학술논문
Determination of the cluster-decay branching ratio from a near-threshold molecular state in $^{10}$Be
Document Type
Working Paper
Author
Jiang, W.; Ye, Y. L.; Lin, C. J.; Li, Z. H.; Lou, J. L.; Yang, X. F.; Li, Q. T.; Ge, Y. C.; Hua, H.; Jiang, D. X.; Pang, D. Y.; Li, J.; Chen, J.; Yang, Z. H.; Sun, X. H.; Tian, Z. Y.; Feng, J.; Yang, B.; Zang, H. L.; Liu, Q.; Li, P. J.; Chen, Z. Q.; Liu, Y.; Zhang, Y.; Ma, J.; Jia, H. M.; Xu, X. X.; Yang, L.; Ma, N. R.; Sun, L. J.
Source
Subject
Language
Abstract
A puzzle has long existed for the $\alpha$-cluster content in the near-threshold 7.54 MeV state of $^{10}$Be. A new measurement was conducted to measure the cluster-decay partial width of this state, using the reaction $\rm{^9Be}(\rm{^9Be}, \rm{^{10}Be}^{*} \rightarrow \alpha + \rm{^6He})\rm{^8Be}$ at 45 MeV beam energy. Special measures were taken to reduce the strong near-threshold background. The neutron-decay strength was also obtained based on the three-fold coincident measurement. A cluster-decay branching ratio of $(4.04 \pm 1.26)\times 10^{-4}$ is obtained, resulting in a reasonably large $\alpha$-cluster spectroscopic factor. The present work confirms the formation of the $\sigma$-bond molecular rotational band headed by the 6.18 MeV state in $^{10}$Be.