Speaker
Description
Since 1998, experiments on the synthesis of superheavy elements (SHE) have been carried out at the Flerov Laboratory of Nuclear Reactions (FLNR) of the Joint Institute for Nuclear Research (JINR) on a gas-filled recoil separator (DGFRS). The heaviest element 294Og with Z = 118 was registered in 2002, 2005, 2012 and 2015. In all these experiments, 48Ca heavy ion beams accelerated at the U-400 cyclotron were used. Further use of calcium ions as an incident projectile does not allow the synthesis of elements heavier than 294Og, since there is no sufficiently stable target material. To conduct further studies of SHEs at the JINR FLNR, the SHE Factory based on the new DC-280 cyclotron was created. Achieved beam intensity is 10 times higher than U-400. The first experimental setup of the SHE Factory is the new DGFRS-II which have configuration of QDQQD magnets (Q – quadrupole, D – dipole). The main feature of this setup is the high collection efficiency of synthesized superheavy nuclei, exceeds 60% for targets up to 0.5 mg/cm2 thick, which is 2 times higher than DGFRS-I. In 2019, test experiments on the new separator were conducted. The main goal of this experiments was to determine the optimal parameters of the DGFRS-II separator:
170Er + 48Ca —> 214,215Ra,
natYb, 174Yb + 48Ca —> 216,217Th.
In this talk, results of this experiments are shown. For each experimental reaction charge of the synthetized nuclei were calculated together with dispersion on two main dipoles. Energy losses during evaporation residues transport were calculated as well.
