The IUCF measurements of the reaction pp->pp pi0 enabled to make a substantial progress in the theoretical description of the pion production. Two-pion production is a natural extension of these studies, allowing to gain further information about the reaction mechanism. It can also deliver interesting information about interaction between the reaction products in the final state. For example in the reaction pp->nn pi+pi+ we expect to observe the influence of the neutron-neutron final state interaction on the energy dependence of the total cross section.
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