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New result in the production and decay of an isotope, $$^{278}$$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, $$^{278}$$113, was produced in a nuclear reaction with a $$^{70}$$Zn beam on a $$^{209}$$Bi target. We observed six consecutive $$alpha$$ 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 $$^{262}$$Db and $$^{258}$$Lr both in decay energies and decay times. This indicates that the present decay chain consisted of $$^{278}$$113, $$^{274}$$Rg (Z = 111), $$^{270}$$Mt (Z = 109), $$^{266}$$Bh (Z = 107), $$^{262}$$Db (Z = 105), and $$^{258}$$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 $$^{278}$$113, of the 113th element.

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Category:Physics, Multidisciplinary

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