High-resolution fine-structure spectroscopy for studying nuclear structure of heavy nuclei

Asai, Masato  ; Haba, Hiromitsu*; Sato, Nozomi; Kasamatsu, Yoshitaka*; Kaji, Daiya*; Morimoto, Koji*; Morita, Kosuke*; Shima, Yosuke*; Shibata, Michihiro*; Tsukada, Kazuaki  ; Sato, Tetsuya   ; Toyoshima, Atsushi; Ishii, Tetsuro  ; Nagame, Yuichiro 

We have developed high-resolution fine-structure spectroscopy for studying nuclear structure of short-lived heavy actinide nuclei. It has been demonstrated that spin-parities and single-particle configurations of the ground state of a parent nucleus as well as excited states in a daughter nucleus can be determined only through the measured singles spectrum. To achieve a good energy resolution of 11 keV, conditions to make a thin source have been optimized. Using this technique, we have identified proton single-particle configurations of Lr, Lr, Lr, and Lr for the first time.