Resonant modes in light nuclei

C. Bahri, Louisiana State University
J. P. Draayer, Louisiana State University
O. Castaños, Universidad Nacional Autónoma de México
G. Rosensteel, Tulane University


The microscopic character of the giant quadrupole resonance in light, deformed nuclei is explored within the context of the contracted sympletic model. Some results are given for 24Mg. A simple parameter, the quadrupole-quadrupole interaction strength, suffices to fix the location of the resonance, the strength of low-lying as well as high-lying 2+→Og+ transitions, and the groundband deformation. The resonance is found to be a highly coherent excitation that spans more than a dozen major shells of the oscillator. Additionally, the results show that the giant resonance is just one manifestation of the existence of a strongly deformed band (βr≈1.5βg) in the continuum that mirrors the low-lying rotational structure. © 1990.