RETRACTED ARTICLE: r-process nucleosynthesis in the MHD+neutrino-heated collapsar jet K. Nakamura, T. Kajino, G. J. Mathews, S. Sato and S. Harikae A&A, 582 (2015) A34 Published online: 01 October 2015 DOI: 10.1051/0004-6361/201526110