| Budget Amount *help |
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
We investigate effects of triple-α and 12C(α,γ)16O reaction rates on the production of supernova yields for a massive star of 25Ms. We combine the reaction rates to examine the rate dependence, where the rates are considered to cover the possible variation of the rates based on the experiments on the earth and theories. We adopt four combinations of the reaction rates from the two triple-α reaction rates and two 12C(α,γ)16 ones. First, we compare the stellar evolutionary results for massive stars of 20 and 25 Mｓ whose helium cores correspond to helium stars of 6 and 8 M,ｓrespectively. we perform calculations of supernova explosions within the limitation of spherical symmetry and compare the calculated abundance ratios with the solar system abundances. We can deduce some constraints to the reaction rates.As the results, the conventional rate is adequate for the triple-αreaction rate and rather higher value 12C(α,γ)16O rate.
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