[en] The developments of the two years in the area of pion-nucleus reactions at low and medium energies are reviewed. Primary attention is given to the processes (π,π'N), (π, 2N), (π,γ) and (γ,π), (p, π) and (π, p), and π + A → A' + [π' .] + nuclear aggregates

[en] The current status of pion-nucleus interactions is reviewed with an emphasis on recent experimental results. (orig.)

[en] This document reports the progress of the research of pion reactions. These include (1) a study to measure observables in the pion-nucleon system in the momentum interval 400 to 700 MeV/c, (2) differential cross section measurements at low energy for pion-nucleon charge exchange, and (3) elastic and inelastic scattering of π^+- on ³H and ³He. Individual experiments will be indexed separately

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[en] A theoretical model based on the assumption that the spontaneous pion emission from the ground state of a nucleus can be described as a fission like process is proposed. Then, the nuclear instability with respect to the spontaneous pion emission is discussed in terms of the π^- fissionability parameter. Analytical results for the π - fission barrier and the spontaneous π - fission half-lives are derived from those of the usual fission using the substitution: x → xsub(πF), Z²/A → (Z²/A)sub(πF). Absolute predictions for GAMMA sub(π)/GAMMAsub(SF) are presented. (authors)

[en] The experiments about pion production and pion absorption at rest or in fly recently performed in Europ are presented. It is shown that to understand the data some reaction's mechanism more complex than the one nucleon mechanism must be introduced and it is concluded that important and exciting experimental work is still necessary

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