Fig. 1. The scheme of experiments. Reference

In the work [1] a variety of theoretical investigations were performed, as well as numerical predictions as for the plasma parameters and fast particles (electrons) characteristics were defined more precisely within the range of laser fluxes q = 1017-1018 W/cm2. It was demonstrated that for q = 1017 W/cm2 one can expect hot electron temperature Th = 60 keV, and for q = 10 18 W/cm2- Th = 155 keV. The important feature of the model with which the hot electrons temperature values were obtained is predicted existence of the hot electrons maximum energy (electron spectrum "cut-off energy"). It was shown theoretically that the maximum energy of fast electrons can reach Wmax = 300-400 keV for q = 1017 W/cm2 and Wmax = 900-1000 keV for q = 10 18 W/cm2. Our experimental investigations were aimed at determination of the maximum energy and the quantity of fast electrons in the laser-produced plasma on different targets at q = 1017 W/cm2. We have performed a systematic measurements of the γ-quanta cut-off energy from laser plasma produced on targets made of Be, Al, Cu, Ta, Bi. γ-radiation has been detected with detector based on the nonorganic crystal NaI(Tl) with the sizes ∅40×40 mm3. The scheme of experiments is shown in Fig. 1. Laser radiatio