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Confirmations of the synthesis of $$^{278}$$113 produced by the $$^{209}$$Bi($$^{70}$$Zn,n)$$^{278}$$113 reaction

Morimoto, Koji*; Morita, Kosuke*; Kaji, Daiya*; Haba, Hiromitsu*; Ozeki, Kazutaka*; Kudo, Yuki*; Sato, Nozomi; Sumita, Takayuki*; Yoneda, Akira*; Ichikawa, Takatoshi*; Fujimori, Yasuyuki*; Goto, Shinichi*; Huang, T.*; Ideguchi, Eiji*; Kasamatsu, Yoshitaka*; Katori, Kenji*; Komori, Yukiko*; Koura, Hiroyuki  ; Kudo, Hisaaki*; Murakami, Masafumi*; Ozawa, Akira*; Sakai, Ryutaro*; Tokanai, Fuyuki*; Tsukada, Kazuaki ; Yamaguchi, Takayuki*; Yoshida, Atsushi*

We performed the experiment to synthesize an isotope of the element 113 produced by a $$^{209}$$Bi($$^{70}$$Zn,n)$$^{278}$$113 reaction using a gas-filled recoil ion separator (GARIS) at RIKEN. Two decay chains were observed, and assigned to those originating from an isotope $$^{278}$$113. Both chains were connected into the previously known decays of $$^{266}$$Bh and $$^{262}$$Db via previously unknown decays of $$^{278}$$113, $$^{274}$$Rg, and $$^{270}$$Mt. Although the $$^{266}$$Bh was known nuclide, a number of atoms reported so far was limited. In order to study more precise decay property of the $$^{266}$$Bh, we performed the direct production of $$^{266}$$Bh by the $$^{248}$$Cm($$^{23}$$Na,5n)$$^{266}$$Bh reaction. In this experiment, the $$^{266}$$Bh was clearly identified from the correlation of the nuclide, $$^{262}$$Db. The obtained decay properties of $$^{266}$$Bh and $$^{262}$$Db are consistent with those observed in the $$^{278}$$113 chain, which provided further confirmation of the discovery of $$^{278}$$113.

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