Abstract
We analyze the change in the hyperradial Efimovian three-body potential as the two-body interaction is tuned from the broad to narrow Feshbach resonance regime. Here, it is known from both theory and experiment that the three-body dissociation scattering length shifts away from the universal value of , with the two-body van der Waals range. We model the three-body system using a separable two-body interaction that takes into account the full zero-energy behavior of the multichannel wave function. We find that the short-range repulsive barrier in the three-body potential characteristic for single-channel models remains universal for narrow resonances, while the change in the three-body parameter originates from a strong decrease in the potential depth. From an analysis of the underlying spin structure we further attribute this behavior to the dominance of the two-body interaction in the resonant channel compared to other nonresonant interactions.
4 More- Received 25 October 2022
- Accepted 20 January 2023
- Corrected 14 February 2023
DOI:https://doi.org/10.1103/PhysRevA.107.023301
©2023 American Physical Society
Physics Subject Headings (PhySH)
Corrections
14 February 2023
Correction: A typographical error introduced during the production process involving the characters inside angular brackets in Eqs. (10) and (14) and in various locations in text has been fixed.