Abstract
Members of the ground state rotational bands in the doubly even well-deformed nucleides 158Dy, 160Dy, 162Er and 168Yb are populated in ( α, x n) reactions and the variation of the moments of inertia with the rotational angular velocity is investigated. In three of these nucleides abrupt changes in the moment of inertia are observed at high rotational frequencies. This may be interpreted as a phase transition from the superfluid state to a non-superfluid state with no pairing due to the Mottelson-Valatin Coriolis antipairing effect.
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