arXiv · 2003.02457
Determination of the cluster-decay branching ratio from a near-threshold molecular state in $^{10}$Be
Abstract
A puzzle has long existed for the $α$-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 $\rm{^9Be}(\rm{^9Be}, \rm{^{10}Be}^{*} \rightarrow α+ \rm{^6He})\rm{^8Be}$ 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 $α$-cluster spectroscopic factor. The present work confirms the formation of the $σ$-bond molecular rotational band headed by the 6.18 MeV state in $^{10}$Be.
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W. Jiang, Y. L. Ye, C. J. Lin, Z. H. Li, J. L. Lou, X. F. Yang, Q. T. Li, Y. C. Ge, H. Hua, D. X. Jiang, D. Y. Pang, J. Li, J. Chen, Z. H. Yang, X. H. Sun, Z. Y. Tian, J. Feng, B. Yang, H. L. Zang, Q. Liu, P. J. Li, Z. Q. Chen, Y. Liu, Y. Zhang, J. Ma, H. M. Jia, X. X. Xu, L. Yang, N. R. Ma, L. J. Sun. 2020-03-05. Determination of the cluster-decay branching ratio from a near-threshold molecular state in $^{10}$Be. https://doi.org/10.1103/physrevc.101.031304
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