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; M Albers; AD Ayangeakaa; M.P. Carpenter; C.J. Chiara; JL Harker; R. V. F. Janssens; C. Lederer-Woods; D. Seweryniak; F Strieder; S. Zhu

doi:10.1016/j.physletb.2020.136033

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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

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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

A Kankainen, P. J. Woods, D. T. Doherty, H.M Albers, M Albers, AD Ayangeakaa, M.P. Carpenter, C.J. Chiara, JL Harker, R. V. F. Janssens, …

Physics Letters B, Vol.813, 136033

10/02/2021

DOI: https://doi.org/10.1016/j.physletb.2020.136033

Abstract

26Al

Cosmic γ rays

γ spectroscopy

Nuclear Astrophysics

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.

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Title: 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
Creators: A Kankainen - University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
P. J. Woods - University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
D. T. Doherty (Author)
H.M Albers - Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
M Albers - Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
AD Ayangeakaa - Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255, USA
M.P. Carpenter - Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
C.J. Chiara - Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
JL Harker - Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
R. V. F. Janssens - Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3255, USA
C. Lederer-Woods - University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
D. Seweryniak - Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
F Strieder - South Dakota School of Mines & Technology, Department of Physics, Rapid City, SD 57701, USA
S. Zhu - Physics Division, Argonne National Laboratory, Argonne, IL 60439, USA
Publication Details: Physics Letters B, Vol.813, 136033
Publisher: Elsevier
Date published: 10/02/2021
Date accepted: 13/09/2020
Grants: ST/J00006X/1, Science and Technology Facilities Council (United Kingdom, Swindon) - STFC
ERC CoG MAIDEN, 771036, European Union Road Federation (Belgium, Brussels) - ERF
275389, Research Council of Finland (Finland, Helsinki)
J3503, FWF Austrian Science Fund (Austria, Vienna) - FWF
Grant note: This work was supported by The U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-O6CH11357. This research used resources of ANL's ATLAS facility which is a DOE office of Science User Facility. The support from STFC under grant ST/J00006X/1 is gratefully acknowledged. A.K. acknowledges the funding from the European Union's Horizon 2020 research and innovation program under grant agreement No. 771036 (ERC CoG MAIDEN) and Academy of Finland grant No. 275389. This work was supported by The U.S. Department of Energy (DOE), Office of Nuclear Physics, under Grants No. DE-FG02-97ER41033 (TUNL), DE-FG02-97ER41041 (UNC) and DE-FG02-94ER40834 (UMD). C.L.W. acknowledges support from the Austrian Science Fund (FWF): J3503. We thank Gianluca Imbriani for discussions related to the nucleosynthesis of 26Al.
Identifiers: 99694865202346
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article

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

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