Escape of charged particles at stopping annihilation of antiprotons in the heavy nuclei of nuclear photoemulsion

"Rare" annihilation channels for antiprotons stopping on heavy (Ag, Br) nuclei of photoemulsion, have been sought; 4872 stops of antiprotons on photoemulsion nuclei are analysed. Events of formation and decay of the hyperfragment H-4(Lambda), escape of He-8 and Li-8 nuclei, one-prong stars with the mean range 79.5 +/- 5.1 mum of secondary slow "b" particles are found among the annihilation stars at (p) over tilde capture on nuclei (Ag, Br). The lower limits for the production probability H-4(Lambda) and He-8, Li-8 nuclei per antiproton stopping in the nuclei (Ag, Br) are W-Lambda(H)4 greater than or equal to 2 x 10(-4) and W-8He,W-8Li = (1.3 +/- 0.6) x 10(-3).(.) The branching ratio for the production of one-prong stars with the secondary "b" particles is at least (1.3 +/- 0.6) x 10(-3). Possible mechanisms for a production of these events in annihilation processes are considered.