Gießen 2007 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 6: Theorie

HK 6.2: Talk

Monday, March 12, 2007, 18:15–18:30, C

Helium 6 in an Effective Theory Framework — •David Canham and Hans-Werner Hammer — Helmholtz-Institut für Strahlen- und Kernphysik (Theorie), Universität Bonn, 53115 Bonn, Germany

The ⁶He nucleus is a 3-body Borromean halo nucleus. This makes it a promising system for studies based on effective field theory. We develop an effective theory in the framework of the Faddeev equations for 3-body bound states. As a first approximation, we have explored the resonant interaction of the two nα subsystems in the P_3/2 wave as the only contributing interaction. Both the P-wave scattering volume and effective range enter at leading order in the 2-body subsystem. Our first results indicate a strong cutoff dependence of the 3-body binding energy reminiscent of the Efimov effect.