Abstract
The theory of nuclear rotational spectra is reformulated in terms of generalized Green functions. Using projected wave functions, a reduction procedure for three-dimensional rotational matrix elements is derived, taking into account the change of the intrinsic nuclear density distribution due to rotation. In first order the reduced equation of motion corresponds to cranking Green functions; higher order corrections are obtained. The determination of the collective energy spectrum is discussed, and a compact expression for multipole transition elements is derived in terms of the reduced density matrix.
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