학술논문
Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number
Document Type
article
Author
R. Avigo; O. Wieland; A. Bracco; F. Camera; F. Ameil; T. Arici; A. Ataç; D. Barrientos; D. Bazzacco; P. Bednarczyk; G. Benzoni; B. Birkenbach; N. Blasi; H.C. Boston; S. Bottoni; S. Brambilla; B. Bruyneel; M. Ciemała; E. Clément; M.L. Cortés; F.C.L. Crespi; D.M. Cullen; D. Curien; F. Didierjean; C. Domingo-Pardo; G. Duchêne; J. Eberth; A. Görgen; A. Gadea; J. Gerl; N. Goel; P. Golubev; V. González; M. Górska; A. Gottardo; E. Gregor; G. Guastalla; T. Habermann; L.J. Harkness-Brennan; A. Jungclaus; M. Kmiecik; I. Kojouharov; W. Korten; N. Kurz; M. Labiche; N. Lalović; S. Leoni; M. Lettmann; A. Maj; R. Menegazzo; D. Mengoni; E. Merchan; B. Million; A.I. Morales; D.R. Napoli; C. Nociforo; J. Nyberg; N. Pietralla; S. Pietri; Zs. Podolyák; V.Yu. Ponomarev; A. Pullia; B. Quintana; G. Rainovski; D. Ralet; F. Recchia; M. Reese; P. Regan; P. Reiter; S. Riboldi; D. Rudolph; M.D. Salsac; E. Sanchis; L.G. Sarmiento; H. Schaffner; J. Simpson; O. Stezowski; J.J. Valiente-Dobón; H.J. Wollersheim
Source
Physics Letters B, Vol 811, Iss , Pp 135951- (2020)
Subject
Language
English
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 E1 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 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.