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

Abstract

The 15N(p,gamma)16O reaction controls the passage of nucleosynthetic material from the first to the second carbon-nitrogen-oxygen (CNO) cycle. A direct measurement of the total 15N(p,gamma)16O cross section at energies corresponding to hydrogen burning in novae is presented here. Data have been taken at 90-230 keV center-of-mass energy using a windowless gas target filled with nitrogen of natural isotopic composition and a bismuth germanate summing detector. The cross section is found to be a factor two lower than previously believed.

LUNA collaboration; accepted by J. Phys. G

References in corpus (6)

• 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
• 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
• Measurement of 25Mg(p; gamma)26Al resonance strengths via gamma spectrometry

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• Constraining the S factor of 15N(p,g)16O at Astrophysical Energies
• Exploring Stars in Underground Laboratories: Challenges and Solutions
• Solar fusion III: New data and theory for hydrogen-burning stars
• Study of the neutron and proton capture reactions 10,11b(n, g), 11b(p, g), 14c(p, g), and 15n(p, g) at thermal and astrophysical energies
• Cosmic-ray induced background intercomparison with actively shielded HPGe detectors at underground locations
• Radiative proton capture on ${}^{15}\mathrm{N}$ within effective field theory