Direct measurement of the 15N(p,gamma)16O total cross section at novae energies
D Bemmerer, A Caciolli, R Bonetti, C Broggini, F Confortola, P, Corvisiero, H Costantini, Z Elekes, A Formicola, Zs Fulop, G Gervino, A, Guglielmetti, C Gustavino, Gy Gyurky, M Junker, B Limata, M Marta, R, Menegazzo, P Prati, V Roca, C Rolfs, C Rossi Alvarez, E Somorjai, and O
TL;DR
This study directly measures the 15N(p,gamma)16O reaction cross section at novae energies, revealing it is half of what earlier estimates suggested, which impacts our understanding of stellar nucleosynthesis.
Contribution
It provides the first direct measurement of the 15N(p,gamma)16O cross section at novae energies, using a novel experimental setup.
Findings
Cross section is half of previous estimates.
Data obtained at 90-230 keV energies.
Implications for stellar nucleosynthesis models.
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.
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