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Evidence for Pygmy and Giant Dipole Resonances in 130Sn and 132Sn

Abstract : The dipole strength distribution above the one-neutron separation energy was measured in the unstable 130Sn and the double-magic 132Sn isotopes. The results were deduced from Coulomb dissociation of secondary Sn beams with energies around 500 MeV/nucleon, produced by in-flight fission of a primary 238U beam. In addition to the giant dipole resonance, a resonancelike structure ("pygmy resonance") is observed at a lower excitation energy around 10 MeV exhausting a few percent of the isovector E1 energy-weighted sum rule. The results are discussed in the context of a predicted new dipole mode of excess neutrons oscillating out of phase with the core nucleons.
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http://hal.in2p3.fr/in2p3-00025256
Contributor : Muriel Fallot <>
Submitted on : Thursday, December 22, 2005 - 11:35:10 AM
Last modification on : Wednesday, October 2, 2019 - 5:22:01 PM

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P. Adrich, A. Klimkiewicz, Muriel Fallot, K. Boretzky, T. Aumann, et al.. Evidence for Pygmy and Giant Dipole Resonances in 130Sn and 132Sn. Physical Review Letters, American Physical Society, 2005, 95, pp.132501. ⟨10.1103/PhysRevLett.95.132501⟩. ⟨in2p3-00025256⟩

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