Abstract
A gas-jet transport system has been installed to the RIKEN GAs-filled Recoil Ion Separator, GARIS to start up SuperHeavy Element (SHE) chemistry. This system is a promising approach for exploring new frontiers in SHE chemistry: background radioactivities from unwanted by-products are suppressed, a high gas-jet transport yield is achieved, and new chemical reactions can be investigated. Useful radioisotopes of 261 Rfa ,b , 262 Db, and 265 Sga ,b for chemical studies were produced in the reactions of 248 Cm(18 O,5n )261 Rfa ,b , 248 Cm(19 F,5n )262 Db, and 248 Cm(22 Ne,5n )265 Sga ,b , respectively. They were successfully extracted to a chemistry laboratory by the gas-jet method. Production and decay properties of 261 Rfa ,b , 262 Db, and 265 Sga ,b were investigated in detail with the rotating wheel apparatus for α- and spontaneous fission spectrometry. Present status and perspectives of the SHE chemistry at GARIS are also briefly presented.
Highlights
Studies on chemical properties of SuperHeavy Elements (SHEs, atomic number Z ≥ 104) are extremely interesting and challenging research subjects in modern nuclear and radiochemistry [1, 2]
Large amounts of background radioactivities from unwanted reaction products become unavoidable for identifications of SHEs with larger Z, especially Z ≥ 106
Toward the aqueous chemistry of Sg and element 107, Bh, Komori et al [27] have been developing a rapid solvent extraction apparatus coupled to the GAs-filled Recoil Ion Separator (GARIS) gas-jet system
Summary
Studies on chemical properties of SuperHeavy Elements (SHEs, atomic number Z ≥ 104) are extremely interesting and challenging research subjects in modern nuclear and radiochemistry [1, 2]. High-intensity beams from advanced heavy-ion accelerators give rise to a problem in that the plasma formed by the beam in the target/recoil-catcher chamber significantly reduces gas-jet extraction yields To overcome these limitations, a coupling of SHE chemistry to a recoil separator for nuclear physics studies has been considered [4]. An accurate and precise excitation function is necessary for effective production of SHE nuclides with extremely low production yields and for planning of long-term experiments with a costly heavy-ion accelerator The decay properties such as -particle energy and half-life are essential to unambiguously assign SHE nuclides and to derive their chemical information. The recent studies on the production and decay properties of 261Rfa,b, 262Db, and 265Sga,b are summarized together with the SHE chemistry programs at GARIS
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