Break-out from the hot-CNO cycle studied with radioactive beams

A.N. Ostrowski, A.M. Laird, A.C. Shotter, M. Aliotta, F. Cappuzzello, S. Cherubini, A. Cunsolo, T. Davinson, W. Galster, J.S. Graulich, D. Groombridge, J. Hinnefeld, P. Leleux, L. Michel, S. Morrow, A. Musumarra, A. Ninane, A. Spitaleri, A. Tumino, J. Vervier

Research output: Contribution to journalArticlepeer-review

Abstract

The 15O(α,γ)19Ne reaction is generally considered as the potential breakout reaction from the hot-CNO cycle. Under nova conditions, the reaction depends dominantly on a single sub-Coulomb resonance atEc.m.=504 keV which corresponds to a 19Ne excitation energy of ER=4.033 MeV. It is possible to model the15O(α,γ)19Ne reaction rate, if the branching ratio Γα/Γ and the total resonance width Γ of this state are known. Results from an exploratory 18Ne(d,p) experiment performed in inverse kinematics at Elab=44.1 MeV and 106 pps beam intensity show that the 4.033 MeV state—among other resonances of astrophysical interest—is populated in this reaction ( at θlab=138°). The determination of Γα/Γ=0.28±0.13 for another 19Ne resonance at ER=4.600 MeV found to be in good agreement with a stable beam based result shows the feasibility of this radioactive nuclear beam based approach provided that higher 18Ne beam intensities become available.

Original languageEnglish
Pages (from-to)621-624
Number of pages4
JournalNuclear Physics A
Volume701
Issue number1-4
DOIs
Publication statusPublished - 22 Apr 2002

Keywords

  • exotic nucleus scattering
  • branching ratios
  • LOW-ENERGY RESONANCES
  • O-15(ALPHA,GAMMA)NE-19
  • N-15(ALPHA,GAMMA)F-19

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