TY  - JOUR
AU  - AGATA Collaboration (Avigo, R. et al
AU  - Domingo-Pardo, C.
AU  - Gadea, A.
AU  - Gonzalez, V.
PY  - 2020
DA  - 2020//
TI  - Low-lying electric dipole gamma-continuum for the unstable Fe-62(,)64 nuclei: Strength evolution with neutron number
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 135951
EP  - 6pp
VL  - 811
PB  - Elsevier
KW  - Fe-64
KW  - Fe-62
KW  - Nuclear structure
KW  - Dipole excitation around neutron threshold
AB  - 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.
SN  - 0370-2693
UR  - https://doi.org/10.1016/j.physletb.2020.135951
DO  - 10.1016/j.physletb.2020.135951
LA  - English
N1  - WOS:000612225400080
ID  - AGATACollaborationAvigo_etal2020
ER  -