Investigation of possible applications of Cherenkov technique to measure average energy of beams of relativistic79197Au nuclei in energy range 0.64–0.99 GeV/u

A possibility of using the Cherenkov technique to measure the average energy of collimated relativistic nuclear 79Au beams is investigated in the article for specific beam—radiator interaction (strong deceleration, fragmentation) produces a considerable effect of the spreading of the Cherenkov one. Two Cherenkov methods — achromatic (E, α) and combined (“combi”) — were employed for this purpose. At an energy about 1 GeV/u the accuracy of measurement by the “combi” method was ± 1.4 MeV/u. The accuracy of measurement by the (E, α) method was ±0.9 MeV/u at the energy EAu≈640 MeV/u. These results turned out to be in good agreement with initial EAu0 data from the SIS accelerator with allowances made for energy losses over the beam line (the maximum discrepancy was ≤0.4%). With all the set of these data, the direction condition was for the first time checked for VChR from heavy nuclei. It is shown to be fulfilled to an accuracy above ±5′ in the angle range 27° < ΘCh <38.5°.