Abstract
The two reactions {sup 12}C({sup 4}He,{sup 4}He + {sup 4}He + {sup 4}He){sup 4}He and {sup 9}Be({sup 4}He, {sup 4}He + {sup 4}He + {sup 4}He)n were measured using an array of four double-sided strip detectors. Excited states in {sup 12}C were reconstructed filtered by the condition that the {alpha}-decay proceeded via the {sup 8}Be ground state. In both measurements, evidence was found for a new state at 13.3(0.2) MeV with a width 1.7(0.2) MeV. Angular correlation measurements from the {sup 12}C({sup 4}He, {sup 4}He + {sup 4}He + {sup 4}He){sup 4}He reaction indicates that the state may have J{sup {pi}}=4{sup +}.
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