Simulation of antiproton-nuclear annihilation at rest

Simulation of antiproton-proton, pion-nuclear and photo-nuclear reactions with CHIPS is published and implemented in GEANT4. In CHIPS the hadronic compounds (quasmons) are created by projectiles on nuclear clusters with subsequent hadronization of the quasmons in vacuum (quark fusion) or in nuclear matter (quark exchange). The antiproton-nuclear reactions at rest are simulated in two steps: first, antinucleons annihilate with the peripheral nucleons which are relatively far from the dense nuclear surface, second, a part of the secondary mesons interact with the residual nucleus. The solid angle in which the secondary mesons are absorbed by nuclei is a parameter. The second step is the parallel hadronization of a set of quasmons, created by the absorbed mesons, inside the same nucleus. The multi-quasmon fragmentation algorithm of CHIPS is well tested now. The result of simulation is compared with experimental data. CHIPS can simulate yields of charged nuclear fragments, which are locally absorbed by matter and can damage electronics and carbonize scintillator, initializing plastic cancer. The antiproton therapy is compared with the photon, proton, ion, and pion therapy.