Moments of inertia for multiquasiparticle configurations

Abstract

Tilted-axis cranking calculations have been performed for multi-quasiparticle states in well deformed A≈180 nuclei. In the limit of zero pairing, not only are the calculated moments of inertia substantially smaller than for rigid rotation, but also they are close to the experimental values. The moments of inertia are found to be insensitive to dynamic pair correlations.

Gross shell structure at high spin in heavy nuclei

“…This observation is corroborated by self-consistent cranking calculations that assume zero pairing (see e. g. [2,3,4]), which find strong deviations from J rig in accordance with experiment. Nevertheless, the question of long standing interest in nuclear physics, how is angular momentum generated in nuclei,…”

Static Quadrupole Moment of the Five-QuasiparticleK=352Isomer inW1

“…The importance of this question is related to the question of the quenching of the pairing correlations in atomic nuclei. The usual approach is by studying the rotational bands, which are built on the K isomer, to deduce the moment of inertia and compare it to that of the ground-state (fully paired) rotational band [5]. Yet, the moment of inertia depends on both the deformation and the pairing, which requires that the deformation be determined experimentally.…”

High-spin isomers: structure and applications

“…1. Compared to the rigid-body value, the moment of inertia of the K = 30 band is reduced by about one third, and tilted-axis-cranking (TAC) calculations [9] show that this reduction is compatible with completely quenched pairing effects (although dynamical pairing correlations remain [10]). It should be added that the selection of this K = 30 band is judiciously based on its configuration, and the lack of high-j, low-Ω quasiparticles, which can align their angular momentum with the collective rotation and considerably complicate the situation.…”