Is there an Eta 3 He quasi-bound state?

Wilkin, C.; Schleichert, R.; Keshelashvili, I.; Wronska, A.; Dymov, S.; Täschner, A.; Hanhart, C.; Valdau, Yu.; Mikirtychiants, S.; Maeda, Y.; Khoukaz, A.; Papenbrock, M.; Ströher, H.; Kacharava, A.; Hejny, V.; Hartmann, M.; Chiladze, D.; Mersmann, T.; Rausmann, T.; Rathmann, F.; Mielke, M.; Büscher, M.

doi:10.1016/j.physletb.2007.08.041

Journal Article

Is there an Eta 3 He quasi-bound state?

Wilkin, C. ; Büscher, M.FZJ* ; Chiladze, D. ; Dymov, S. ; Hanhart, C.FZJ* ; Hartmann, M.FZJ* ; Hejny, V.FZJ* ; Kacharava, A. ; Keshelashvili, I. ; Khoukaz, A. ; Maeda, Y. ; Mersmann, T. ; Mielke, M. ; Mikirtychiants, S. ; Papenbrock, M. ; Rathmann, F.FZJ* ; Rausmann, T. ; Schleichert, R.FZJ* ; Ströher, H.FZJ* ; Täschner, A. ; Valdau, Y. ; Wronska, A.

2007
North-Holland Publ. Amsterdam

Physics letters / B 654, 92 - 96 (2007) [10.1016/j.physletb.2007.08.041]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10506 doi:10.1016/j.physletb.2007.08.041

Abstract: The observed variation of the total cross section for the dp -> He-3 eta reaction near threshold means that the magnitude of the s-wave amplitude falls very rapidly with the eta centre-of-mass momentum. It is shown here that recent measurements of the momentum dependence of the angular distribution imply a strong variation also in the phase of this amplitude. Such a behaviour is that expected from a quasi-bound or virtual eta He-3 state. The interpretation can be investigated further through measurements of the deuteron or proton analysing powers and/or spin-correlations. (C) 2007 Elsevier B.V. All rights reserved.

Keyword(s): p deuteron: exclusive reaction ; eta: hadroproduction ; helium: nuclide ; threshold ; channel cross section: energy dependence ; angular distribution ; momentum dependence ; partial wave ; scattering amplitude: pole ; bound state: (light nucleus eta) ; numerical calculations ; interpretation of experiments: Juelich COSY PS ; deuteron p --> helium-3 eta ; eta production (auto) ; quasi-bound states (auto)