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VOLUME 34 (1981) | ISSUE 5 | PAGE 292
Coulomb systems with a short-range interaction: the Σ-p atom and resonant levels of light nuclei
An equation relating the shift and width of atomic levels to the strong scattering length, which was derived previously {T. L. Trueman, Nucl. Phys. 26, 57 (1961); A. E. Kudryavtsev and V. S. Popov, Pis'ma Zh. Eksp. Teor. Fiz. 29, 311 (1979) [JETP Lett. 29, 280 (1979)]; V. S. Popov, A. E. Kudryavtsev, and V. D. Mir, Zh. Eksp. Teor. Fiz. 77, 1727 (1979) [Sov. Phys. JETP 50, 865 (1979)]), is generalized to the case of complex momenta к and arbitrary values of the angular momentum / and of ξ — — Z,Z2. The shift and width of the s levels of the Σ ρ atom are calculated. The relationship between the position and width of the resonances in the case of Coulomb repulsion is studied.