Level rearrangement in three-body systems

Abstract : We study systems of three bosons bound by a long-range interaction supplemented by a short-range potential of variable strength. This generalizes the usual two-body exotic atoms where the Coulomb interaction is modified by nuclear forces at short distances. The energy shift due to the short-range part of the interaction combines two-body terms similar to the ones entering the Trueman-Deser formula, and three-body contributions. A phenomenon of level rearrangement is observed, similar to the Zel'dovich effect, by the onset of an additional stable level which is eventually absorbed by the two-body threshold energy, and can be interpreted as an Efimov-like state of the short-range potential.
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Submitted on : Friday, September 30, 2016 - 7:21:25 AM
Last modification on : Wednesday, October 30, 2019 - 1:41:46 AM

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J.-M. Richard, C. Fayard. Level rearrangement in three-body systems. Physics Letters A, Elsevier, 2017, 381, pp.3217-3221. ⟨10.1016/j.physleta.2017.08.021⟩. ⟨in2p3-01374204⟩

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