A resonance problem on the low-lying resonant state in the 9Be system

3rd International Workshop on "State of the Art in Nuclear Cluster Physics"

Odsuren, Myagmarjav^1 ; Kat, Kiyoshi^2 ; Kikuchi, Yuma^3 ; Aikawa, Masayuki^2 ; Myo, Takayuki^4,5

Nuclear Research Center, National University of Mongolia, Ulaanbaatar

210646, Mongolia^1

Nuclear Reaction Data Centre, Faculty of Science, Hokkaido University, Sapporo

060-0810, Japan^2

RIKEN Nishina Center, Wako

351-0198, Japan^3

General Education, Faculty of Engineering, Osaka Institute of Technology, Osaka

535-8585, Japan^4

Research Centre for Nuclear Physics (RCNP), Osaka University, Ibaraki

567-0047, Japan^5

关键词: Breakup cross sections;    Breakup mechanisms;    Experimental values;    Photo-disintegration;    Resonance problem;    Resonant state;    Standing problems;    Three-body clusters;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/569/1/012072/pdf
DOI  :  10.1088/1742-6596/569/1/012072

来源: IOP

【 摘 要 】

The photo-disintegration cross section of9Be is investigated in a framework of the α + α + n three-body cluster model. Much interest is concentrated on the nature of the 1/2+state of9Be located just above the three-body threshold. The existence of this 1/2+resonance is a long-standing problem and has been a topic of quite interest in relation to the breakup mechanism of9Be into the8Be(0+)+n and (α + α + n) channels. The newly measured breakup cross sections of the 1/2+ state of Ref. [1] is inconsistent with the old experimental values [2, 3]. The purpose of this study is to clarify the properties of the 1/2+ state of9Be with the possibility of a genuine three-body (α + α + n) resonance or the two-body (8Be(0+)+n) virtual state.