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Determination of the cluster-decay branching ratio from a near-threshold molecular state in $^{10}$Be

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arxiv 2003.02457 v1 pith:TRCBUNB7 submitted 2020-03-05 nucl-ex

W. Jiang , Y. L. Ye , C. J. Lin , Z. H. Li , J. L. Lou , X. F. Yang , Q. T. Li , Y. C. Ge
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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
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keywords statealphacluster-decaynear-thresholdbranchingclustermeasurementmolecular
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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.

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