Detectors of 2.45 MeV neutrons and 3.02 MeV protons are designed for experiments with injection of deuterium beams in a small mirror section of the GDT (Gas Dynamic Trap) facility. The detector is based on a photomultiplier tube with a "fine mesh" dynode system and an organic scintillator. The detectors are operated in the mode of single-particle counting with the temporal resolution of ~20 ns.