Journal Article

IMPULSE-2022-00120

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png New Experimental $^{23}$Na(α, p)$^{26}$Mg Reaction Rate for Massive Star and Type Ia Supernova Models

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

2021
Institute of Physics Publ. London

Please use a persistent id in citations: doi:10.3847/1538-4357/abee91

Abstract: he $^{23}$Na(α, p)$^{26}$Mg 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 $^{23}$Na and $^{26}$Al 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 $^{23}$Na(α, p)$^{26}$Mg reaction with a total uncertainty of 30% at relevant temperatures. Using our new $^{23}$Na(α, p)26Mg rate, the 26Al and $^{23}$Na production uncertainty is reduced to within 8%. In comparison, using the factor of 10 uncertainty previously recommended by the rate compilation STARLIB, $^{26}$Al and $^{23}$Na production was changing by more than a factor of 2. In Type Ia supernova conditions, the impact on production of $^{23}$Na is constrained to within 15%.

Keyword(s): Nuclei and Particles (1st) ; Particle Physics (2nd)

Note: ISSN 1538-4357 not unique: **2 hits**.

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Contributing Institute(s):

1. DEL (DEL)

Experiment(s):

1. No specific instrument

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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