ANTIPROTON NUCLEI ANNIHILATION IN THE MOMENTUM RANGE 0.70-2.50-GEV C/

The results of the measurements of the antiproton annihilation cross s ections on the nuclei Be, C, Al, Fe, Cu, Cd, and Pb at the momentum ra nge 0.70 - 2.50 GeV/c are presented. The A-dependence of the cross sec tions is described by the formula sigma(0)A(alpha). The behavior of th e parameters sigma(0) and alpha does not agree with optical model in t he Glauber approach. It is suggested that such a behavior is a result of the Coulomb influence on the annihilation processes at the low mome nta. The description of cross sections using formula sigma = A(2/3)(a( 0) + a(1)Z + a(2)Z(2)) is made and the parameters a(0), a(1), and a(2) are evaluated. In the framework of the high-energy approach, the form ula for the absorption cross section is derived: sigma(abs) = -2/($) o ver bar hv integral d(2) bdz Im V exp{(ik integral(-infinity)(z)[root 1+2/pv V-root 1+2/pv V]d xi)}. This formula takes into account the in fluence of the Coulomb potential and the real part of the nuclear pote ntial on the absorption cross section. A comparison with the experimen tal results is made in the framework of the Glauber optical model. The agreement is not good.