Measurement of Radiative Proton Capture on F-18 and Implications for Oxygen-Neon Novae

C. Akers*, A. M. Laird, B. R. Fulton, C. Ruiz, D. W. Bardayan, L. Buchmann, G. Christian, B. Davids, L. Erikson, J. Fallis, U. Hager, D. Hutcheon, L. Martin, A. St. J. Murphy, K. Nelson, A. Spyrou, C. Stanford, D. Ottewell, A. Rojas, Alex Murphy

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The rate of the F-18(p, gamma)Ne-19 reaction affects the final abundance of the gamma-ray observable radioisotope F-18, produced in novae. However, no successful measurement of this reaction exists and the rate used is calculated from incomplete information on the contributing resonances. Of the two resonances thought to play a significant role, one has a radiative width estimated from the assumed analogue state in the mirror nucleus, F-19. The second does not have an analogue state assignment at all, resulting in an arbitrary radiative width being assumed. Here, we report the first successful direct measurement of the F-18(p, gamma)Ne-19 reaction. The strength of the 665 keV resonance (E-x = 7.076 MeV) is found to be over an order of magnitude weaker than currently assumed in nova models. Reaction rate calculations show that this resonance therefore plays no significant role in the destruction of F-18 at any astrophysical energy.

Original languageEnglish
Article number262502
Number of pages5
JournalPhysical Review Letters
Volume110
Issue number26
DOIs
Publication statusPublished - 28 Jun 2013

Keywords

  • REACTION-RATES
  • CLASSICAL NOVAE
  • ISAC

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