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Report No.
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Productions and decay properties of $$^{264,265}$$Hs

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

In this work, the production and decay properties of $$^{264,265}$$Hs produced in the $$^{208}$$Pb($$^{58}$$Fe, $$xn$$) [$$x = 1,2$$] and $$^{207}$$Pb($$^{58}$$Fe, $$n$$) reactions were investigated. The experiment was performed at the RILAC facility in RIKEN. The evaporation residues (ERs) were separated from the primary beam with the gas-filled recoil ion separator, GARIS. In the focal plane of GARIS the products were implanted into a position-sensitive Si detector for measuring the arrival of ERs and subsequent $$alpha$$-decays or spontaneous fission from ERs. We have measured production cross-sections of $$^{264,265}$$Hs in the $$^{58}$$Fe + $$^{208}$$Pb reaction at several bombarding energies. For the $$^{208}$$Pb($$^{58}$$Fe, $$n$$)$$^{265}$$Hs reaction, the cross-section maximum of ($$51^{+46}_{-29}$$) pb was obtained at the bombarding energy of 220.5 MeV at the middle of the target. For even-even nucleus $$^{264}$$Hs, we have also observed accurate decay data with good statistics.

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