Abstract
The deviations from I(I+1) rule for K=0 rotational bands are generally explained by writing a phenomenological expression with a power series in I(I+1). For K not=0 bands the rotation-particle coupling (RPC or Coriolis) term in the Hamiltonian introduces an additional series which alternates in sign with level spin. The leading term of this alternating series for K=1/2 rotational bands can be said to arise from the third order RPC perturbation effects of K=1/2 states. These third order Coriolis perturbation effects are calculated for the 3/2-(512) based band in 183W, by considering the mixing of all the possible Kpi =1/2- states in the same oscillator shell. The matrix elements are calculated using the modified Nilsson model potential. The effect of the deformed spin-orbit coupling term is also investigated. The calculated coefficient is compared with its 'experimental' value and the comparison is used to discuss the characterization of the non-adiabatic corrections.
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