Level structure of 21 Mg and the 20 Na(p, γ) 21 Mg stellar reaction rate

S. Kubono, Y. Funatsu, Nobuo Ikeda, M. Yasue, T. Nomura, Y. Fuchi, H. Kawashima, S. Kato, H. Miyatake, H. Orihara, T. Kajino

Research output: Contribution to journalArticle

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Abstract

The nuclear level structure of 21 Mg has been studied by the 24 Mg( 3 He, 6 He) 21 Mg reaction at 74 MeV. Angular distributions of the three-nucleon transfer reaction ( 3 He, 6 He) are measured for the first time, and successfully analyzed with exact finite-range distorted-wave-Born-approximation calculations, giving clear transferred angular momentum assignments. More than 20 states have been identified with excitation energy and spin-parity determinations, including a possible s-wave resonance just above the proton threshold. One of the s-wave resonances assumed in the previous stellar reaction rate estimates is found to be a bound state. The stellar reaction rate of the 20 Na(p, γ) 21 Mg process is estimated using the experimental data. The results predict the ignition of the proton radiative-capture process at T = 1×10 8 K under typical nova conditions (hydrogen density, X H ρ{variant} = 5×10 5 g/cm 3 ). This temperature happens to be in agreement with the previous theoretical estimates, but the new reaction rate is a few orders of magnitude smaller than the previous predictions for T {reversed tilde equals} 2-10×10 8 K. The results also suggest that the nucleosynthesis flow of the rapid-proton process will run up to 21 Mg immediately after breakout from the hot-CNO cycle.

Original languageEnglish
Pages (from-to)153-166
Number of pages14
JournalNuclear Physics, Section A
Volume537
Issue number1-2
DOIs
Publication statusPublished - Jan 1 1992
Externally publishedYes

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reaction kinetics
protons
estimates
nuclear fusion
Born approximation
ignition
parity
angular distribution
angular momentum
cycles
thresholds
hydrogen
predictions
excitation
temperature
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Level structure of 21 Mg and the 20 Na(p, γ) 21 Mg stellar reaction rate . / Kubono, S.; Funatsu, Y.; Ikeda, Nobuo; Yasue, M.; Nomura, T.; Fuchi, Y.; Kawashima, H.; Kato, S.; Miyatake, H.; Orihara, H.; Kajino, T.

In: Nuclear Physics, Section A, Vol. 537, No. 1-2, 01.01.1992, p. 153-166.

Research output: Contribution to journalArticle

Kubono, S, Funatsu, Y, Ikeda, N, Yasue, M, Nomura, T, Fuchi, Y, Kawashima, H, Kato, S, Miyatake, H, Orihara, H & Kajino, T 1992, ' Level structure of 21 Mg and the 20 Na(p, γ) 21 Mg stellar reaction rate ', Nuclear Physics, Section A, vol. 537, no. 1-2, pp. 153-166. https://doi.org/10.1016/0375-9474(92)90162-D
Kubono, S. ; Funatsu, Y. ; Ikeda, Nobuo ; Yasue, M. ; Nomura, T. ; Fuchi, Y. ; Kawashima, H. ; Kato, S. ; Miyatake, H. ; Orihara, H. ; Kajino, T. / Level structure of 21 Mg and the 20 Na(p, γ) 21 Mg stellar reaction rate In: Nuclear Physics, Section A. 1992 ; Vol. 537, No. 1-2. pp. 153-166.
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AU - Fuchi, Y.

AU - Kawashima, H.

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