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The shape and normalisation of the beta-delayed alpha spectrum from 11Be wasmeasured by implanting 11Be ions in a segmented Si detector. The spectrum isfound to be dominated by a well-known transition to the 3/2+ state at Ex =9.87MeV in 11B. A significant increase in the observed decay strength towardsthe higher end of the Q window means, however, that the 9.87MeV state cannotalone be responsible for the transition. Using the R-matrix framework we findthat the inclusion of an extra 3/2+ state at Ex = 11.49(10)MeV is required inorder to obtain a satisfactory description of the spectrum. Both states showlarge widths towards alpha decay, exhausting significant fractions of theWigner limit, a typical signature of alpha clusterisation. The observedGamow-Teller strength indicate large overlaps between the two states and theground state of 11Be.

Clarification of large-strength transitions in the beta decay of 11Be