Abstract
Several years ago it was discovered that light can lower the homogeneous nucleation temperature of superheated liquid helium I. We report here on experiments involving the same homogeneous nucleation limit, reached now by acoustically reducing the pressure rather than by raising the temperature. It is found that in our present experimental setup the presence of light does not have any influence on the homogeneous nucleation limit. Thus, it seems that the presence of a solid surface in contact with the helium, such as the heater-thermometer surface in the superheating experiments, is important for observing the light effect.
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