The 'missing'3+state ofNe18and explosiveF17(p, γ)burning
| Autor: | K. I. Hahn, N. P. T. Bateman, M. S. Smith, Eric Adelberger, A. García, P. D. Parker, K. B. Swartz, D. M. Markoff, P. V. Magnus |
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| Rok vydání: | 1991 |
| Předmět: | |
| Zdroj: | Physical Review C. 43:2012-2019 |
| ISSN: | 1089-490X 0556-2813 |
| Popis: | Wiescher, G\"orres, and Thielemann suggested that a "missing" ${J}^{\ensuremath{\pi}}={3}^{+}$ level in $^{18}\mathrm{Ne}$ should occur at ${E}_{x}\ensuremath{\approx}4.33$ MeV, only \ensuremath{\approx}410 keV above the $^{17}\mathrm{F}$+$p$ threshold. They noted that this level would provide an $s$-wave resonance in the $^{17}\mathrm{F}(p, \ensuremath{\gamma})$ reaction, greatly increasing its thermonuclear reaction rate. This, in turn, would have a pronounced effect on the production of $^{17}\mathrm{O}$ and $^{18}\mathrm{O}$ in explosive stellar environments. We have searched for this level using the $^{16}\mathrm{O}(^{3}\mathrm{He}, n)$ reaction. High-resolution time-of-flight spectra show that the ${3}^{+}$ level occurs at ${E}_{x}=4.561\ifmmode\pm\else\textpm\fi{}0.009$ MeV, \ensuremath{\approx}230 keV higher than suggested. The astrophysical consequences of this result are discussed. |
| Databáze: | OpenAIRE |
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