Rotation-induced transition from superfluid to normal phase in mesoscopic systems:Yb168and adjacent nuclei

Abstract
The transition from strong static pairing to weak static pairing and its consequences to the excitation spectrum of a mesoscopic (medium number of particles) system are investigated. New levels have been measured in Yb168. A reasonable description of the A≊168 isotopes spectra is obtained. The adequacy of the phase transition concept is discussed.