1 Efimov states
The Efimov states were initially proposed in 1970 as hypothetical, stable quantum states of
coupled three-body systems [1] such as three coupled bosons in ultracold ‘gedanken experiments’.
A most interesting feature of such ultracold 3-boson systems was the presence of an infinite
number of Efimov states when the boson coupling was weak but finite when the coupling became
strong.
Subsequently, in 2006, there have been published claims of experiments indicating the presence of
such “Efimov trimers” [2].(See also the following references.)
References
[1] Vitali Efimov. 1970. Energy levels arising from resonant two–body forces in a
three–body system, Physics Letters B, Volume 33, Issue 8 , 21 December 1970, Pages
563–564.
[2] T. Kraemer et al., 2006. Evidence for Efimov quantum states in an ultracold gas of
caesium atoms, Nature, 440, 315–318 (16 March 2006).
[3] E. Hadjimichael, S. N. Yang, G. E. Brown.,1972. A model for short range correlation
in the three–body system., Physics Letters B, Volume 39, Issue 5, 29 May 1972, Pages
594–598.
[4] M. V. Zhukov, B. V. Danilin, A. A. Korsheninnikov, L. V. Chulkov. 1992. Structure
of 6He nucleus as a three–body system: α–particle and neutron momentum distributions.
Nuclear Physics A, Volume 538, 2 March 1992, Pages 375–381.
[5] Y. Suzuki, Y. Fujiwara, W. Horiuchi, H. Matsumura.,2007. M. Dynamics of
macroscopic and microscopic three–body systems., Nuclear Physics A, Volume 790,
Issues 1–4, 15 June 2007, Pages 223c–228c.
