Physics – Nuclear Physics
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974nupha.235..450r&link_type=abstract
Nuclear Physics A, Volume 235, Issue 2, p. 450-459.
Physics
Nuclear Physics
33
Nuclear Reactions
Scientific paper
Excitation functions of the 15N(p, γ)16O proton capture reaction have been obtained at θγ = 45° and Ep = 150-2500 keV. Below Ep = 400 keV, the reaction is dominated by capture into the ground state of 16O. The observed excitation function for the latter process can be explained if, in addition to the two well-known Jπ = 1- resonances at Ep = 338 and 1028 keV, a direct radiative capture process (DC --> 0) is included in the analysis. The direct capture component in the capture reaction is enhanced through interference effects on the tails of the two resonances. From the observed direct capture cross section, a single-particle spectroscopic factor of C2S(1p) = 1.8 +/- 0.4 has been deduced for the ground state in 16O. The extrapolated astrophysical S-factor of S(0) = 64 +/- 6 keV . b for the 15N(p, γ0)16O reaction is a factor of 2.5 larger than previously reported. This result amplifies the role of the oxygen side cycle in the CNO hydrogen burning process.
The observed excitation function of the 15N(p, α1γ1)12C reaction at Ep = 150 - 2500 keV shows that this reaction makes a negligible contribution to hydrogen burning at stellar energies [S(0) ~ 0.1 keV . b] compared to 15N(p, γ0)16O and 15N(p, αo)12C.
On leave from the National Science Foundation, Washington, DC.
Rodney W. S.
Rolfs Claus
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