Experimental programs using Es at the JAEA tandem facility

西尾 勝久

no journal, , 

Experimental programs using Es (=276 days) at the JAEA tandem facility will be introduced. The isotope was produced at the High Flux Isotope Reactor (HFIR) of ORNL, and sub micro-g material was transported to JAEA in 2017. The main subject of the program is to study fission for fermium and heavier-element isotopes, by produce them in charged-particle induced reactions using Es. For the prompt fission measurement in He + Es, correlation between fission-fragment mass and total kinetic energy for Md and its excitation energy dependence were measured. Similar data were also obtained in the spontaneous fissions for Fm and Fm. The results revealed the multi-modal features for heavy and neutron-rich nuclei and its sensitivity on excitation energy and fissioning nucleus. Planned fission measurement using multi-nucleon transfer reactions in O + Es in this year will be discussed, by showing the experimental setup and data taken in other target isotopes. Furthermore, in-beam nuclear structure study and precise mass measurement for heavy- and neutron-rich nuclides will be promoted in the next Es campaign.