Heidelberg 2015 – wissenschaftliches Programm

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SYEP: Symposium Efimov Physics

SYEP 1: Symposium Efimov Physics I

SYEP 1.2: Hauptvortrag

Montag, 23. März 2015, 12:00–12:30, C/gHS

Universality in halo nuclei — •Daniel Phillips — Institute of Nuclear and Particle Physics and Department of Physics and Astronomy, Ohio University, Athens, OH 45701, USA

In the limit of a large two-body s-wave scattering length the properties of quantum-mechanical few-body systems become insensitive to details of the two-body potential. This leads to the emergence of universality: relations between different observables which rely for their validity only on the presence of a sizable scattering length. These relations apply across a wide range of scales: to hadrons, light nuclei, clusters of atoms, and to cold atomic gases with tunable interactions. The Efimov effect is one example of a universal phenomenon, but many other universal correlations also exist.

In this talk I will show that this type of universality provides an organizing principle for the physics of halo nuclei. These are systems in which a few nucleons are weakly bound to a nuclear core. They can thus be treated in a "clustered" description in which the core and the "halo" nucleons are the degrees of freedom. Since the halo nucleons are weakly bound universal correlations between observables exist. This unifies the physics of a diverse set of halo nuclei.

I will also discuss the ways in which details of nuclear interactions refine, but do not destroy, a universal description. Applications to the possibility of Efimov states in halo nuclei, as well as results for observables in halo systems where the unitary limit is close to being realized, will be displayed.