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Optical properties of a Bose condensate of N₂ atoms tightly confined to a harmonic oscillator potential are studied. A resonantly illuminated condensate scatters as much light as x independent atoms, where x depends on the size of the condensate and on the wavelength of light but not on N₂; the linewidth of the resonance is N₂/x times larger than the linewidth of an individual constituent atom. If the condensate is bigger than a wavelength, light is predominantly scattered in the forward direction.
Juha Javanainen (Mon,) studied this question.