Production of Db in the Cm(F,5)Db reaction and decay properties of Db and Lr
Haba, Hiromitsu*; Huang, M.*; Kaji, Daiya*; Kanaya, Jumpei*; Kudo, Yuki*; Morimoto, Koji*; Morita, Kosuke*; Murakami, Masashi* ; Ozeki, Kazutaka*; Sakai, Ryutaro*; Sumita, Takayuki*; Wakabayashi, Yasuo*; Yoneda, Akira*; Kasamatsu, Yoshitaka*; Kikutani, Yuki*; Komori, Yukiko*; Nakamura, Yoshitaka*; Shinohara, Atsushi*; Kikunaga, Hidetoshi*; Kudo, Hisaaki*; Nishio, Katsuhisa ; Toyoshima, Atsushi; Tsukada, Kazuaki
The nuclide Db was produced in the Cm(F,5)Db reaction at beam energies of 103.1 and 97.4 MeV. Decay properties of Db were investigated with a rotating wheel apparatus for and spontaneous fission (SF) spectrometry under low background conditions attained by a gas-jet transport system coupled to the RIKEN gas-filled recoil ion separator. Decay data for Db and its -decay daughter nuclide Lr was improved in statistical accuracy. Examples are the improved half-lives of 33.8 and 3.54 s for Db and Lr, respectively. The production cross sections for the Cm(F,5)Db reaction were determined to be 2.10.7 nb at 103.1 MeV and 0.23 nb at 97.4 MeV, whereas, those for the Cm(F,4)Db reaction were less than 0.064 nb (at 103.1 MeV) and 0.13 nb (at 97.4 MeV). The cross sections are compared with a statistical model calculation carried out by the JAEA group.