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£á¡Ëabstract

     The effects of the rotation-alignment of a pair of
neutrons on the signature splitting of the energy levels
in 157Ho are investigated in the framework of a
proton-neutron-triaxial-rotor model. We included
many-quasi-particle configurations and highly-excited ¦Ã-
bands in our model space. We confirmed that the employed
model space is large enough that the calculated signs of
the signature splittings are reliable. Some earlier
results obtained by other authors are verified in our
larger- model-space calculations.  It is shown that the
effects of the coupling with highly excited ¦Ã-bands (K
¡æ4) are not negligible. When we include only the lowest
(K=2) ¦Ã-band and assume the reversed (compared to the
irrotational flow model) ¦Ã-dependence of the moment of
inertia, the signature dependence is inverted in the
spin region just after the first backbending.  But when
we include higher-lying ¦Ã-bands, we find that the
normal signature splitting is recovered for all spin
values.

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