Speaker
Description
The accelerator complex at RIKEN's Nishina Center for Accelerator Based Science offers presently unparalleled intensity and variety of radioactive ion beams. The accelerator complex employs multiple facilities utilizing in-flight fission and fragmentation, fusion, and multi-nucleon transfer reactions to provide radioactive ion beams spanning the table of isotopes from $^{6}$He to $^{294}$Og. In order to make these beams viable for low-energy experimental techniques (e.g. ion traps) requires the use of high-pressure gas cells. Several such systems are in various states of readiness.
The SHE-mass gas cell, located after the gas-filled recoil ion separator GARIS-II has been successfully operated since 2016. Recent modifications of the SHE-mass system will be discussed and select results presented.
A medium-size gas cell is nearing construction for use in symbiotic measurements. It will be used as a beam dump for in-beam gamma-ray experiments and in conjunction with a multi-reflection time-of-flight mass spectrograph will enhance the in-beam gamma-ray experiments. The design of the system and its planned usage will be discussed.
To provide access to neutron-rich heavy isotopes which are difficult to access via in-flight fission and fragmentation, the KEK Isotope Separation System (KISS) utilizes multi-nucleon transfer reactions. The transfer products are stopped and neutralized in an argon-filled gas cell. Atoms of a desired element can be selectively re-ionized using a two-color resonance laser ionization scheme. Ions of the selected element are accelerated to 30 keV and isobarically purified via a magnetic dipole prior to being delivered to a measurement station. A new "gas-cell cooler-buncher'' has recently been installed to efficiently convert the 30 keV beam to be compatible with ion traps. The system will be described and its performance reported.
