-ray spectroscopy of the heaviest nuclei at JAEA tandem accelerator

Asai, Masato  ; Tsukada, Kazuaki  ; Sakama, Minoru*; Ishii, Yasuo; Toyoshima, Atsushi; Ishii, Tetsuro  ; Nishinaka, Ichiro; Nagame, Yuichiro ; Kasamatsu, Yoshitaka; Haba, Hiromitsu*; Kojima, Yasuaki*; Shibata, Michihiro*; Hayashi, Hiroaki*; Sueki, Keisuke*

Recent results on the -ray spectroscopic studies of the heaviest nuclei at the JAEA tandem accelerator are reviewed. The nuclei No, No, and Rf studied in the present work are the heaviest and the most neutron-rich nuclei that -ray spectroscopic studies have ever been performed for. Excited-state energies, spin-parities, and single-particle configurations of those nuclei and their daughters have been established by means of - coincidence spectroscopy. The deduced energy spacings and order of neutron single-particle orbitals suggest that the higher-order deformations play an important role in level structure of the superheavy nuclei in this region.