Abstract
The correlation of the respective directions of emission of the two neutrons in the9Be(n, 2n)8Be reaction has been investigated by using coincidence detection of the outgoing neutrons. In an azimuthal plane, separation angles ranging from 45° to 90 are predominant; a maximum correlation of (20±3)% is obtained at 60°. This angular correlation is attributed to simultaneous emission of two neutrons. Angular distribution measurements on the same reaction proved, by using time-of-flight techniques, that second neutrons are emitted by a compound nucleus, whereas first neutrons are emitted both directly and by a compound nucleus.
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