The N14(p,γ)O15 reaction is the slowest reaction of the carbon-nitrogen-oxygen cycle of hydrogen burning in stars. As a consequence, it determines the rate of the cycle. The N15(p,αγ)C12 reaction is frequently used in inverse kinematics for hydrogen depth profiling in materials. The N14(p,γ)O15 and N15(p,αγ)C12 reactions have been studied simultaneously, using titanium nitride targets of natural isotopic composition and a proton beam. The strengths of the resonances at Ep=1058 keV in N14(p,γ)O15 and at Ep=897 and 430 keV in N15(p,αγ)C12 have been determined with improved precision, relative to the well-known resonance at Ep=278 keV in N14(p,γ)O15. The new recommended values are ωγ=0.353±0.018, 362±20, and 21.9±1.0 eV for their respective strengths. In addition, the branching ratios for the decay of the Ep=1058 keV resonance in N14(p,γ)O15 have been redetermined. The data reported here should facilitate future studies of off-resonant capture in the N14(p,γ)O15 reaction that are needed for an improved R-matrix extrapolation of the cross section. In addition, the data on the 430 keV resonance in N15(p,αγ)C12 may be useful for hydrogen depth profiling.
ASJC Scopus subject areas
- Nuclear and High Energy Physics