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SYLB: Symposium Loosely-Bound States – From the Coldest to the Hottest Environments

SYLB 1: Loosely-Bound States – From the Coldest to the Hottest Environments

SYLB 1.2: Invited Talk

Monday, September 8, 2025, 11:25–12:05, ZHG104

The structure of loosely-bound nuclear states: when the tail wags the dog — •Hans-Werner Hammer — Technische Universität Darmstadt, Department of Physics, Institut für Kernphysik, 64289 Darmstadt, Germany

Loosely-bound quantum states with very different interactions at short distances can show universal behavior at large distances. These states are in the extreme quantum regime, as their constituents spend most of the time outside of the range of their interaction and the tail of the wave function determines many of their properties. They can have the peculiar property that removing one particle from a multi-body bound state can cause the whole bound state to fall apart. Such systems can be found over a large range of scales ranging from nuclear and particle physics to ultracold atoms. The talk will give an overview of current research questions and future challenges with a particular focus on nuclear systems.

Keywords: universality; shallow bound states; nuclear physics; Borromean systems; Efimov effect