Observational properties of peculiar core-collapse super-novae producing r-process elements Tatsuki Hasegawa, Masaomi Tanaka, Nobuya Nishimura, Kyohei Kawaguchi, Sei Saito and Nanae Domoto EPJ Web Conf., 260 (2022) 11011 Published online: 24 February 2022 DOI: 10.1051/epjconf/202226011011