Antiproton Annihilation in Nuclear Matter: Multipion-Nucleus Interactions and Exotic Phenomena
The study of the process of Nuclear absorption of antiprotons allows to obtain informations on different annihilation mechanisms. In particular, when the p̄ annihilation occurs on the surface of the nuclei (annihilation at rest) and several pions simultaneously enter a nucleus, the pions can interact with the nucleus independently of one another (incoherent multipion-nucleus interaction). On the other hand, it is also possible that the pion resonance states generated in the annihilation processes (η and ω mesons) are absorbed by the nucleus, with emission of two fast correlated nucleons1. In the case of annihilation in flight, when the p̄ annihilation occurs deeply into a heavy nucleus, a very “hot spot” develops and it can be expected that there exists a probability of about 1% of annihilation with creation of quark-gluon plasma2. These events have the aspect of stars with high nucleón multiplicity (10÷20 prongs).
KeywordsNuclear Matter Residual Nucleus Recoil Nucleus Nucleon Pair Nuclear Absorption
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