New result in the production and decay of an isotope, 113 of the 113th element

Morita, Kosuke*; Morimoto, Koji*; Kaji, Daiya*; Haba, Hiromitsu*; Ozeki, Kazutaka*; Kudo, Yuki*; Sumita, Takayuki*; Wakabayashi, Yasuo*; Yoneda, Akira*; Tanaka, Kengo*; Yamaki, Sayaka*; Sakai, Ryutaro*; Akiyama, Takahiro*; Goto, Shinichi*; Hasebe, Hiroo*; Huang, M.*; Huang, T.*; Ideguchi, Eiji*; Kasamatsu, Yoshitaka*; Katori, Kenji*; Kariya, Yoshiki*; Kikunaga, Hidetoshi*; Koura, Hiroyuki   ; Kudo, Hisaaki*; Mashiko, Akihiro*; Mayama, Keita*; Mitsuoka, Shinichi; Moriya, Toru*; Murakami, Masashi*  ; Murayama, Hirofumi*; Namai, Saori*; Ozawa, Akira*; Sato, Nozomi; Sueki, Keisuke*; Takeyama, Mirei*; Tokanai, Fuyuki*; Yamaguchi, Takayuki*; Yoshida, Atsushi*

An isotope of the 113th element, 113, was produced in a nuclear reaction with a Zn beam on a Bi target. We observed six consecutive decays following the implantation of a heavy particle in nearly the same position in the semiconductor detector, in extremely low background condition. The fifth and sixth decays are fully consistent with the sequential decays of Db and Lr both in decay energies and decay times. This indicates that the present decay chain consisted of 113, Rg (Z = 111), Mt (Z = 109), Bh (Z = 107), Db (Z = 105), and Lr (Z = 103) with firm connections. This result, together with previously reported results from 2004 and 2007, conclusively leads the unambiguous production and identification of the isotope 113, of the 113th element.