학술논문
Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number.
Document Type
Article
Author
Source
Subject
*QUASIPARTICLES
*BINDING energy
*NEUTRON temperature
*COULOMB excitation
*NUCLEAR structure
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Language
ISSN
0370-2693
Abstract
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 E 1 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 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. [ABSTRACT FROM AUTHOR]