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The 15N(p,gamma)16O reaction controls the passage of nucleosynthetic materialfrom the first to the second carbon-nitrogen-oxygen (CNO) cycle. A directmeasurement of the total 15N(p,gamma)16O cross section at energiescorresponding to hydrogen burning in novae is presented here. Data have beentaken at 90-230 keV center-of-mass energy using a windowless gas target filledwith nitrogen of natural isotopic composition and a bismuth germanate summingdetector. The cross section is found to be a factor two lower than previouslybelieved.

Direct measurement of the 15N(p,gamma)16O total cross section at novae energies