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Starting with a model for odd-odd nuclei, which had been used in former investigation (rigid, symmetrical top for the deformed even-even core, two extra particles in a Nilsson potential), the influence of the coupling term H c  and of the residual interaction V PN  on the rotational spectrum of the odd-odd nucleus  166 Ho are discussed. It is shown, that in this nucleus neither the coupling term H c  nor a pure Wigner force can explain the characteristic features of the rotational spectrum. It is therefore necessary to introduce a residual interaction V PN , which contains at least a spin-spin term. The explicit calculation for the nucleus  166 Ho with a simple ansatz (δ-interaction with spin-spin term) already leads to a qualitative explanation of the particularities in the observed rotational spectrum. The investigations show a way how to get more information about the protonneutron interaction in odd-odd nuclei

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Der Einfluß der Restwechselwirkung V PN  auf das Rotationsspektrum des u-u-Kerns  166 Ho / The influence of the residual interaction fpu on the rotational spectrum of the odd-odd nucleus  166 ho