%0 Journal Article
%T Low-lying electric dipole gamma-continuum for the unstable Fe-62(,)64 nuclei: Strength evolution with neutron number
%A AGATA Collaboration (Avigo, R. et al
%A Domingo-Pardo, C.
%A Gadea, A.
%A Gonzalez, V.
%J Physics Letters B
%D 2020
%V 811
%I Elsevier
%@ 0370-2693
%G English
%F AGATACollaborationAvigo_etal2020
%O WOS:000612225400080
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4700), last updated on Fri, 19 Feb 2021 08:23:08 +0000
%X The gamma-ray emission from the nuclei Fe-62,Fe-64 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 Fe-62,Fe-64 were produced at the FAIR-GSI laboratories and selected with the FRS spectrometer. The gamma decay was detected with AGATA. From the measured gamma-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.
%K Fe-64
%K Fe-62
%K Nuclear structure
%K Dipole excitation around neutron threshold
%R 10.1016/j.physletb.2020.135951
%U https://doi.org/10.1016/j.physletb.2020.135951
%P 135951-6pp