New additional experiments of -decay spectroscopy for Rf

Asai, Masato  ; Tsukada, Kazuaki  ; Sato, Nozomi*; Sato, Tetsuya   ; Toyoshima, Atsushi; Ishii, Tetsuro  ; Miyashita, Sunao*; Kaneya, Yusuke*; Shibata, Michihiro*; Shima, Yosuke*

We have performed - coincidence and high-resolution -fine structure spectroscopy for Rf, and have obtained new information on nuclear structure of Rf. We have confirmed the existence of two transitions following the decay, and have succeeded in determining the -transition energy very accurately. On the basis of these experimental results, we have estimated the spin-parities and neutron single-particle configurations of the ground- and isomeric states of Rf, and have obtained information on the single-particle configurations and nuclear deformations for heavier superheavy nuclei.