| タイトル | Cosmological quantum chromodynamics, neutron diffusion, and the production of primordial heavy elements |
| 著者（英） | Hogan, Craig J.; Scherrer, R. J.; Applegate, J. H. |
| 著者所属（英） | Columbia Univ.|Arizona Univ.|Harvard-Smithsonian Center for Astrophysics |
| 発行日 | 1988-06-15 |
| 言語 | eng |
| 内容記述 | A simple one-dimensional model is used to describe the evolution of neutron density before and during nucleosynthesis in a high-entropy bubble left over from the cosmic quark-hadron phase transition. It is shown why cosmic nucleosynthesis in such a neutron-rich environment produces a surfeit of elements heavier than lithium. Analytical and numerical techniques are used to estimate the abundances of carbon, nitrogen, and heavier elements up to Ne-22. A high-density neutron-rich region produces enough primordial N-14 to be observed in stellar atmospheres. It shown that very heavy elements may be created in a cosmological r-process; the neutron exposure in the neutron-rich regions is large enough for the Ne-22 to trigger a catastrophic r-process runaway in which the quantity of heavy elements doubles in much less than an expansion time due to fission cycling. A primordial abundance of r-process elements is predicted to appear as an excess of rare earth elements in extremely metal-poor stars. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 88A41582 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/370327 |
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