Flerov Laboratory of Nuclear Reactions

Joint Laboratory Seminar

Date and time: Wednesday, 5 November 2025, at 11:00 AM

Venue: Conference Hall, Flerov Laboratory of Nuclear Reactions

1. Seminar topic: “Cryogenic gas-filled ion cooling cell. Results of recent tests with internal ion source”

   Speaker: Viacheslav Vedeneev

   Abstract:
   

   A new experimental setup for precision mass measurements of the heaviest nuclides (with relative resolution of about ΔM/M~10-7 is being developed at the FLNR. The setup will include a new target block, gas-filled separator for reaction products, cryogenic gas-filled cell (so-called “Cryocell”) and a multi-reflective time-of-flight mass spectrometer. “Cryocell” is one of the most important parts of the planned setup. Braking efficiency as well as the efficiency and time of ion extraction from the cell are the most important parameters for gas-filled cell operation. 49,3±3,0 % efficiency was achieved in the offline tests with an internal ²²³Ra source at a buffer gas pressure of 50 Torr and room temperature. Plans for an “on-beam” experiment with the GRAND gas-filled separator will also be discussed.

   (In connection with the election for the vacant position of a junior researcher.)




2. Seminar topic: “Development of method for producing accelerator targets based on high-temperature binding reduction”

   Speaker: Elizaveta Pishchalnikova

   Abstract:
   

   Development of methods for producing accelerator targets stable under prolong and intense heavy ion irradiation is a priority for advancing research on synthesis and study of the properties of SHE. The main factors influencing target distruction, high temperature, radiation-induced diffusion and chemical reactions are greatly enhanced by increasing ⁴⁸Ca beam intensity and using heavier ions. Therefore a search for stable chemical forms and development of target materials based on the enriched Pu – Cf isotopes that meet experimental requirements is necessary. Intermetallic actinide compounds are known to have high thermal, mechanical and chemical stability. The proposed method includes producing thin films of actinide alloys by two-stage deposition of a diffusion layer and a target layer followed by fusion using “binding reduction” process. The results of studying the obtained europium samples (simulating Am behavior) by modern methods of complex material analysis (SEM, EDS, AFM, XRD and XPS) before and after high-temperature “binding reduction” in hydrogen flow as well as new approaches are discussed.

   (In connection with the election for the vacant position of a junior researcher.)