New High-Precision Measurement of the Reaction Rate of the 18O(p,alpha)15N Reaction via THM
M. La Cognata, C. Spitaleri, A. M. Mukhamedzhanov, B. Irgaziev, R. E., Tribble, A. Banu, S. Cherubini, A. Coc, V. Crucilla, V. Z. Goldberg, M., Gulino, G. G. Kiss, L. Lamia, L. Chengbo, J. Mrazek, R. G. Pizzone, S. M. R., Puglia, G. G. Rapisarda, S. Romano, M. L. Sergi
TL;DR
This study used the Trojan-Horse method to precisely measure the 18O(p,alpha)15N reaction rate, directly evaluating previously uncertain contributions and significantly improving accuracy for astrophysical models.
Contribution
First direct evaluation of the 20-keV peak contribution, increasing previous estimates by about 35%, and an 8.5-fold improvement in measurement accuracy.
Findings
20-keV peak contribution is 35% larger than previous estimates
Improved measurement accuracy by a factor of 8.5
90-keV resonance contribution is negligible for astrophysics
Abstract
The 18O(p,alpha)15N reaction rate has been extracted by means of the Trojan-Horse method. For the first time the contribution of the 20-keV peak has been directly evaluated, giving a value about 35% larger than previously estimated. The present approach has allowed to improve the accuracy of a factor 8.5, as it is based on the measured strength instead of educated guesses or spectroscopic measurements. The contribution of the 90-keV resonance has been determined as well, which turned out to be of negligible importance to astrophysics.
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