FIG. 11: (Color online) ISGQR 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. Figure 10 shows the strength distributions of ISGDR. We observe a “bi-modal” distri- bution between E$_{x}$ =8.5 MeV and E$_{x}$ =31.5 MeV. This bi-modal pattern for the ISGDR has been observed in all nuclei investigated so far, both in the RCNP and TAMU mea- surements. This “low-energy” isoscalar L =1 strength (LE) has engendered considerable interest and argument over the past few years. It is present in nearly all of the recent theoretical calculations in some form or the other, and at similar energies, although with varying strength. It has been shown [59, 60] that the centroid of this component of the L =1 strength is independent of the nuclear incompressibility and while the exact nature of this component is not fully understood yet, suggestions have been extended to the effect that this component might represent the “toroidal” [60, 61] or the “vortex” modes [62]. It is impossible to distinguish between the competing possibilities based on currently-available data [31]. There is general agreement, however, that only the high-energy (HE) component of this bi-modal distribution needs to be considered in obtaining a value of K$_{∞}$ from the energy of the ISGDR. The strength distributions of the ISGDR, therefore, have been fitted 15