FIG. 10: (Color online) ISGDR strength distributions obtained for the Sn isotopes in the present experiment. Error bars represent the uncertainties from fitting the angular distributions in the MDA procedure. The solid lines show Lorentzian fits to the data. Fig. 9; the corresponding fitting parameters are presented in Table III and compared with results from TAMU [19, 21]. In this and subsequent comparisons and discussion, we refer only to the recent TAMU results because those are from comparable data and analysis—all other previous results on the Sn isotopes were from peak-fitting analyses of data taken at significantly lower energies. In order to compare with the available theoretical results, various moment ratios for the experimental ISGMR strength distributions have been calculated over the excitation-energy range, E$_{x}$ = 10.5–20.5 MeV, encompassing the ISGMR peak. The results are listed in Table IV. The reasons for the difference between the present results and those from TAMU for $^{112}$Sn and $^{124}$Sn are not readily apparent but might be attributable to the fact that in their analysis the multipole decomposition is carried out after subtracting a “background” from the excitation-energy spectrum, whereas, as pointed out earlier, no such subtraction is required in the present analysis since the Sn( α, α $^{′}$) spectra obtained in our work have been rendered free of all instrumental background events. 14