A ray-trace-type counter telescope for neutron spectrometry

A compact recoil-proton counter telescope with two position sensitive propo rtional counters (PSPCs) for neutron spectrometry has been developed. This counter telescope consists of a radiator (a thin polyethylene film), two PS PCs used as DeltaE detector, and an Si-SSD used as E detector. Using the po sition information extracted from two PSPCs, the three-dimensional trajecto ry of the recoil proton and the recoil angle can be determined event by eve nt. The performance of this counter telescope was tested by the measurement of 7.2-MeV neutrons produced from D-D reactions. It was shown that the ene rgy spectra of neutrons could be obtained by determining the energy of each incident neutron using a recoil angle.