Low-energy electric dipole response in 120Sn

Abstract

The electric dipole strength in 120Sn has been extracted from proton inelastic scattering experiments at E_p = 295 MeV and at forward angles including 0 degree. Below neutron threshoild it differs from the results of a 120Sn(gamma,gamma') experiment and peaks at an excitation energy of 8.3 MeV. The total strength corresponds to 2.3(2)% of the energy-weighted sum rule and is more than three times larger than what is observed with the (gamma,gamma') reaction. This implies a strong fragmentation of the E1 strength and/or small ground state branching ratios of the excited 1- states.

7 pages, 6 figures

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Cited by in corpus (4)

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• Evolution of the dipole polarizability in the stable tin isotope chain
• Multipole excitations in hot nuclei within the finite temperature quasiparticle random phase approximation framework
• Nature of low-lying electric dipole resonance excitations in 74Ge