OVERLAPPING RESONANCES IN THE BETA-PARAMETER SPECTRUM

Symmetry reversals and fluctuations of both width and intensity have s o far been regarded as characteristic of interacting resonances in pho toabsorption spectroscopy. It is demonstrated for the first time that they can also appear in the beta-parameter spectrum, which then become s generally different in appearance from the corresponding photoioniza tion spectrum. Indeed, not only the location of the symmetry reversals , but even their number within a series differ between both spectra, a nd intensity fluctuations present in one spectrum can be absent from t he other. Our study is performed within the 'spin-polarized' random-ph ase approximation with exchange.