Study for halo-nuclei by mass measurements in storage-ring

2020 Fiscal Year Final Research Report

• Project/Area Number: 18H03695
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 15:Particle-, nuclear-, astro-physics, and related fields
• Research Institution: University of Tsukuba
• Principal Investigator: Ozawa Akira 筑波大学, 数理物質系, 教授 (80260214)
• Co-Investigator(Kenkyū-buntansha): 山口 由高 国立研究開発法人理化学研究所, 仁科加速器科学研究センター, 技師 (40415328)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Keywords: 原子核の質量 / 蓄積リング / 不安定核

Outline of Final Research Achievements

RI Beam Factory in RIKEN (RIBF) is presently most intense unstable nuclear beam facility in the world. Rare-RI Ring (R3) in RIBF is motivated by mass measurements for unstable nuclei, that are located very far from the stability. R3 is operated from FY 2015. However, since R3 is shortly after the operation, accuracy for mass measurements was insufficient. In this research, we upgraded kicker magnets in R3 and detectors for mass measurements. Thus, we could increase the accuracy. Hereafter we will perform precise mass measurements for unstable nuclei in R3.

Free Research Field

原子核実験物理学

Academic Significance and Societal Importance of the Research Achievements

不安定核の蓄積リングは、質量測定だけでなく、寿命測定を行うことができる。また、多価イオンを蓄積できるので、多価状態のベータ崩壊など、通常とは異なる物理現象の観測も可能になる。理研RIビームファクトリー(RIBF)は、現在、世界最強のRIビーム施設であり、ハロー原子核を含む安定線から遠く離れた不安定核を数多く作ることができる。本研究により、RIBFの蓄積リングをアップグレードしたことで、RIBFでの不安定核研究をより高めることに貢献した。