. 18K13556)

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Publication: K. Okawa, M. J. Kim, K. Y. Chae, S. Hayakawa et al., "Direct measurement of the 26Si(α,p)29P reaction at CRIB for the nucleosynthesis in the X-ray bursts", EPJ Web Conf. 275, 02009 (2023). (https://doi.org/10.1051/epjconf/202327502009)

Presenters

  • Kodai Okawa

    • Center for Nuclear Study, the University of Tokyo

Authors

  • Kodai Okawa

    • Center for Nuclear Study, the University of Tokyo

  • Minju Kim

    • Department of Physics, Sungkyunkwan University

  • Andy Chae

    • Department of Physics, Sungkyunkwan University

  • Seiya Hayakawa

    • Center for Nuclear Study, the University of Tokyo

  • Satoshi Adachi

    • CYRIC, Tohoku University
    • CYRIC, Tohoku Universty
    • Cyclotron and Radioisotope Center, Tohoku University
    • Department of Physics, Osaka University
    • Cyclotron and Rareisotope Center, Tohoku University

  • Soomi Cha

    • Center for Exotic Nuclear Studies, Institute for Basic Science (IBS)

  • Thomas Chillery

    • Center for Nuclear Study, the University of Tokyo
    • CNS, University of Tokyo, Japan

  • Ngoc Ngyen Duy

    • Department of Physics, Sungkyunkwan University

  • Tatsuya Furuno

    • Department of Physics, Osaka University
    • Department of Physics, School of Science, Osaka University
    • Depertment of Physics, Osaka University

  • Gyungmo Gu

    • Department of Physics, Sungkyunkwan University

  • Shutaro Hanai

    • Center for Nuclear Study, the University of Tokyo
    • Center for Nuclear Study, The University of Tokyo

  • Nobuaki Imai

    • Center for Nuclear Study, the University of Tokyo
    • Center for Nuclear Study, The University of Tokyo
    • CNS, University of Tokyo
    • CNS, University of Tokyo, Japan
    • Center for Nuclear Study, University of Tokyo

  • David Kahl

    • Extreme Light Infrastructure Nuclear Physics (ELI-NP)

  • Takahiro Kawabata

    • Department of Physics, Osaka University
    • Department of Physics, School of Science, Osaka University
    • Osaka University
    • Depertment of Physics, Osaka University

  • Chanhee Kim

    • Department of Physics, Sungkyunkwan University

  • Dahee Kim

    • Center for Exotic Nuclear Studies, Institute for Basic Science (IBS)

  • Sohyun Kim

    • Department of Physics, Sungkyunkwan University

  • Shigeru Kubono

    • RIKEN Nishina Center
    • Univ of Tokyo
    • RIKEN

  • Minsik Kwag

    • Department of Physics, Sungkyunkwan University
    • Center for Exotic Nuclear Studies, Institute for Basic Science (IBS)

  • Jiatai Li

    • Center for Nuclear Study, the University of Tokyo

  • Nanru Ma

    • Center for Nuclear Study, the University of Tokyo

  • Shin'ichiro Michimasa

    • CNS, The University of Tokyo
    • The University of Tokyo
    • Center for Nuclear Study, the University of Tokyo
    • Center for Nuclear Study, The University of Tokyo
    • CNS, University of Tokyo
    • CNS, University of Tokyo, Japan

  • Kosuke sakanashi

    • Department of Physics, School of Science, Osaka University
    • Department of Physics, Osaka University
    • Department of physics, Osaka University

  • Hideki Shimizu

    • Center for Nuclear Study, the University of Tokyo

  • Oana Sirbu

    • Extreme Light Infrastructure Nuclear Physics (ELI-NP)

  • Kim Uyen Ngyuen

    • Department of Physics, Sungkyunkwan University

  • Hidetoshi Yamaguchi

    • Center for Nuclear Study, the University of Tokyo
    • Center for Nuclear Study, University of Tokyo

  • Rin Yokoyama

    • CNS, The University of Tokyo
    • Center for Nuclear Study, the University of Tokyo

  • Qian Zhang

    • Center for Nuclear Study, the University of Tokyo
    • Center for Nuclear Study, University of Tokyo