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Resonances in Ne-19 with relevance to the astrophysically important F-18(p,alpha)O-15 reaction

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Published copy (DOI)

Author(s)

  • D. J. Mountford
  • A. St J. Murphy
  • N. L. Achouri
  • C. Angulo
  • J. R. Brown
  • T. Davinson
  • F. de Oliveira Santos
  • N. de Sereville
  • P. Descouvemont
  • O. Kamalou
  • A. M. Laird
  • S. T. Pittman
  • P. Ujic
  • P. J. Woods

Department/unit(s)

Publication details

JournalPhysical Review C
DatePublished - 6 Feb 2012
Issue number2
Volume85
Number of pages6
Pages (from-to)-
Original languageEnglish

Abstract

The most intense gamma-ray line observable from novae is likely to be from positron annihilation associated with the decay of F-18. The uncertainty in the destruction rate of this nucleus through the F-18(p,alpha)O-15 reaction presents a limit to interpretation of any future observed gamma-ray flux. Direct measurements of the cross section of both this reaction and the F-18(p,p)F-18 reaction have been performed between center of mass energies of 0.5 and 1.9 MeV. Simultaneous fits to both data sets with the R-matrix formalism reveal several resonances, with the inferred parameters of populated states in Ne-19 in general agreement with previous measurements. Of particular interest, extra strength has been observed above E-c.m. similar to 1.3 MeV in the F-18(p,p)F-18 reaction and between 1.3-1.7 MeV in the F-18(p,alpha)O-15 reaction. This is well described by a broad 1/2(+) state, consistent with both a recent theoretical prediction and an inelastic scattering measurement. The astrophysical implications of a broad subthreshold partner to this state are discussed.

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