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New Experimental 23Na(α, p)26Mg Reaction Rate for Massive Star and Type Ia Supernova Models

Fynbo, H. O.U.; Diget, C. Aa; Hubbard, N. J.; Diget, C. Aa.; Fox, S. P.; Fynbo, H. O. U.; Howard, A. M.; Kirsebom, O. S.; Laird, A. M.; Munch, M.; Parikh, A.; Pignatari, M.; Tomlinson, J. R.


H. O.U. Fynbo

C. Aa Diget

N. J. Hubbard

C. Aa. Diget

S. P. Fox

H. O. U. Fynbo

A. M. Howard

O. S. Kirsebom

A. M. Laird

M. Munch

A. Parikh

M. Pignatari

J. R. Tomlinson


The 23Na(α, p)26Mg reaction has been identified as having a significant impact on the nucleosynthesis of several nuclei between Ne and Ti in Type Ia supernovae, and of 23Na and 26Al in massive stars. The reaction has been subjected to renewed experimental interest recently, motivated by high uncertainties in early experimental data and in the statistical Hauser-Feshbach models used in reaction rate compilations. Early experiments were affected by target deterioration issues and unquantifiable uncertainties. Three new independent measurements instead are utilizing inverse kinematics and Rutherford scattering monitoring to resolve this. In this work we present directly measured angular distributions of the emitted protons to eliminate a discrepancy in the assumptions made in the recent reaction rate measurements, which results in cross sections differing by a factor of 3. We derive a new combined experimental reaction rate for the 23Na(α, p)26Mg reaction with a total uncertainty of 30% at relevant temperatures. Using our new 23Na(α, p)26Mg rate, the 26Al and 23Na production uncertainty is reduced to within 8%. In comparison, using the factor of 10 uncertainty previously recommended by the rate compilation STARLIB, 26Al and 23Na production was changing by more than a factor of 2. In Type Ia supernova conditions, the impact on production of 23Na is constrained to within 15%.


Fynbo, H. O., Diget, C. A., Hubbard, N. J., Diget, C. A., Fox, S. P., Fynbo, H. O. U., …Tomlinson, J. R. (2021). New Experimental 23Na(α, p)26Mg Reaction Rate for Massive Star and Type Ia Supernova Models. The Astrophysical journal, 912(1), 59.

Journal Article Type Article
Acceptance Date Mar 15, 2021
Online Publication Date May 5, 2021
Publication Date May 1, 2021
Deposit Date Jan 22, 2022
Publicly Available Date Oct 27, 2022
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 912
Issue 1
Pages 59
Keywords Space and Planetary Science; Astronomy and Astrophysics
Public URL


Published article (788 Kb)

Copyright Statement
© 2021. The Author(s). Published by the American Astronomical Society.<br /> Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.

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