Direct measurement of the ¹⁹F(p, αγ)¹⁶O reaction in JUNA

Abstract

The 19F(p, αγ)16O reaction is of crucial importance for Galactic 19F abundances and CNO cycle loss in first generation Population III stars. Due to its extremely small cross sections, the 19F(p, αγ)16O reaction has not been measured in the low energy part of the Gamow window(70-200 keV). As a day-one campaign, the experiment was performed under the extremely low cosmicray-induced background environment of the China JinPing Underground Laboratory(CJPL), one of the deepest underground laboratories in the world. The γ-ray yields were measured over Ec.m. =72.4–344 keV, covering the full Gamow window for the first time. The direct experimental data will help people to expound the fluorine over-abundances, energy generation, as well as heavy-element nuclosynthesis scenario in asymptotic giant branch (AGB) stars, with the astrophysical model on the firm ground.

Trojan Horse Investigation for AGB Stellar Nucleosynthesis

“…Recently, the γ-ray yields were measured over E c.m. = 72.4-344 keV, covering the Gamow window [105]. The experiment was performed under the extremely low cosmic-ray-induced background environment of the China JinPing Underground Laboratory and the obtained S(E) factors deviate significantly from previous theoretical predictions, and the uncertainties are significantly reduced.…”