N. N. Arsenyev, A. P. Severyukhin, V. V. Voronov, Nguyen Van Giai
Starting from an effective Skyrme interaction we study effects of phonon-phonon coupling on the low-energy electric dipole response in $^{124-132}$Sn. The QRPA calculations are performed within a finite rank separable approximation. The inclusion of two-phonon configurations gives a considerable contribution to low-lying strength. Comparison with available experimental data shows a reasonable agreement for the low-energy $E1$ strength distribution.
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http://arxiv.org/abs/1209.6146
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