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[en] The relation between the branch-point singularities of multichannel eigenamplitudes and the stability of the bound-state spectrum is examined. The important conclusion is that the spectrum is unstable in the neighborhood of the cross-over points. The formalism is applied to the S-wave anti p-atom bound states. (orig.)
Journal
Phys. Lett., B; ISSN 0370-2693; 
; v. 100(5); p. 371-375
; v. 100(5); p. 371-375