Collective motion from various aspects |
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Authors: | E B Balbutsev |
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Institution: | (1) Joint Institute for Nuclear Research, 141980 Dubna, Moscow oblast, Russia |
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Abstract: | Three methods to describe collective motion, the Random Phase Approximation (RPA), Wigner Function Moments (WFM), and Green’s
Function (GF) methods, are compared in detail and their physical content analyzed in the example of a simple model, a harmonic
oscillator with quadrupole-quadrupole residual interaction. It is shown that they give identical formulae for eigenfrequencies
and transition probabilities of all collective excitations of the model. The exact relation between the RPA and WFM variables
and the respective dynamical equations is established. The transformation of the RPA spectrum into one of WFM is explained.
The very close connection of the WFM method with the GF method is demonstrated. A differential equation describing the current
lines of RPA modes is established and the current lines of the scissors mode are analyzed as a superposition of rotational
and irrotational components. The orthogonality of the spurious state to all physical states is proved rigorously.
The text was submitted by the author in English. |
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