Table of Contents
Journal of Astrophysics
Volume 2013 (2013), Article ID 506146, 13 pages
http://dx.doi.org/10.1155/2013/506146
Research Article

-Process Nucleosynthesis in MHD Jet Explosions of Core-Collapse Supernovae

1Department of Physics, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
2Department of Electronic Control, Kumamoto National College of Technology, Kumamoto 861-1102, Japan

Received 30 March 2013; Accepted 26 August 2013

Academic Editors: W. Cui, Y.-Z. Fan, and J. F. Valdés-Galicia

Copyright © 2013 Motoaki Saruwatari et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigate the -process nucleosynthesis during the magnetohydrodynamical (MHD) explosion of a supernova in a helium star of 3.3 , where effects of neutrinos are taken into account using the leakage scheme in the two-dimensional (2D) hydrodynamic code. Jet-like explosion due to the combined effects of differential rotation and magnetic field is able to erode the lower electron fraction matter from the inner layers. We find that the ejected material of low electron fraction responsible for the -process comes out from just outside the neutrino sphere deep inside the Fe-core. It is found that heavy element nucleosynthesis depends on the initial conditions of rotational and magnetic fields. In particular, the third peak of the distribution is significantly overproduced relative to the solar system abundances, which would indicate a possible -process site owing to MHD jets in supernovae.