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Measurement of spontaneous fission of Fm isotopes

Asai, Masato  

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.

Language

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English

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Meeting title

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The 2023 Fall Meeting of the Division of Nuclear Physics of the American Physical Society and Physical Society of Japan (Hawaii 2023); 6th Joint Meeting

Held date

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2023/11

Location (city)

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Waikoloa

Location (country)

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U.S.A.

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Link to research data related to this paper/report.

Keywords

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Fermium 256; Fermium 258; Mendelevium 259; Lawrencium 259; Spontaneous Fission; On-line Isotope Separation; Einsteinium 254 Target; Symmetric fission

Research Facility

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タンデム加速器  

Press Release

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JAEA R&D Navigator

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Cooperating Institute

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Oak Ridge National Laboratory; 名古屋大学; 九州大学; 徳島大学; 理化学研究所; 量子科学技術研究開発機構

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