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| Paper: |
Radioactivities from Supernovae and Its Application to Cosmochronology |
| Volume: |
458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way |
| Page: |
17 |
| Authors: |
Nakamura, K.; Hayakawa, T.; Cheoun, M.-K.; Chiba, S.; Kajino, T.; Mathews, G. J. |
| Abstract: |
An excess of 92Zr observed in meteorites suggests that the solar system was rich in the parent radioactive nuclei 92Nb (half life ∼ 34.7 Myr) at its formation epoch. We have investigated the neutrino-induced 92Nb production in core-collapse supernovae and estimated the abundance ratio of 92Nb to 93Nb with newly calculated reaction rates. The isotopic ratio of 10–5 from our simulations is supported by the analyses of primitive meteorites (Schönbächler et al. 2002, 2005). We infer the timescale from the last supernova event to the solar system formation to be 30 million years, which is consistent with r-process chronometric study. |
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