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Angular momentum effects in the pi -nn bound-state problem.

The possible existence of stable bound states of two neutrons and a negative pion is investigated in all three-body channels with angular momentum J< or =2, by solving the relativistic Faddeev equations at threshold with all the S- and P-wave pion-nucleon channels and all the S-, P-, and D-wave nucleon-nucleon channels as input. It is shown that the most likely configuration to have in a bound state is that with angular momentum and parity quantum numbers J/sup P/ = 2/sup +/.