量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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We constructed the isochronous storage ring named “Rare-RI Ring (R3)” at RIKEN RI Beam Factory. Recently, we demonstrated a high-precision mass-measurement capability for the extremely short-lived and rarely-produced exotic
nuclei by means of the time-of-flight based mass-spectrometry using R3. We measured one-by-one the revolution times for accepted nuclei including not only the mass-reference nucleus but also the unknown-mass nuclei. One of the massreference nuclei circulates under the isochronous condition. The momentum dependence of the revolution times of stored nuclei was corrected by using their velocities measured in the beam transport line before the injection. Consequently, the mass-to-charge ratios are proportional to the corrected revolution time, and the mass precision is ensured by the precision of the isochronism. We have introduced an event-by-event technique for the first time in the storage ring experiment to make precision mass measurement for extremely rarely produced nuclei possible. That was established with a newly
developed self-triggered injection technique and an in-flight particle identification technique. Here, we report on the present status of R3.
理研RIBFにおける稀少RIリングの現状 (2)
