24-28 October 2022
La Thanh Hotel, Hanoi, Vietnam
Asia/Ho_Chi_Minh timezone
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Direct Measurement of the Astrophysical ${}^{19}\mathrm{F}(p,\alpha\gamma){}^{16}\mathrm{O}$ Reaction in the Deepest Operational Underground Laboratory

25 Oct 2022, 10:40
30m
Online

Online

Speaker

Jian Jun He (Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China)

Description

Fluorine is one of the most interesting elements in nuclear astrophysics, where the ${}^{19}\mathrm{F}(p,\alpha){}^{16}\mathrm{O}$ reaction is of crucial importance for Galactic ${}^{19}$F abundances and CNO cycle loss in first generation Population III stars. As a day-one campaign at the Jinping Underground Nuclear Astrophysics experimental facility, we report direct measurements of the essential ${}^{19}\mathrm{F}(p,\alpha\gamma){}^{16}\mathrm{O}$ reaction channel. The $\gamma$-ray yields were measured over $E_\mathrm{c.m.}$ = 72.4-344 keV, covering the Gamow window; our energy of 72.4 keV is unprecedentedly low, reported here for the first time. The experiment was performed under the extremely low cosmic-rayinduced background environment of the China JinPing Underground Laboratory, one of the deepest underground laboratories in the world. The present low-energy $S$ factors deviate significantly from previous theoretical predictions, and the uncertainties are significantly reduced. The thermonuclear ${}^{19}\mathrm{F}(p,\alpha\gamma){}^{16}\mathrm{O}$ reaction rate has been determined directly at the relevant astrophysical energies.

Primary author

Jian Jun He (Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China)

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