Direct Measurement of $^{21}$Na+$\alpha$ Stellar Reaction

ORAL

Abstract

Nucleosynthesis of $^{22}$Na is an interesting subject because of possible $\gamma$-ray observation and isotopic anomalies in presolar grain. $^{22}$Na would have been mainly produced in the NeNa cycle. At high temperature conditions, $^{21}$Na($\alpha$,p)$^{24}$Mg reaction could play a significant role to make flow from the NeNa cycle to the next MgAl cycle and beyond. Clearly, the $^{21}$Na($\alpha$,p)$^{24}$Mg stellar reaction would bypass $^{22}$Na, resulting in reduction of $^{22}$Na production, therefore, it is strongly coupled to the Ne-E problem. It could be also important to understand the early stage of the rp-process. Experiment was performed using a 39~MeV $^{21}$Na radioactive beam obtained by the CNS Radio Isotope Beam separator CRIB of the University of Tokyo. Both protons and alphas were measured from $\alpha$+$^{21}$Na scattering with a thick $^4$He gas target.

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Authors

  • Nguyen Binh Dam

    • Center for Nuclear Study, University of Tokyo

  • Hidetoshi Yamaguchi

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

  • Y. Wakabayashi

    • Center for Nuclear Study, University of Tokyo

  • S. Hayakawa

    • Center for Nuclear Study, University of Tokyo

  • T. Hashimoto

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

  • D. Kahl

    • Center for Nuclear Study, University of Tokyo

  • Shigeru Kubono

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

  • H.K. Le

    • Institute of Physics, Vietnamese Academy for Science and Technology

  • T.T. Nguyen

    • Institute of Physics, Vietnamese Academy for Science and Technology

  • N. Iwasa

    • Department of Physics, Tohoku University

  • N. Kume

    • Department of Physics, Tohoku University

  • S. Kato

    • Department of Physics, Yamagata University

  • T. Teranishi

    • Department of Physics, Kuyshu University