TABLE V: Lorentzian-fit parameters for the low-energy component of ISGDR strength distribu- tions in the Sn isotopes  as extracted from MDA. The results from TAMU work  where available  are provided for comparison [19  21]. with neutron excess predicted by this hybrid model might be unrealistic. They also suggest that the failure of the FSUGold to reproduce the ISGMR energies might be due to missing physics unrelated to the incompressibility of neutron-rich nuclear matter; as an example of such missing physics  they mention the superfluid character of the Sn isotopes resulting from their open-shell structure. Calculations have also become available recently from the RMF approach with the DD- ME2 interaction [75]  and these reproduce the centroids of the ISGMR in the Sn isotopes rather well [68]. It is also seen that the DD-ME2 interaction falls within the constraints imposed by the experimental K$_{∞}$ and K$_{τ}$ values (see discussion below). Some concern has been expressed  however  that this agreement of the centroid energies might be just a coincidence since the ISGMR strength distributions for the Sn isotopes from this work appear to be not significantly different from those obtained from  for example  the FSUGold [76]. In calculations using the T5 Skyrme interaction within the quasiparticle time blocking approximation (QTBA) approach  Tselyaev et al. [69] have obtained the ISGMR strength distributions in all the Sn isotopes in good agreement with the experimental data  including the resonance widths. However  T5 has the associated K$_{∞}$ value of only 202 MeV  which is 19 Target E$_{LE}$$_{−}$$_{ISGDR}$ (MeV) Γ (MeV) Reference $^{112}$Sn 15 . 4 ± 0 . 1 4 . 9 ± 0 . 5 This work 14 . 92 +0 . 15 − 0 14 8 . 82 +0 . 26 − 0 29 TAMU $^{114}$Sn 15 . 0 ± 0 . 1 5 . 6 ± 0 . 5 This work $^{116}$Sn 14 . 9 ± 0 . 1 5 . 9 ± 0 . 5 This work 14 . 38 ± 0 . 25 5 . 84 ± 0 . 30 TAMU $^{118}$Sn 14 . 8 ± 0 . 1 6 . 1 ± 0 . 3 This work $^{120}$Sn 14 . 7 ± 0 . 1 5 . 9 ± 0 . 3 This work $^{122}$Sn 14 . 4 ± 0 . 1 6 . 7 ± 0 . 3 This work $^{124}$Sn 14 . 3 ± 0 . 1 6 . 6 ± 0 . 3 This work 13 . 31 +0 . 15 − 0 15 6 . 60 +0 . 15 − 0 13 TAMU