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arXiv · 1311.3775

Pure Collective Precession Motion of High-Spin Torus Isomer

T. Ichikawa·K. Matsuyanagi·J. A. Maruhn·N. Itagaki
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Abstract

We investigate the precession motion of the exotic torus configuration in high-spin excited states of $^{40}$Ca. For this aim, we use the three-dimensional time-dependent Hartree-Fock (TDHF) method. Although the high-spin torus isomer is a unique quantum object characterized by the alignment of angular momenta of independent single-particle motions, we find that the obtained moment of inertia for rotations about an axis perpendicular to the symmetry axis is close to the rigid-body value. We also analyze the microscopic structure of the precession motion using the random-phase approximation (RPA) method for high-spin states. In the RPA calculation, the precession motion of the torus isomer is generated by coherent superposition of many one-particle-one-hole excitations across the sloping Fermi surface that strongly violates the time-reversal symmetry. By comparing results of the TDHF and the RPA calculations, we find that the precession motion obtained by the TDHF calculation is a pure collective motion well decoupled from other collective modes.

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T. Ichikawa, K. Matsuyanagi, J. A. Maruhn, N. Itagaki. 2013-11-15. Pure Collective Precession Motion of High-Spin Torus Isomer. https://doi.org/10.1103/physrevc.89.011305

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