Production of Nb and Ta for chemical studies of element 105, Db, using the GARIS gas-jet system

Huang, M.*; Haba, Hiromitsu*; Murakami, Masashi*  ; Asai, Masato  ; Kaji, Daiya*; Kanaya, Jumpei*; Kasamatsu, Yoshitaka*; Kikunaga, Hidetoshi*; Kikutani, Yuki*; Komori, Yukiko*; Kudo, Hisaaki*; Kudo, Yuki*; Morimoto, Koji*; Morita, Kosuke*; Nakamura, Kohei*; Ozeki, Kazutaka*; Sakai, Ryutaro*; Shinohara, Atsushi*; Sumita, Takayuki*; Tanaka, Kengo*; Toyoshima, Atsushi; Tsukada, Kazuaki  ; Wakabayashi, Yasuo*; Yoneda, Akira*

A technique to utilize radioisotopes of Nb and Ta was developed for chemical studies of element 105, Db, by coupling a gas-jet transport system to the RIKEN gas-filled recoil ion separator (GARIS). The short-lived Nb and Ta were produced with nuclear reactions using a F beam whose energy was the same as that to produce Db. Then, they were separated with GARIS and extracted to a chemistry laboratory with the gas-jet transport system. By changing only magnetic field of GARIS and inserting an energy degrader and a shutter for recoil ions, we could deliver the Nb and Ta to a chemistry device for Db without changing other experimental conditions.