AWhat changed
Pereira Dos Santos and colleagues observed a condensate of metastable helium-4 atoms in a magnetic trap using absorption imaging after release. Its bimodal distribution and changing expansion anisotropy supported condensation. They estimated the scattering length and reported roughly two-second condensate decay.
Scientific scope
Pereira Dos Santos and colleagues observed a condensate of metastable helium-4 atoms in a magnetic trap using absorption imaging after release. Its bimodal distribution and changing expansion anisotropy supported condensation. They estimated the scattering length and reported roughly two-second condensate decay. This was a dilute excited-state gas, distinct from liquid superfluid helium and earlier alkali and hydrogen gas condensates. Atom-number calibration and inferred scattering length have large uncertainties; the authors could not distinguish two-body from three-body losses and gave upper bounds under separate assumptions. The manuscript credits an independent Orsay observation made with a different detection method. The arXiv v1 quoted collision rate differs from the later journal abstract; no version equivalence is assumed.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. This was a dilute excited-state gas, distinct from liquid superfluid helium and earlier alkali and hydrogen gas condensates. Atom-number calibration and inferred scattering length have large uncertainties; the authors could not distinguish two-body from three-body losses and gave upper bounds under separate assumptions. The manuscript credits an independent Orsay observation made with a different detection method. The arXiv v1 quoted collision rate differs from the later journal abstract; no version equivalence is assumed.
Contributors
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