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内容記述 |
We study the nucleosynthesis in a core-collapse supernova model including newly calculated neutrino induced reactions rates with both collective and MSW neutrino-flavor oscillations considered. We show that the measurement of a pair of 11B/10B and 138La/139La or 6Li/7Li and 138La/139La in supernovae silicon carbide X presolar grains could constrain the neutrino mass hierarchy. The new shell-model and the model of quasi-particle random phase approximation in the estimate of three important neutrino induced reactions, ν+16O, ν+20Ne, and ν+138Ba are applied in reaction network. The new rates decrease the calculated 7Li/6Li ratio by a factor of five compared with the previous study. More interestingly, these new rates result in a clear separation of the isotopic ratio of 11B/10B between normal and inverted mass hierarchies in the O-Ne-Mg layer where 138La abundance depends strongly on the mass hierarchy. In this layer, the sensitivity of the calculated abundances of 10,11B and 6,7Li to the nuclear reaction uncertainties is also tiny. Therefore, we propose that the 11B/10B vs. 138La/139La and 6Li/7Li vs. 138La/139La in silicon carbide X grains can be new probe to constrain the neutrino mass hierarchy. |
