74 citations · 645 across the 66 of their papers we have counts for
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The a priori tanθtheorem for eigenvectors
Sergio Albeverio, Alexander K. Motovilov, Alexei V. Selin
Let be a self-adjoint operator on a Hilbert space $\fH$. Assume that the spectrum of consists of two disjoint components and such that the convex hull of the se…
Scattering length for helium atom-diatom collision
Elena A. Kolganova, Alexander K. Motovilov, Werner Sandhas
We present results on the scattering lengths of ^4He--^4He_2 and ^3He--^4He_2 collisions. We also study the consequence of varying the coupling constant of the atom-atom interactio…
Explicit Representations for the T-Matrix on Unphysical Energy Sheets and Resonances in Two- and Three-Body Systems
Alexander K. Motovilov
We discuss the structure of the two- and three-body T-matrices, scattering matrices, and resolvents continued to the unphysical energy sheets. Our conclusions arise due to the repr…