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Report No.
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Productions and decay properties of a new isotope of $$^{263}$$Hs

Kaji, Daiya*; Morimoto, Koji*; Sato, Nozomi; Haba, Hiromitsu*; Ichikawa, Takatoshi*; Ideguchi, Eiji*; Koura, Hiroyuki   ; Kudo, Yuki*; Ozawa, Akira*; Ozeki, Kazutaka*; Sumita, Takayuki*; Yamaguchi, Takayuki*; Yoneda, Akira*; Yoshida, Atsushi*; Morita, Kosuke*

A new neutron deficient hassium ($$Z=108$$) isotope of $$^{263}$$Hs was identified via two different reactions of $$^{206}$$Pb($$^{58}$$Fe,$$n$$) and $$^{208}$$Pb($$^{56}$$Fe,$$n$$) by using the gas-filled recoil separator GARIS. During irradiation of $$^{206}$$Pb with the $$^{58}$$Fe beam and irradiation of $$^{208}$$Pb with the $$^{56}$$Fe beam, 8 decay chains and 1 decay chain, respectively, were observed. The properties of decay events obtained by irradiation of $$^{58}$$Fe on $$^{206}$$Pb match well with those by irradiation of $$^{56}$$Fe on $$^{208}$$Pb. The mean $$alpha$$-decay energies for the 3 groups are 10.82, 10.55, and 10.37 MeV, respectively. The half-life of $$^{263}$$Hs is determined to be 0.60 ms.

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