The 14N(p,gamma)15O cross section at 0.5-1.5 MeV

The 14N(p,g)15O reaction is the bottleneck of the carbon-nitrogen-oxygen (CNO) cycle, thus determining its speed. The precise knowledge of its cross section is necessary to address the recently discovered discrepancy for elemental abundances in the standard solar model, the so-called solar abundance problem. Several experimental efforts are underway to improve the precision, among them lifetime measurements of excited states in the 15O compound nucleus. The seminar talk will report on a different approach, namely a direct cross section measurement at comparatively high energy, 0.5-1.5 MeV, recently performed at the Dresden Tandetron.