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

AuthorsAvigo, R.; Wieland, O.; Bracco, A.; Camera, F.; Ameil, F.; Arici, T.; Ataç, A.; Barrientos, D.; Bazzacco, D.; Bednarczyk, P.; Benzoni, G.; Birkenbach, B.; Blasi, N.; Boston, H.C.; Bottoni, S.; Brambilla, S.; Bruyneel, B.; Ciemata, M.; Clément, E.; Cortés, M.L.; Crespi, F.C.L.; Cullen, D.M.; Gottardo, A.; Gregor, E.; Guastalla, G.; Habermann, T.; Harkness-Brennan, L.J.; Jungclaus, Andrea CSIC ORCID; Kmiecik, M.; Kojouharov, I.; Curien, D.; Didierjean, F.; Domingo-Pardo, C.; Duchêne, G.; Eberth, J.; Görgen, A.; Gadea, Andrés CSIC ORCID; Gerl, J.; Goel, N.; Golubev, P.; González, V.; Górska, M.; Korten, W.; Kurz, N.; Labiche, M.; Lalovic, N.; Leoni, S.; Lettmann, M.; Maj, A.; Quintana, B.; Sanchis, E.
Nuclear structure
Dipole excitation around neutron threshold
Issue Date16-Nov-2020
PublisherElsevier BV
CitationPhysics Letters B 811: 135951 (2020)
AbstractThe γ-ray emission from the nuclei 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 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 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.
Description6 pags., 4 figs.
Publisher version (URL)
Identifiersdoi: 10.1016/j.physletb.2020.135951
issn: 0370-2693
Appears in Collections:(CFMAC-IEM) Artículos
(IFIC) Artículos

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