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Effects of Phonon--Phonon Coupling on Properties of Pygmy Resonance in $^{132}$Sn

Abstract : Starting from an effective Skyrme interaction, we study the effects of phonon–phonon coupling on the low-energy spectrum of the 1− states in 132Sn. The calculations are performed within a finite rank separable approximation for the particle-hole interaction. The inclusion of two-phonon configurations brings a sizeable contribution to the low-lying strength. Comparison with available experimental data shows a reasonable agreement for the low-energy E1 strength distribution.
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Submitted on : Wednesday, May 20, 2015 - 10:51:00 AM
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N.N. Arsenyev, A.P. Severyukhin, V.V. Voronov, N. Van Giai. Effects of Phonon--Phonon Coupling on Properties of Pygmy Resonance in $^{132}$Sn. Zakopane Conference on Nuclear Physics Extremes of the Nuclear Landscape, Aug 2014, Zakopane, Poland. pp.517-520, ⟨10.5506/APhysPolB.46.517⟩. ⟨in2p3-01153364⟩

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