Abstract
We report a measurement of the suppression of collisions of quasiparticles with ground state atoms within a Bose-Einstein condensate at low momentum. These collisions correspond to Beliaev damping of the excitations, in the previously unexplored regime of the continuous quasiparticle energy spectrum. We use a hydrodynamic simulation of the expansion dynamics, with the Beliaev damping cross section, in order to confirm the assumptions of our analysis.
Original language | American English |
---|---|
Journal | Physical Review Letters |
Volume | 89 |
Issue number | 22 |
DOIs | |
State | Published - 2002 |
Externally published | Yes |