- Conference date: 19–20 March 2007
- Location: Aarhus (Denmark)
Feshbach resonances are quasi‐bound states that are represented, in first approximation, as bound states in energetically closed channels. Owing to coupling with open channels they can spontaneously break up into two or more fragments. I will review those states that separate into two fragments within the framework of multichannel effective range theory. Magnetic tuning of scattering lengths is described within this context. Such tuning has opened up many opportunities for fundamental studies of few‐body systems. By using multichannel zero‐range potentials, conventionally called pseudo‐potentials, it is possible to employ the model when the few‐body systems involve three or more fragments. The emergence of Efimov states for critical values of the tuning parameters is discussed.
- Bound states
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