The 18O(p, α)15N reaction at stellar energies

Details The 18O(p, α)15N reaction at stellar energies The 18O(p, α)15N reaction at stellar energies

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979nupha.313..346l&link_type=abstract

Nuclear Physics A, Volume 313, Issue 3, p. 346-362.

Physics

Nuclear Physics

34

Nuclear Reaction

Scientific paper

The 18O(p, α)15N reaction has been investigated in the energy range Ep = 72-935 keV. The three known resonances above Ep = 620 keV have been confirmed and four new resonances have been found below Ep = 340 keV. All observed resonances correspond to known compound states in 19F. Information on resonance energies, total widths and ωγ values is reported. The low-energy resonances are superimposed on a non-resonant reaction yield, which varies smoothly with beam energy and which exhibits pronounced α-particle angular distributions asymmetric around 90°. The explanation of these data requires either interferring amplitudes of broad resonances with differing parities or a direct (p, α) reaction mechanism. The investigated energy range corresponds to the important temperature range of T = (0.05-2.5) × 109 K. The energy averaged astrophysical reaction rates are compared with predictions.

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