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We generalize here the one-level consideration in our recent paperarXiv:1901.00411 [1] to the case when an electron collides with a potentialthat have any number of s bound states. We investigate peculiarities in theWigner time delay behavior for slow electron elastic s-scattering byspherically symmetric square-potential well. We have considered potentialwells, the variation of parameters of which (potential depth U and its radiusR) lead to arising arbitrary number of s bound states. We demonstrate thatwhile the time delay for potential wells with no discrete s-levels always has apositive value for small electron energies, it changes sign after levelarising. We found that at the moments of arising in the well not only of thefirst but also following s-levels as well, the time delay as a function of Uexperiences instant jumps from a positive value to a negative one. Theamplitudes of these jumps increases with decrease of the electron wave vectork. The times delay for potential well, the variation of the radius of which Rleads to the appearance of discrete levels, also change sign at these criticalradii.

Peculiarities of Wigner times delay in slow elastic electron scattering by potential well with arising discrete levels