Nuclei at High Angular Momentum

Triaxial nuclear shapes at high angular momentum

Shape is a fundamental property of atomic nuclei. The spherical ground-state equilibrium shapes of closed-shell ‘‘magic’’ nuclei give way to deformed, usually prolate shapes in the midshell regions. Although a variety of shapes may be found for excited nuclear states, the propensity for axial symmetry appears to be pervasive. Yet, there is a lack of suitable observables that are able to indicat...

Light-particle Emission at High Angular Momentum

Multiphonon vibrations at high angular momentum in 182 Os.

Evidence is presented for multiphonon excitations based on a high-spin (25 Planck) intrinsic state in the deformed nucleus 182 Os. Angular momentum generation by this mode competes with collective rotation. The experimental data are compared with tilted-axis cranking calculations, supporting the vibrational interpretation. However, the lower experimental energies provide evidence that more comp...

Angular and momentum asymmetry in particle production at high energies

Angular asymmetry and momentum disbalance for a pair of particles produced at high energy in central rapidity region are studied. The asymmetry is substantial for small momenta of produced particles but diminishes when they rise.

58Ni: an unpaired band crossing at new heights of angular momentum for rotating nuclei.

High-spin states in 58Ni have been investigated by means of the fusion-evaporation reaction 28Si(32S, 2p)58Ni at 130 MeV beam energy. Discrete-energy levels are observed in 58Ni at record-breaking 42 MeV excitation energy and angular momenta in excess of 30h. The states form regular rotational bands with unprecedented high rotational frequencies. A comparison with configuration dependent cranke...