Fragmentation of electric dipole strength in N=82 isotones

Abstract

Fragmentation of the dipole strength in the N=82 isotones 140Ce, 142Nd and 144Sm is calculated using the second random-phase approximation (SRPA). In comparison with the result of the random-phase approximation (RPA), the SRPA provides the additional damping of the giant dipole resonance and the redistribution of the low-energy dipole strength. Properties of the low-energy dipole states are significantly changed by the coupling to two-particle-two-hole (2p2h) states, which are also sensitive to the correlation among the 2p2h states. Comparison with available experimental data shows a reasonable agreement for the low-energy E1 strength distribution.

4 pages, 6 fugures

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Cited by in corpus (8)

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• Origin of Low-Lying Enhanced E1 Strength in Rare-Earth Nuclei
• Effective density functionals beyond mean field
• Nature of low-lying electric dipole resonance excitations in 74Ge
• A systematic study of giant quadrupole resonances with the subtracted second random--phase approximation: beyond--mean--field centroids and fragmentation
• Estimation of 2p2h effect on Gamow-Teller transition with Second Tamm-Dancoff-Approximation
• Pygmy resonances and symmetry energy