GT transitions built on excited states by establishing isomer beam experiments

2017 Fiscal Year Final Research Report

• Project/Area Number: 15H03672
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: SAKAI Hideyuki 国立研究開発法人理化学研究所, 仁科加速器研究センター, 部長 (90030030)
• Co-Investigator(Renkei-kenkyūsha): YAKO Kentaro 東京大学, 理学系研究科・原子核科学研究センター, 准教授 (50361572) ; MICHIMASA Shin'ichiro 東京大学, 理学系研究科・原子核科学研究センター, 助教 (80392140)
• Research Collaborator: OTA Shinsuke 東京大学, 理学系研究科・原子核科学研究センター, 助教 ; KAWATA Keita 東京大学, 理学系研究科・原子核科学研究センター, 大学院生
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: 実験核物理 / アイソマービーム / 破砕核反応 / ダイヤモンド検出器

Outline of Final Research Achievements

The main aim of this research is to establish a technical method to discriminate an isomeric state via a TOF measurement in the beam line and to find a fragmentation reaction to have a large isomeric ratio.
We achieved the time resolution of 40 ps in FWHM by utilizing a diamond detector and a fast preamplifier system. This value is enough for the future isomer-(p,n) measurement. We searched for a fragmentation reaction which has a high isomer ratio R for 52Fe(12+). The systematic study was made for the primary beams of 58Ni, 59Co and 82Kr. We finally found that the fragmentation reaction of 82Kr->52Fe(12+)+10p20n has about R～35%. This R value is the minimum value that can be applied for the the future experiment.
Thus the initial aims are completely fulfilled.

Free Research Field

原子核物理学