Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-04-05
Astrophys.J. 642 (2006) 410-419
Astronomy and Astrophysics
Astrophysics
19 pages with 7 figures, submitted to ApJ
Scientific paper
10.1086/500786
We investigate $r$-process nucleosynthesis during the magnetohydrodynamical (MHD) explosion of supernova in a massive star of 13 $M_{\odot}$. Contrary to the case of the spherical explosion, jet-like explosion due to the combined effects of the rotation and magnetic field lowers the electron fraction significantly inside the layers above the iron core. We find that the ejected material of low electron fraction responsible for the $r$-process comes out from the silicon rich layer of the presupernova model. This leads to the production up to the third peak in the solar $r$-process elements. We examine whether the fission affects the $r$-process paths by using the full nuclear reaction network with both the spontaneous and $\beta$-delayed fission included. Moreover, we pay particular attention how the mass formula affects the $r$-process peaks with use of two mass formulae. It is found that both formulae can reproduce the global abundance pattern up to the third peak though detailed distributions are rather different. We point out that there are variations in the $r$-process nucleosynthesis if the MHD effects play an important role in the supernova explosion.
Fujimoto Shin-ichiro
Hashimoto Masa-aki
Kotake Kei
Nishimura Nobuya
Nishimura Sunao
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