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The isotopes ^261, 262Bh were reinvestigated by using the cold fusion reaction ^54Cr+^209Bi. The evaporation residues were separated by the gas-filled recoil separator SHANS2 (Spectrometer for Heavy Atoms and Nuclear Structure-2) and identified by means of the recoil--correlation method. The -decay properties of ^261, 262Bh were measured and the results are consistent with the previously reported values. Based on the measured half-lives, the existence of two distinct states of ^262Bh was confirmed, whereas ^261Bh lacked any isomer with -decay properties. Two spontaneous fission events potentially from ^262Bh and/or ^261Bh were detected and the production cross sections at beam energies of 264. 1 and 270. 4 MeV were obtained.
Zhao et al. (Wed,) studied this question.