Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number

R. Avigo, O. Wieland, A. Bracco, F. Camera, F. Ameil, et al., Pavel Golubev, Nataša Lalović, Dirk Rudolph, Luis Sarmiento Pico, H.J. Wollersheim

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The γ-ray emission from the nuclei 62,64Fe following Coulomb excitation at bombarding energy of 400-440 AMeV was measured with special focus on E1 transitions in the energy region 4-8 MeV. The unstable neutron-rich nuclei 62,64Fe were produced at the FAIR-GSI laboratories and selected with the FRS spectrometer. The γ decay was detected with AGATA. From the measured γ-ray spectra the summed E1 strength is extracted and compared to microscopic quasi-particle phonon model calculations. The trend of the E1 strength with increasing neutron number is found to be fairly well reproduced with calculations that assume a rather complex structure of the 1 states (three-phonon states) inducing a strong fragmentation of the E1 nuclear response below the neutron binding energy. © 2020 The Author(s)
Original languageEnglish
Article number135951
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Publication statusPublished - 2020

Subject classification (UKÄ)

  • Subatomic Physics


  • 62Fe
  • 64Fe
  • Dipole excitation around neutron threshold
  • Nuclear structure


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