Abstract
The detailed level scheme of 11 Be, including spin-parity assignments, has been established from a β -delayed decay spectroscopy of spin-polarized 11 Li ( Li g.s. 11 → β Be * 11 → n Be * 10 → γ Be g.s. 10 ). From the decay scheme of 11 Be, neutron spectroscopic factors of the levels in 11 Be have been determined. The present results have been compared with the predictions by the Anti-symmetrized Molecular Dynamics (AMD) theory, where various types of α -cluster states have been predicted for the excited states both in 11 Be and 10 Be. Some of the levels in 11 Be show good accord with the 2 α -cluster states in the rotational bands and with a single α -cluster state.
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