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Oral presentation

Measurement of spontaneous fission of Fm isotopes

Asai, Masato

no journal, , 

Fission-fragment mass distributions and total kinetic energy (TKE) distributions for the spontaneous fission of $$^{256}$$Fm, $$^{258}$$Fm, $$^{259}$$Md, and $$^{259}$$Lr have been measured precisely. These nuclei were produced in the multinucleon transfer reactions with the $$^{18}$$O beam and the $$^{254}$$Es target, and in the fusion-evaporation reaction of $$^{248}$$Cm($$^{15}$$N,4n)$$^{259}$$Lr at the JAEA tandem accelerator facility. The reaction products were mass-separated with the on-line isotope separator (ISOL), and the kinetic energies of spontaneous-fission fragments were measured with 4 pairs of Si semiconductor detectors. The results revealed that the three types of fission, the high-TKE and low-TKE symmetric fissions and asymmetric fission, compete or coexist in this neutron-rich Fm region.

Oral presentation

Measurement of mass and total kinetic energy distribution for spontaneous fission of $$^{259}$$Md

Asai, Masato; Ishibashi, Yuichi*; Tsukada, Kazuaki; Sato, Tetsuya; Aoki, Ryota*; Ito, Yuta; Uchibaba, Yuta*; Orlandi, R.; Gong, G.-M.*; Suzaki, Fumi; et al.

no journal, , 

Measurement of mass and total kinetic energy (TKE) distribution for the spontaneous fission (SF) of $$^{259}$$Md has been performed to clarify the fission mechanism in the neutron-rich fermium region. $$^{259}$$Md nuclei were produced with the $$^{254}$$Es target and $$^{18}$$O beam, and mass-separated with an on-line isotope separator (ISOL). We discuss the mechanism of fission observed in the SF of $$^{259}$$Md on the basis of the observed mass-TKE distribution.

Oral presentation

Symmetric fission properties of neutron-rich transfermium nuclei

Asai, Masato

no journal, , 

Symmetric fission properties of neutron-rich transfermium nuclei have been studied through the measurements of spontaneous fission fragments of $$^{258}$$Fm, $$^{259}$$Md, and $$^{259}$$Lr. These nuclei were produced in the multinucleon transfer reactions with the $$^{18}$$O beam and the $$^{254}$$Es target, and in the fusion-evaporation reaction of $$^{248}$$Cm($$^{15}$$N,4n)$$^{259}$$Lr at the JAEA tandem accelerator facility. The reaction products were mass-separated with the on-line isotope separator (ISOL), and the kinetic energies of spontaneous-fission fragments were measured with 4 pairs of Si semiconductor detectors. The deduced fission-fragment mass distributions and total kinetic energy distributions have revealed the detailed properties of symmetric fissions in this neutron-rich Fm and transfermium nuclei.

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