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

Avigo, R. ; Wieland, O. ; Bracco, A. ; Camera, F. ; Ameil, F. ; Golubev, Pavel LU ; Lalović, Nataša LU ; Rudolph, Dirk LU ; Sarmiento Pico, Luis LU and Wollersheim, H.J. (2020) In Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 811.
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... (More)
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. © 2020 The Author(s) (Less)
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publishing date
type
Contribution to journal
publication status
published
subject
keywords
62Fe, 64Fe, Dipole excitation around neutron threshold, Nuclear structure
in
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
volume
811
article number
135951
pages
6 pages
publisher
Elsevier
external identifiers
  • scopus:85096469255
ISSN
0370-2693
DOI
10.1016/j.physletb.2020.135951
project
Nuclear Structure at the Limits: Isotope-selective Spectroscopy
FAIR-NUSTAR: HISPEC-DESPEC experiment & Super-FRS contributions
language
English
LU publication?
yes
id
de27ffc1-4287-4f6c-a948-b1300ec751e5
date added to LUP
2020-11-30 10:30:47
date last changed
2020-12-08 03:37:25
@article{de27ffc1-4287-4f6c-a948-b1300ec751e5,
  abstract     = {The γ-ray emission from the nuclei <sup>62,64</sup>Fe following Coulomb excitation at bombarding energy of 400-440 AMeV was measured with special focus on <i>E</i>1 transitions in the energy region 4-8 MeV. The unstable neutron-rich nuclei <sup>62,64</sup>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 <i>E</i>1 strength is extracted and compared to microscopic quasi-particle phonon model calculations. The trend of the <i>E</i>1 strength with increasing neutron number is found to be fairly well reproduced with calculations that assume a rather complex structure of the 1<sup>−</sup> states (three-phonon states) inducing a strong fragmentation of the <i>E</i>1 nuclear response below the neutron binding energy. © 2020 The Author(s)},
  author       = {Avigo, R. and Wieland, O. and Bracco, A. and Camera, F. and Ameil, F. and Golubev, Pavel and Lalović, Nataša and Rudolph, Dirk and Sarmiento Pico, Luis and Wollersheim, H.J.},
  issn         = {0370-2693},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics},
  title        = {Low-lying electric dipole γ-continuum for the unstable <sup>62,64</sup>Fe nuclei: Strength evolution with neutron number},
  url          = {http://dx.doi.org/10.1016/j.physletb.2020.135951},
  doi          = {10.1016/j.physletb.2020.135951},
  volume       = {811},
  year         = {2020},
}