Pairing reduction and rotational motion in multi-quasiparticle states

Calculations of pairing energies in multi-quasiparticle states using the Lipkin-Nogami prescription predict a discrete reduction in pairing with a geometric dependence on seniority. An abrupt transition from superfluid to normal motion is therefore not expected, even with a large number of orbits blocked. Recent experimental results on rotational bands associated with multi-quasiparticle intrinsic states allow comparisons to be made for a subset of orbitals as a function of seniority. Approximate agreement is obtained between the observed moments-of-inertia and calculated values supporting the view that for the highest seniority states identified so far, the pairing persists at nearly half of the full value. (C) 1998 Elsevier Science B.V.