Advancement of Photospheric Radius Expansion and Clocked Type-I X-Ray Burst Models with the New
Phys Rev Lett
; 127(17): 172701, 2021 Oct 22.
Article
em En
| MEDLINE
| ID: mdl-34739292
ABSTRACT
We report the first (in)elastic scattering measurement of ^{25}Al+p with the capability to select and measure in a broad energy range the proton resonances in ^{26}Si contributing to the ^{22}Mg(α,p) reaction at type I x-ray burst energies. We measured spin-parities of four resonances above the α threshold of ^{26}Si that are found to strongly impact the ^{22}Mg(α,p) rate. The new rate advances a state-of-the-art model to remarkably reproduce light curves of the GS 1826-24 clocked burster with mean deviation <9% and permits us to discover a strong correlation between the He abundance in the accreting envelope of the photospheric radius expansion burster and the dominance of ^{22}Mg(α,p) branch.
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MEDLINE
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En
Ano de publicação:
2021
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Article