First measurement of the 14N(p,gamma)15O cross section down to 70 keV

Abstract

In stars with temperatures above 20*10^6 K, hydrogen burning is dominated by the CNO cycle. Its rate is determined by the slowest process, the 14N(p,gamma)15O reaction. Deep underground in Italy's Gran Sasso laboratory, at the LUNA 400 kV accelerator, the cross section of this reaction has been measured at energies much lower than ever achieved before. Using a windowless gas target and a 4pi BGO summing detector, direct cross section data has been obtained down to 70 keV, reaching a value of 0.24 picobarn. The Gamow peak has been covered by experimental data for several scenarios of stable and explosive hydrogen burning. In addition, the strength of the 259 keV resonance has been remeasured. The thermonuclear reaction rate has been calculated for temperatures 90 - 300 *10^6 K, for the first time with negligible impact from extrapolations.

References in corpus (10)

• Solar Fusion Cross Sections
• Nucleosynthesis in Classical Novae: ONe vs. CO White Dwarfs
• S-factor of 14N(p,gamma)15O at astrophysical energies
• The Effects of Thermonuclear Reaction Rate Variations on Nova Nucleosynthesis: A Sensitivity Study
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• Direct measurement of the 14N(p,g)15O S-factor
• Feasibility of low energy radiative capture experiments at the LUNA underground accelerator facility
• Nuclear Reaction Rates and Carbon Star Formation
• Influence of two updated nuclear reaction rates on the evolution of low and intermediate mass stars

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