Geodesic
Model of a zero-range potential with internal structure
Teoretičeskaâ i matematičeskaâ fizika, Tome 59 (1984) no. 3, pp. 345-353 
B. S. Pavlov. Model of a zero-range potential with internal structure. Teoretičeskaâ i matematičeskaâ fizika, Tome 59 (1984) no. 3, pp. 345-353. http://geodesic.mathdoc.fr/item/TMF_1984_59_3_a1/
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     author = {B. S. Pavlov},
     title = {Model of a zero-range potential with internal structure},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {345--353},
     year = {1984},
     volume = {59},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1984_59_3_a1/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

A zero-range potential with internal structure is constructed using the methods of the theory of extensions from the space $L_2(\mathbb R^3)$ to the larger Hilbert space $L_2(\mathbb R^3)\oplus H$. A spectral analysis of a Schrödinger operator with such a potential is made; the S matrix is investigated and shown to be nontrivial in the $s$ channel; and the eigenvalues and resonances are calculated for small coupling constants.

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