Observation of the $\pi^2\sigma^2$-bond linear-chain molecular structure in $^{16}$C
Abstract
Measurements of the H(C,CHe+Be or He+Be)H inelastic excitation and cluster-decay reactions have been carried out at a beam energy of about 23.5 MeV/u. A specially designed detection system, including one multi-layer silicon-strip telescope at around zero degrees, has allowed the high-efficiency three-fold coincident detection and therefore the event-by-event determination of the energy of the unstable nucleus beam. The decay paths from the C resonances to various states of the final Be or Be nucleus are recognized thanks to the well-resolved -value spectra. The reconstructed resonances at 16.5(1), 17.3(2), 19.4(1) and 21.6(2) MeV are assigned as the , , and members, respectively, of the positive-parity -bond linear-chain molecular band in C, based on the angular correlation analysis for the 16.5 MeV state and the excellent agreement of decay patterns between the measurements and theoretical predictions. Moreover, another intriguing high-lying state was observed at 27.2(1) MeV which decays almost exclusively to the 6 MeV states of Be, in line with the newly predicted pure -bond linear-chain configuration.
Keywords
Cite
@article{arxiv.2202.05601,
title = {Observation of the $\pi^2\sigma^2$-bond linear-chain molecular structure in $^{16}$C},
author = {J. X. Han and Y. Liu and Y. L. Ye and J. L. Lou and X. F. Yang and T. Baba and M. Kimura and B. Yang and Z. H. Li and Q. T. Li and J. Y. Xu and Y. C. Ge and H. Hua and Z. H. Yang and J. S. Wang and Y. Y. Yang and P. Ma and Z. Bai and Q. Hu and W. Liu and K. Ma and L. C. Tao and Y. Jiang and L. Y. Hu and H. L. Zang and J. Feng and H. Y. Wu and S. W. Bai and G. Li and H. Z. Yu and S. W. Huang and Z. Q. Chen and X. H. Sun and J. J. Li and Z. W. Tan and Z. H. Gao and F. F. Duan and J. H. Tan and S. Q. Sun and Y. S. Song},
journal= {arXiv preprint arXiv:2202.05601},
year = {2022}
}
Comments
13 pages, 10 figures