Giant resonances as collective states with dissipative coupling
Eliade N. Stefanescu, R. J. Liotta, A. Sãndulescu · Physical Review C · 1998
We describe giant resonances as the collective coordinates of a harmonic oscillator with dissipative coupling. Using a quantum master equation, the energy and width of the first two levels are obtained as functions of temperature and of the dissipative coupling strength. On this basis, we evaluate the ratio of the two spectral linewidths. The result agrees with available experimental data. We evaluate transition matrix elements among particle excitations belonging to the environment and find a weak dependence on temperature.