Bose 2.2 User Manual download pdf (Page 120)

in Ref. [205], our new setup may be suited to directly image the various partial waves at

selectable collision energies: making use of the tunable trapping potentials, two ultracold

thermal clouds

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can be accelerated towards each other to collide at a well controlled

relative velocity. The elastically scattered atoms, imaged after time-of-ﬂight, are expected

to form density patterns of particular symmetries that directly reﬂect the symmetries of

the partial waves involved in the scattering process.

Regarding the experiments with dysprosium BECs, the

-wave scattering lengths of the

bosonic isotopes

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Dy and

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Dy in the zero-temperature limit are yet undetermined.

Here, due to the anisotropic two-body interaction potentials, many Feshbach resonances

are expected to occur for magnetic ﬁeld strengths up to 200 Gauss [206]. Measuring the

positions and the widths of these resonances will give further insight into the scattering

properties of dysprosium and set the basis to control the contact interactions in the

system.

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For bosons, the temperature of the clouds should be chosen just above condensation temperature.

Finite temperature eﬀects are thus minimized and interference eﬀects (as observed for BECs) can be

avoided.

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Bose 2.2 User Manual Page 120