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Decay of the key 92-keV resonance in the 25Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter 26Al

J.L. Harker, M.P. Carpenter, C.J. Chiara, S. Zhu, A. Kankainen, A.D. Ayangeakaa, M. Albers, D. Seweryniak, C. Lederer-Woods, D.T. Doherty, P.J. Woods, H.M. Albers (+2 others)
2021

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The 92-keV resonance in the 25Mg(p,γ)26Al reaction plays a key role in the production of 26Al at astrophysical burning temperatures of ≈100 MK in the Mg-Al cycle. However, the state can decay to feed either the ground, 26gAl, or isomeric state, 26mAl. It is the ground state that is critical as the source of cosmic γ rays. It is therefore important to precisely determine the ground-state branching fraction f0 of this resonance. Here we report on the identification of four γ-ray transitions from
more » ... he 92-keV resonance, and determine the spin of the state and its ground-state branching fraction f0=0.52(2)stat(6)syst. The f0 value is the most precise reported to date, and at the lower end of the range of previously adopted values, implying a lower production rate of 26gAl and its cosmic 1809-keV γ rays.
doi:10.17615/bzdg-eq86 fatcat:z2rcbdd3mzgzlbtfnvy2vqzc2m
Citation

J.L. Harker, M.P. Carpenter, C.J. Chiara, S. Zhu, A. Kankainen, A.D. Ayangeakaa, M. Albers, D. Seweryniak, C. Lederer-Woods, D.T. Doherty, P.J. Woods, H.M. Albers, F. Strieder, R.V.F. Janssens. "Decay of the key 92-keV resonance in the 25Mg(p,γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter 26Al." (2021)