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Description
An inelastic excitation and cluster-decay experiment 2H+16Cwas carried out to investigate the linear-chain clustering structure in neutron-rich 16C. For the first time, decay paths from the 16C resonances to various states of the final nuclei were determined, thanks to the well-resolved Q-value spectra obtained from the threefold coincident measurement. The close-threshold resonance at 16.5 MeV is assigned as the Jπ = 0+ band head of the predicted positive-parity linear-chain molecular band of pi-sigma configuration, according to the associated angular correlation and decay analysis. Other members of this band were found at 17.3, 19.4, and 21.6 MeV based on their selective decay properties, being consistent with the theoretical predictions. Another intriguing high-lying state was observed at 27.2 MeV which decays almost exclusively to 6He + 10Be(∼6 MeV) final channel, corresponding well to another predicted linear-chain structure with the pure σ-bond configuration.
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