An approximation for rotation-projected expectation values of the energy for deformed nuclei and a derivation of the cranking variational equation
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An approximation is given for the expectation value of the Hamiltonian with functions: where ¦ϕ〉 is a HFB wave function of a deformed nucleus. This is achieved by expanding the overlap function of the energy 〈ϕ¦ HD(Ω)¦ϕ〉 in derivatives of the overlap function of the norm 〈ϕ D(Ω)¦ϕ〉. The cranking equations for even nuclei are yielded by varying the approximate energy.