Recoilless and resonant production of double-pion atoms

We exploit two ideas found successful in the direct production of pionic atoms: Recoilless condition and resonance production, in order to produce atomic systems with two bound π-. As an example of recoilless reaction we study π-+AX→p(A-1X, π-, π-), and as an example of resonant reaction we study π-X→(π-π-X')→π-X. In both cases the signals are found to be only a small fraction of the background indicating the big experimental difficulties that one is facing in producting these states. (orig.)