arXiv · 1805.06074
A New Measurement of the Intruder Configuration in 12Be
Abstract
A new $^{11}$Be($d,p$)$^{12}$Be transfer reaction experiment was carried out in inverse kinematics at 26.9$A$ MeV, with special efforts devoted to the determination of the deuteron target thickness and of the required optical potentials from the present elastic scattering data. In addition, a direct measurement of the cross sections for the 0$_2^+$ state was realized by applying an isomer-tagging technique. The s-wave spectroscopic factors of 0.20(0.04) and 0.41(0.11) were extracted for the 0$_1^+$ and 0$_2^+$ states, respectively, in $^{12}$Be. Using the ratio of these spectroscopic factors, together with the previously reported results for the p-wave components, the single-particle component intensities in the bound 0$^+$ states of $^{12}$Be were deduced, allowing a direct comparison with the theoretical predictions. It is evidenced that the ground-state configuration of $^{12}$Be is dominated by the d-wave intruder, exhibiting a dramatic evolution of the intruding mechanism from $^{11}$Be to $^{12}$Be, with a persistence of the $N = 8$ magic number broken.
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J. Chen, J. L. Lou, Y. L. Ye, Z. H. Li, D. Y. Pang, C. X. Yuan, Y. C. Ge, Q. T. Li, H. Hua, D. X. Jiang, X. F. Yang, F. R. Xu, J. C. Pei, J. Li, W. Jiang, Y. L. Sun, H. L. Zang, Y. Zhang, N. Aoi, E. Ideguchi, H. J. Ong, J. Lee, J. Wu, H. N. Liu, C. Wen, Y. Ayyad, K. Hatanaka, D. T. Tran, T. Yamamoto, M. Tanaka, T. Suzuki. 2018-05-16. A New Measurement of the Intruder Configuration in 12Be. https://doi.org/10.1016/j.physletb.2018.04.016
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