Year: 2019
Type: conference-paper
Abstract: 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 exoticnuclei 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 newlydeveloped self-triggered injection technique and an in-flight particle identification technique. Here, we report on the present status of R3.
Authors: 阿部, 康志, 山口, 由高 (RIKEN), 上坂, 友洋(RIKEN), Naimi, Sarah(RIKEN), 洲嵜, ふみ(RIKEN/原研), 長江, 大輔(RIKEN/九大), Li, Hongfu((RIKEN/IMP), 大甕, 舜一朗(埼玉大), 山口, 貴之(埼玉大), 荒川, 裕樹(埼玉大), 猪俣, 玖美(埼玉大), 小林, 孝彰(埼玉大), 西室, 国光(埼玉大), 稲田, 康人(埼玉大), 坂上, 護(埼玉大), 細井, 駿(埼玉大), 横田, 健次郎(埼玉大), 梶木, 大輔(埼玉大), 濱川, 大貴(埼玉大), 竇, 文博(埼玉大), 小沢, 顕(筑波大), 森口, 哲朗(筑波大), 向井, もも(筑波大), 上岡, 大起(筑波大), 景澤, 怜央(筑波大), 道正, 新一郎(東大CNS), 大田, 晋輔(東大CNS), 北村, 徳隆(東大CNS), 増岡, 翔一朗(東大CNS), 鈴木, 伸司(IMP), Ge, Zhuang(IMP), Wang, Qian(IMP), Wang, Kailong(CMU), Litvinov, A Yury(GSI), 若杉, 昌徳(理研/京大化研), Abe, Yasushi
Language: Japanese
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Beta decay study of stored highly charged ions, Lifetime measurements of highly charged radioactive ions in storage rings, Study for halo-nuclei by mass measurements in storage-ring, Developments of high efficient system for mass measurements at Rare-RI Ring, Feasibility study on storage-ring spectrometry of superheavy elements, G6951988339
OpenAlex ID: W7145102448