Abstract
Al26 with a half-life of 7.17×105 years is one of the most significant nuclides in γ-ray astronomy and presolar grains of meteorites. Its main production mechanism in the H-burning MgAl cycle is the Mg25(p,γ)Al26 reaction. In the temperature region of 0.05–0.3 GK of astrophysical interest, the astrophysical Mg25(p,γ)Al26 reaction rate is dominated by the resonant capture of several low-energy resonances. In this work, we report the results of a complete experimental investigation of the Ec.m.=92, 130, and 189 keV resonances in the Mg25(p,γ)Al26 reaction with the Jinping Underground Nuclear Astrophysics Experimental Facility. The updated thermonuclear Mg25(p,γ)Al26 reaction rate is (32–39)% higher than that obtained at the Laboratory for Underground Nuclear Astrophysics around 0.07–0.09 GK, mainly due to the 32% enhancement of the 92-keV resonance strength. The astrophysical impact of our new rate on the Al26 yield in a 5 M⊙ low-metallicity asymptotic giant branch star is investigated, in which an increase of (45–79)% in the Al26 yield is found by adopting our new Mg25(p,γ)Al26 rates.5 MoreReceived 19 December 2022Revised 22 March 2023Accepted 24 April 2023DOI:https://doi.org/10.1103/PhysRevC.107.065801©2023 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasH & He burningH & He induced nuclear reactionsHydrostatic stellar nucleosynthesisNuclear astrophysicsRadiative captureProperties20 ≤ A ≤ 38Nuclear Physics
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