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The rate of the carbon-nitrogen-oxygen (CNO) cycle of hydrogen burning iscontrolled by the 14N(p,gamma)15O reaction. The reaction proceeds by capture tothe ground states and several excited states in O-15. In order to obtain areliable extrapolation of the excitation curve to astrophysical energy, fits inthe R-matrix framework are needed. In an energy range that sensitively testssuch fits, new cross section data are reported here for the four majortransitions in the 14N(p,gamma)15O reaction. The experiment has been performedat the Laboratory for Underground Nuclear Astrophysics (LUNA) 400 kVaccelerator placed deep underground in the Gran Sasso facility in Italy. Usinga composite germanium detector, summing corrections have been considerablyreduced with respect to previous studies. The cross sections for capture to theground state and to the 5181, 6172, and 6792 keV excited states in O-15 havebeen determined at 359, 380, and 399 keV beam energy. In addition, thebranching ratios for the decay of the 278 keV resonance have been remeasured.

The 14N(p,gamma)15O reaction studied with a composite germanium detector