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

A. Kankainen, P. J. Woods, D. T. Doherty, H M Albers, A D Ayangeakaa, M P Carpenter, C. J. Chiara, J. L. Harker, R V F Janssens, C. Lederer-Woods, D. Seweryniak, F Strieder, S. Zhu

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Abstract

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 the 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.
Original languageEnglish
Article number136033
Pages (from-to)1-4
Number of pages4
JournalPhysics Letters B
Volume813
Early online date16 Dec 2020
DOIs
Publication statusPublished - 10 Feb 2021

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