Presupernova collapse models with improved weak-interaction rates

Improved values for stellar weak-interaction rates have been recently calculated based upon a large shell-model diagonalization. Using these new rates (for both beta decay and electron capture), we have examined the presupernova evolution of massive stars in the range (15--40)M(o). Comparing our new...

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Bibliographic Details
Published in:Physical review letters 2001-02, Vol.86 (9), p.1678-1681
Main Authors: Heger, A, Langanke, K, Martínez-Pinedo, G, Woosley, S E
Format: Article
Language:English
Subjects:
BETA DECAY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ELECTRONS
EXPLOSIONS
IRON
NUCLEOSYNTHESIS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
STARS
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Summary:Improved values for stellar weak-interaction rates have been recently calculated based upon a large shell-model diagonalization. Using these new rates (for both beta decay and electron capture), we have examined the presupernova evolution of massive stars in the range (15--40)M(o). Comparing our new models with a standard set of presupernova models by Woosley and Weaver, we find significantly larger values for the electron-to-baryon ratio at the onset of collapse and smaller iron core masses. These changes may have important consequences for nucleosynthesis and the supernova explosion mechanism.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.86.1678