Abstract
A previously published measurement of the reaction of a 59 MeV/nucleon $^{14}\mathrm{Be}$ beam on a deuterated polyethylene target was further analyzed to search for $^{12}\mathrm{He}$ as well as initial state effects in the population of the $^{10}\mathrm{He}$ ground state. No evidence for either was found. A lower limit of about 1 MeV was determined for a possible resonance in $^{12}\mathrm{He}$. In addition, the three-body decay energy spectrum of $^{10}\mathrm{He}$ could not be described by a reaction mechanism calculation based on the halo structure of the initial $^{14}\mathrm{Be}$ assuming a direct $\ensuremath{\alpha}$-particle removal reaction.
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