On the free rotation of a molecule embedded in helium-4 clusters

The fact, that 4He atoms on different concentric circular paths around the axis of a quantum vortex move with identically equal angular momentum, which represents an important aspect of superfluidity of He-II, has been used to discover a model which can explain the typical nature of experimentally observed N (number of 4He atoms) depen-dence of the rotational constant (B) of the rotor part of a cluster M:HeN. It reveals how exactly superfluidity is related to the said dependence of B on N. We believe that this model, when used with simulation techniques, would render results that would agree closely with experiments