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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.

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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