Measurement of 23Na (α,p) 26Mg at Energies Relevant to 26Al Production in Massive Stars

J. R. Tomlinson, J. Fallis, A. M. Laird, S. P. Fox, C. Akers, M. Alcorta, M. A. Bentley, G. Christian, B. Davids, T. Davinson, B. R. Fulton, N. Galinski, A. Rojas, C. Ruiz, N. De Séréville, M. Shen, A. C. Shotter

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Al26 is an important radioisotope in astrophysics that provides evidence of ongoing nucleosynthesis in the Galaxy. The Na23(α,p)Mg26 reaction has been identified by a sensitivity study as being one of the most important reactions for the production of Al26 in the convective C/Ne burning shell of massive stars. Owing to large uncertainties in previous experimental data, model calculations are used for the reaction rate of Na23(α,p)Mg26 in this sensitivity study. Current experimental data suggest a reaction rate a factor of ∼40 higher than model calculations. However, a new measurement of this reaction cross section has been made in inverse kinematics in the energy range Ec.m.=1.28-3.15MeV at TRIUMF, and found to be in reasonable agreement with the model calculation. A new reaction rate is calculated and tight constraints on the uncertainty in the production of Al26, due to this reaction, are determined.

Original languageEnglish
Article number052702
Number of pages5
JournalPhysical Review Letters
Issue number5
Publication statusPublished - 29 Jul 2015

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