Abstract
The elementary excitations of4He clusters containingN atoms are investigated by solving the equations of the random phase approximation (RPA) with a phenomenological effective interaction. The calculations were done for 40≦N≦728. The effects of the RPA correlations are explicitly discussed. Important deviations from the predictions of the liquid droplet model (LDM) are found up toN⋍500 for the “breathing” compression mode and up toN⋍100 for surface excitations. Sum rules for compression and surface excitations are also derived and discussed.
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Casas, M., Stringari, S. Elementary excitations of4He clusters. J Low Temp Phys 79, 135–149 (1990). https://doi.org/10.1007/BF00692450
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DOI: https://doi.org/10.1007/BF00692450