Examination of evidence for resonances at high excitation energy in the 7α disassembly of Si 28

The experimental excitation function for the 7α de-excitation of Si28 nuclei excited to high excitation energies in the collisions of 35 MeV/nucleon Si28 with C12 reveals resonance structures. The possibility that these structures may indicate the population of toroidal high-spin isomers such as those predicted by a number of recent theoretical calculations is discussed and the need for further investigations is emphasized.