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Title	Low-lying electric dipole $γ$-continuum for the unstable $^{62,64}$Fe nuclei: Strength evolution with neutron number
Author(s)	Avigo, R (INFN, Milan ; Milan U.) ; Wieland, O (INFN, Milan) ; Bracco, A (INFN, Milan ; Milan U.) ; Camera, F (INFN, Milan ; Milan U.) ; Ameil, F (Darmstadt, GSI) ; Arici, T (Darmstadt, GSI) ; Ataç, A (Royal Inst. Tech., Stockholm) ; Barrientos, D (CERN) ; Bazzacco, D (INFN, Padua) ; Bednarczyk, P (Cracow, INP) ; Benzoni, G (INFN, Milan) ; Birkenbach, B (Cologne U.) ; Blasi, N (INFN, Milan) ; Boston, H C (Liverpool U.) ; Bottoni, S (INFN, Milan ; Milan U.) ; Brambilla, S (INFN, Milan) ; Bruyneel, B (IRFU, Saclay) ; Ciemała, M (Cracow, INP) ; Clément, E (GANIL) ; Cortés, M L (Darmstadt, Tech. Hochsch. ; Darmstadt, GSI) ; Crespi, F C L (INFN, Milan ; Milan U.) ; Cullen, D M (Manchester U.) ; Curien, D (U. Strasbourg) ; Didierjean, F (U. Strasbourg) ; Domingo-Pardo, C (Valencia U., IFIC) ; Duchêne, G (U. Strasbourg) ; Eberth, J (Cologne U.) ; Görgen, A (Oslo U.) ; Gadea, A (Valencia U., IFIC) ; Gerl, J (Darmstadt, GSI) ; Goel, N (Darmstadt, GSI) ; Golubev, P (Lund U.) ; González, V (Valencia U., IFIC) ; Górska, M (Darmstadt, GSI) ; Gottardo, A (INFN, Padua ; INFN, Legnaro) ; Gregor, E (Darmstadt, GSI) ; Guastalla, G (Darmstadt, Tech. U. ; Darmstadt, GSI) ; Habermann, T (Darmstadt, GSI) ; Harkness-Brennan, L J (Liverpool U.) ; Jungclaus, A (CSIC, Madrid) ; Kmiecik, M (Cracow, INP) ; Kojouharov, I (Darmstadt, GSI) ; Korten, W (IRFU, Saclay) ; Kurz, N (Darmstadt, GSI) ; Labiche, M (Daresbury) ; Lalović, N (Lund U.) ; Leoni, S (INFN, Milan ; Milan U.) ; Lettmann, M (Darmstadt, Tech. U.) ; Maj, A (Cracow, INP) ; Menegazzo, R (INFN, Padua) ; Mengoni, D (INFN, Padua ; Padua U.) ; Merchan, E (Darmstadt, GSI) ; Million, B (INFN, Milan) ; Morales, A I (INFN, Milan ; Milan U.) ; Napoli, D R (INFN, Legnaro) ; Nociforo, C (Darmstadt, GSI) ; Nyberg, J (Uppsala U.) ; Pietralla, N (Darmstadt, Tech. U.) ; Pietri, S (Darmstadt, GSI) ; Podolyák, Zs (Surrey U.) ; Ponomarev, V Yu (Darmstadt, Tech. U.) ; Pullia, A (INFN, Milan ; Milan U.) ; Quintana, B (U. Salamanca (main)) ; Rainovski, G (Sofiya U.) ; Ralet, D (Darmstadt, GSI ; Darmstadt, Tech. U.) ; Recchia, F (INFN, Padua ; Padua U.) ; Reese, M (Darmstadt, Tech. U.) ; Regan, P (Surrey U.) ; Reiter, P (Cologne U.) ; Riboldi, S (INFN, Milan ; Milan U.) ; Rudolph, D (Lund U.) ; Salsac, M D (IRFU, Saclay) ; Sanchis, E (Valencia U., Dept. Ing. Electronica) ; Sarmiento, L G (Lund U.) ; Schaffner, H (Darmstadt, GSI) ; Simpson, J (Daresbury) ; Stezowski, O (Lyon U.) ; Valiente-Dobón, J J (INFN, Legnaro) ; Wollersheim, H J (Darmstadt, GSI)
Publication	2020
Number of pages	6
In:	Phys. Lett. B 811 (2020) 135951
DOI	10.1016/j.physletb.2020.135951
Subject category	Nuclear Physics - Experiment
Abstract	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 E 1 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. 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.
Copyright/License	© 2020 The Author(s) (License: CC-BY-4.0)

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