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

Abstract : The γ -ray emission from the nuclei $^{62,64}$Fe following Coulomb excitation at bombarding energy of 400-440 AMeV was measured with special focus on E 1 transitions in the energy region 4-8 MeV. The unstable neutron-rich nuclei $^{62,64}$Fe 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 E 1 strength is extracted and compared to microscopic quasi-particle phonon model calculations. The trend of the E 1 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 E 1 nuclear response below the neutron binding energy.
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https://hal.archives-ouvertes.fr/hal-03047536
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Submitted on : Tuesday, December 15, 2020 - 10:37:58 AM
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R. Avigo, O. Wieland, A. Bracco, F. Camera, F. Ameil, et al.. Low-lying electric dipole $γ$-continuum for the unstable $^{62,64}$Fe nuclei: Strength evolution with neutron number. Phys.Lett.B, 2020, 811, pp.135951. ⟨10.1016/j.physletb.2020.135951⟩. ⟨hal-03047536⟩

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