Abstract
In the framework of the long-mean-free-path approach the fluid-dynamical model of the nuclear surface as a spherical Fermi-layer is formulated. It is shown that the model reproduces known results of Fermi-drop dynamics and permits the description of more low energy collective states in spherical nuclei. The quantum-capillary branch of low-lying surface excitations is predicted. The model gives an adequate description of both lowest and highest experimental collective energies.
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References
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We warmly acknowledge several useful discussions with M. Durand, M. Di Toro, E.B. Balbutsev, I.N. Mikhailov, J. Bondorf, Ya.A. Smorodinsky, A. Kiss, F. Deak, S.N. Fedotkin, T. Stahl, V.M. Mikhailov, J. Wambach, S.A. Fayns, V.A. Khodel, S. Raman and I. Ragnarsson. We would like to thank Gy. Kluge and A.V. Tarakanov for their helpful assistance. One of the authors (S.I.B.) wishes to thank the Department of Atomic Physics, Roland Eötvös University Hungary for the warm hospitality extended to him during the period of this work.