Investigation of rechanneling and dynamic equilibrium effects in crystals

The rechanneling and dynamic equilibrium effects are experimentally investigated in straight crystals at 70 GeV. From the Lindhard reversibility rule the qualitative analysis of the volume-capture possibilities in bent crystals is performed. For the beam with narrow angular distribution there was observed an enhancement of the effective dechanneling length, a few times larger as compared to the 'ordinary' length, at the channeling in a straight crystal. For the beam with broad angular distribution there was observed a dynamical equilibrium state, when the number of channeled particles neither decrease not increase over the length 65 mm. The experimental date are in agreement with simple qualitative estimates. 11 refs.; 4 figs