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Report No.

Measurement of mass-symmetric spontaneous fission of $$^{259}$$Lr

Asai, Masato ; Kamada, Hiroki*; Shigekawa, Yudai*; Tsukada, Kazuaki ; Sato, Tetsuya  ; Toyoshima, Atsushi; Mitsukai, Akina; Nagame, Yuichiro; Nishio, Katsuhisa  ; Hirose, Kentaro ; Andreyev, A.; Osa, Akihiko ; Nishinaka, Ichiro*; Shibata, Michihiro*; Tomitsuka, Tomohiro; Goto, Shinichi*; Sakama, Minoru*

To clarify the fission mechanism of mass-symmetric spontaneous fissions observed around the neutron-rich Fm region, we have measured kinetic energies and mass distribution of spontaneous-fission fragments in this nuclear region precisely. The experiment was performed at the JAEA tandem accelerator facility using an on-line isotope separator (ISOL). The mass-separated $$^{259}$$Lr nuclei were implanted into thin foil, and two fragments of their spontaneous fission were coincidently measured with two Si detectors. The spontaneous fission of $$^{259}$$Lr was found to show a narrow symmetric mass distribution. On the other hand, their total kinetic energy TKE was found to be low, which is apparently different from the high-TKE symmetric fissions observed in the Fm isotopes. This indicates that the fission mechanisms of these two symmetric fissions are different.



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