SILICON DIODE ARRAYS AS COORDINATE-SENSING DETECTORS FOR NUCLEAR PHYSICS*

The matrixes of silicon diodes integrated on one plate of silicon, can be utilized as coordinate- sensing detectors in researches in the field of nuclear physics. In the given activity are analyzed of their advantage in front of strip-detectors at the large fissile areas and rather small amount of cells. In particularize outcomes of development of matrixes from 6x6 cells having the area of a cell 0,5 cm 2 , feature of their design and production process. In particular, the new designs of guard rings utilized, due to which one the increase of an electrical field near to perimeter р + -п of transition can be completely removed, and also influencing surface drift of ions on detector characteristics is eliminated. The possibilities using of similar designs in gaps between bands of silicon strip-detectors are discussed. The stability of silicon matrixes to γ-radiation 60 Со was investigated. The changes of leakage currents of cells, electric noises, of the C-V characteristics and losses of charges were measured. Last were determined from relations of amplitudes of signals of on α-particles to voltage on the detector and heating-up period of a signal impulse. The spatial resolving power of a matrix can be considerably improved if use a system " a silicon matrix - scintillator CsJ (Tl) ". The position coordinates of absorption of a fragment or photon in a scintillator are determined from ratio of photoelectric signals on adjacent cells. The experimental findings of investigation of such system is resulted.