13-17 June 2022
Berkeley, CA
US/Pacific timezone

Measurements of the E1-strength in Fe and Ni nuclei around the threshold

14 Jun 2022, 16:10
Berkeley, CA

Berkeley, CA

Lawrence Berkeley National Laboratory
Oral Oral Presentations NS2022 Plenary


Oliver Wieland (INFN seziona di Milano)


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 E1 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 HPGE tracking array. 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.

Primary author

Oliver Wieland (INFN seziona di Milano)

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