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

Abstract

The rate of the carbon-nitrogen-oxygen (CNO) cycle of hydrogen burning is controlled by the 14N(p,gamma)15O reaction. The reaction proceeds by capture to the ground states and several excited states in O-15. In order to obtain a reliable extrapolation of the excitation curve to astrophysical energy, fits in the R-matrix framework are needed. In an energy range that sensitively tests such fits, new cross section data are reported here for the four major transitions in the 14N(p,gamma)15O reaction. The experiment has been performed at the Laboratory for Underground Nuclear Astrophysics (LUNA) 400 kV accelerator placed deep underground in the Gran Sasso facility in Italy. Using a composite germanium detector, summing corrections have been considerably reduced with respect to previous studies. The cross sections for capture to the ground state and to the 5181, 6172, and 6792 keV excited states in O-15 have been determined at 359, 380, and 399 keV beam energy. In addition, the branching ratios for the decay of the 278 keV resonance have been remeasured.

Submitted to Phys. Rev. C

References in corpus (10)

• Activation measurement of the 3He(alpha,gamma)7Be cross section at low energy
• First measurement of the 14N(p,gamma)15O cross section down to 70 keV
• LUNA: Nuclear Astrophysics Deep Underground
• CN-Cycle Solar Neutrinos and Sun's Primordial Core Metalicity
• Precision study of ground state capture in the 14N(p,gamma)15O reaction
• Ultra-sensitive in-beam gamma-ray spectroscopy for nuclear astrophysics at LUNA
• Feasibility of low energy radiative capture experiments at the LUNA underground accelerator facility
• Direct measurement of the 15N(p,gamma)16O total cross section at novae energies
• An actively vetoed Clover gamma-detector for nuclear astrophysics at LUNA
• Lifetime measurement of the 6792 keV state in 15O, important for the astrophysical S factor extrapolation in 14N(p,g)15O

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