The basic role of open systems in attaining Bose condensation in spin-polarized atomic hydrogen gas
Kagan Yu., Shlyapnikov G. V., Glukhov N. A.
The impossibility of attaining Bose condensation in a closed system because of the Kapitsa jump at the gas (atomic hydrogen)-liquid helium boundary can be overcome in open systems with a single "magnetic wall" which can be cooled by releasing excited molecules and fast atoms.