Abstract

Pulse height and risetime distributions of signals from a 3He proportional counter have been investigated to discriminate undersirable signals arising from the 3He recoil and wall effect. The risetimes of the wall effect suffered pulses are distributed in the slower region and that of the recoiled helium atoms, in the faster and narrow region in comparison with that of the 3He(n,p)T reaction. One can distinguish the full energy signal from the undersirable ones by appropriate risetime selection. Anisotropy of the pulse height and risetime distribution was also measured for the parallel and vertical neutrons incident to the counter axis.

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