Abstract
The 15N(p,γ)16O reaction controls the passage of nucleosynthetic material from the first to the second carbon-nitrogen-oxygen (CNO) cycle. A direct measurement of the total 15N(p,γ)16O cross section at energies corresponding to hydrogen burning in novae is presented here. Data have been taken at 90–230 keV center-of-mass energy using a windowless gas target filled with nitrogen of natural isotopic composition and a bismuth germanate summing detector. The cross section is found to be a factor 2 lower than previously believed.
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