Isovector energy-weighted sums for hot nuclei in presence of relaxation processes
Abstract
We investigate the collective response function and the energy-weighted sums mk for isovector mode in hot nuclei. The approach is based on the collisional kinetic theory and takes into consideration the temperature and the relaxation effects. Taking into account a connection between the isovector sound mode and the corresponding surface vibrations we have established the A-dependence of the enhancement factor for the isovector sum rule in a good agreement with experimental data. We have shown that the enhancement factor for the "model independent" sum m1 is only slightly sensitive to the temperature change.
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