AMOUNT OF ANTIPROTONS IN COSMIC-RAYS DUE TO HALO NEUTRALINO ANNIHILATION

We evaluate the antiproton-to-proton flux ratio which can be generated by neutralino-neutralino annihilation in the galactic halo, consideri ng the most general compositions for the relic neutralinos and modelli ng the neutralino local density according to its relic abundance. We f ind that in the case of mixed neutralino compositions this (p) over ba r/p ratio is higher than for pure Higgsinos or gauginos. It is shown h ow the expected improvements in sensitivity for the new measurements o f the (p) over bar/p may provide very useful information, complementar y to the one obtainable with other experimental means.