Quantum Scattering of Distinguishable Bosons using an Ultracold Atom Collider

TL;DR

This paper presents a new magnetic collider setup to study ultracold atomic collisions, revealing detailed scattering phase shifts for different partial waves in rubidium atoms at microKelvin temperatures.

Contribution

It introduces an innovative magnetic collider method utilizing axial asymmetry to selectively prepare spin states and measure partial wave phase shifts in ultracold collisions.

Findings

Measured energy dependence of s, p, and d wave phase shifts.

Demonstrated selective preparation of spin states in a double-well magnetic trap.

Extended understanding of scattering processes at ultracold temperatures.

Abstract

We describe a new implementation of magnetic collider for investigating cold collisions between ultracold atomic clouds in different spin states, and we use this to investigate scattering involving both even and odd order partial waves. Our method relies on the axial assymetry of a double-well magnetic trap to selectively prepare the spin state in each cloud. We measure the energy dependence of s, p and d partial wave phase shifts in collisions up to 300 microKelvin between ^{87}Rb atoms in the 5S_{1/2}, F=1, m_F=-1 and 5S_{1/2}, F=2, m_F=1 states.