Three-body resonant states in the 9Be nucleus

2016 Fiscal Year Final Research Report

• Project/Area Number: 25400241
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Hokkaido University
• Principal Investigator: KATO KIYOSHI 北海道大学, 理学研究院, 名誉教授 (20109416)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 9Be光分解反応 / α+α+n クラスター模型 / 複素座標スケーリング法 / 多体共鳴状態 / 仮想状態 / クラスターダイポール共鳴

Outline of Final Research Achievements

Using an α+α+n three-cluster model and the complex scaling method (CSM), we investigated the characteristic properties of the 9Be nucleus which is also used as a neutron reflector in nuclear reactors. As a result, observed energy levels of 9Be can be understood as resonant states of a Borromean system which is a three-body system having no bound subsystems except for the ground state. As for the recently observed photo-disintegration cross section, the experimental data can be shown to be explained by the calculation using the CSM. The peak of cross section can be understood to be due to a 8Be+n virtual state but not a resonant state. These results have been reported in many international conferences and 13 published papers.

Free Research Field

原子核物理学