PRODUCTION OF 26Al, 44Ti, AND 60Fe IN CORE-COLLAPSE SUPERNOVAE: SENSITIVITY TO THE RATES OF THE TRIPLE ALPHA AND 12C(α, γ)16O REACTIONS
PRODUCTION OF 26Al, 44Ti, AND 60Fe IN CORE-COLLAPSE SUPERNOVAE: SENSITIVITY TO THE RATES OF THE TRIPLE ALPHA AND 12C(α, γ)16O REACTIONS
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DOI：
10.1088/0004-637x/718/1/357
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发表时间：
2009-08
期刊：
影响因子：
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通讯作者：
C. Tur;A. Heger;S. Austin
中科院分区：
文献类型：
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作者：
C. Tur;A. Heger;S. Austin
We have studied the sensitivity to variations in the triple alpha and 12C(α, γ)16O reaction rates of the production of 26Al, 44Ti, and 60Fe in core-collapse supernovae (SNe). We used the KEPLER code to model the evolution of 15 M☉, 20 M☉, and 25 M☉ stars to the onset of core collapse and simulated the ensuing SN explosion using a piston model for the explosion and an explosion energy of 1.2 × 1051 erg. Calculations were performed for the Anders & Grevesse and Lodders abundances. Over a range of twice the experimental uncertainty, σ, for each helium-burning rate, the production of 26Al, 60Fe, and their ratio vary by factors of 5 or more. For some species, similar variations were observed for much smaller rate changes, 0.5σ or less. The production of 44Ti was less sensitive to changes in the helium-burning rates. Production of all three isotopes depended on the solar abundance set used for the initial stellar composition.
