Cosmological Nucleosynthesis in the Big-Bang and Supernovae
| dc.creator | Kajino, Toshitaka | |
| dc.date | 2002-03-13 | |
| dc.date.accessioned | 2026-07-07T02:03:06Z | |
| dc.date.available | 2026-07-07T02:03:06Z | |
| dc.description | Recent observation of the power spectrum of Cosmic Microwave Background (CMB) Radiation has exhibited that the flat cosmology is most likely. This suggests too large universal baryon-density parameter $Ω_b h^2 \approx 0.022 \sim 0.030$ to accept a theoretical prediction, $Ω_b h^2 \le 0.017$, in the homogeneous Big-Bang model for primordial nucleosynthesis. Theoretical upper limit arises from the sever constraints on the primordial $^7$Li abundance. We propose two cosmological models in order to resolve the descrepancy; lepton asymmetric Big-Bang nucleosynthesis model, and baryon inhomogeneous Big-Bang nucleosynthesis model. In these cosmological models the nuclear processes are similar to those of the r-process nucleosynthesis in gravitational collapse supernova explosions. Massive stars $\geq 10 M_{\odot}$ culminate their evolution by supernova explosions which are presumed to be the most viable candidate site for the r-process nucleosynthesis. Even in the nucleosynthesis of heavy elements, initial entropy and density at the surface of proto-neutron stars are so high that nuclear statistical equilibrium favors production of abundant light nuclei. In such explosive circumstances many neutron-rich radioactive nuclei of light-to-intermediate mass as well as heavy mass nuclei play the significant roles. | |
| dc.description | 6 pages, 4 figures, uses jnstcite.sty, nd2001_2.sty and article-nd2001_2.cls, J. Nucl. Sci. Technol., in press | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0203197 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0203197 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/4272 | |
| dc.subject | Astrophysics | |
| dc.title | Cosmological Nucleosynthesis in the Big-Bang and Supernovae | |
| dc.type | text |