The formation spectra of model KbarN and KbarNN systems formed by (K⁻,n) reactions are investigated in order to obtain a theoretical basis for a proper interpretation of experimental data concerning kaonic nuclear quasi-bound states. It has been clarified that the experimentally observable kaonic nuclear state K⁻pp should be regarded as the decaying state introduced by Kapur-Peierls, which is different from the pole state solution of the Faddeev equation.

(Contributed by Toshimitsu YAMAZAKI, M.J.A.)