Friday, February 3, 2012

1202.0167 (A. Deltuva)

Properties of universal bosonic tetramers    [PDF]

A. Deltuva
The system of four identical bosons is studied using momentum-space equations
for the four-particle transition operators. Positions, widths and existence
limits of universal unstable tetramers are determined with high accuracy. Their
effect on the atom-trimer and dimer-dimer scattering observables is discussed.
We show that a universal shallow tetramer intersects the atom-trimer threshold
twice leading to resonant effects in ultracold atom-trimer collisions.
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