A new 11Be(d,p)12Be transfer reaction experiment was carried out in inverse kinematics at 26.9A 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 02+ 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 01+ and 02+ states, respectively, in 12Be. 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 12Be were deduced, allowing a direct comparison with the theoretical predictions. It is evidenced that the ground-state configuration of 12Be is dominated by the d-wave intruder, exhibiting a dramatic evolution of the intruding mechanism from 11Be to 12Be, with a persistence of the N=8 magic number broken.
@article{arxiv.1805.06074,
title = {A New Measurement of the Intruder Configuration in 12Be},
author = {J. Chen and J. L. Lou and Y. L. Ye and Z. H. Li and D. Y. Pang and C. X. Yuan and Y. C. Ge and Q. T. Li and H. Hua and D. X. Jiang and X. F. Yang and F. R. Xu and J. C. Pei and J. Li and W. Jiang and Y. L. Sun and H. L. Zang and Y. Zhang and N. Aoi and E. Ideguchi and H. J. Ong and J. Lee and J. Wu and H. N. Liu and C. Wen and Y. Ayyad and K. Hatanaka and D. T. Tran and T. Yamamoto and M. Tanaka and T. Suzuki},
journal= {arXiv preprint arXiv:1805.06074},
year = {2018}
}