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• W2949205569 startingPage "165004" @default.
• W2949205569 abstract "More than 65 years ago, Jost and Kohn [R. Jost and W. Kohn, {Phys. Rev.} {bf 87}, 977 (1952)] derived an explicit expression for a class of short-range model potentials from a given effective range expansion with the $s$-wave scattering length $a_s$ being negative. For $a_s >0$, they calculated another class of short-range model potentials [R. Jost and W. Kohn, { Dan. Mat. Fys. Medd} {bf 27}, 1 (1953)] using a method based on an adaptation from Gelfand-Levitan theory [I. M. Gel'fand and B. M. Levitan, { Dokl. Akad. Nauk. USSR} {bf 77}, 557-560 (1951)] of inverse scattering. We here revisit the methods of Jost and Kohn in order to explore the possibility of modeling resonant finite-range interactions at low energy. We show that the Jost-Kohn potentials can account for zero-energy resonances. The $s$-wave phase shift for positive scattering length is expressed in an analytical form as a function of the binding energy of a bound state. We show that, for small binding energy, both the scattering length and the effective range are strongly influenced by the binding energy; and below a critical binding energy the effective range becomes negative provided the scattering length is large. As a consistency check, we carry out some simple calculations to show that Jost-Kohn potentials can reproduce the standard results of contact interaction in the limit of the effective range going to zero." @default.
• W2949205569 created "2019-06-27" @default.
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• W2949205569 date "2019-07-31" @default.
• W2949205569 modified "2023-09-27" @default.
• W2949205569 title "Modeling atom–atom interactions at low energy by Jost–Kohn potentials" @default.
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• W2949205569 doi "https://doi.org/10.1088/1361-6455/ab2378" @default.
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