Analysis of fragmented GQR in the 24Mg nucleus

The fragments of the isdoscalar giant quadrupole resonance (GQR) found in (α,α') reaction in the 24Mg nucleus were analyzed by two different methods. These methods permit to determine the position, the spreading width and the strength of the simple structure state mixed into the the neighbouring more complicated states by the coupling interaction. In this way the parameters of the GQR were determined; the position Esub(x)=18.1 MeV, the spreading width μ=3.0 MeV and a strength of 75% of the energy weighted sum rule (EWSR) were obtained, in good agreement with both of the methods. The analysis of different reactions exciting the same energy region of the 24Mg nucleus made it possible to compare them and helped to clarify the question of the correlation between the different channels. (author)