Theoretical calculations of γ-ray feeding patterns for Gd, Dy and Er nuclei
(1985) In Nuclear Physics, Section A 443(1). p.91-119- Abstract
The side-feeding patterns and the spectra of unresolved γ-lines are calculated for Gd, Dy and Er nuclei with neutron numbers from 82 to 86. Energies and configurations for states from the yrast line and approximately 2 MeV higher in energy are calculated as many-quasiparticle configurations in a deformed oblate potential. The γ-cascade is simulated by a Monte Carlo calculation. With a common average entry angular momentum of 35 h {combining short stroke overlay} to the non-collective oblate states considered, the observed variation of intensity of the strongest γ-line with spin is well reproduced. The stretched dipole part of the continuum spectra is also well reproduced, whereas the stretched quadrupole part cannot be accounted for.... (More)
The side-feeding patterns and the spectra of unresolved γ-lines are calculated for Gd, Dy and Er nuclei with neutron numbers from 82 to 86. Energies and configurations for states from the yrast line and approximately 2 MeV higher in energy are calculated as many-quasiparticle configurations in a deformed oblate potential. The γ-cascade is simulated by a Monte Carlo calculation. With a common average entry angular momentum of 35 h {combining short stroke overlay} to the non-collective oblate states considered, the observed variation of intensity of the strongest γ-line with spin is well reproduced. The stretched dipole part of the continuum spectra is also well reproduced, whereas the stretched quadrupole part cannot be accounted for. These findings are in accordance with a two-stage picture of the γ-decay. First comes a cascade of stretched quadrupole transitions, probably of collective nature. This cascade feeds into numerous weakly oblate states around spin ≈ 35 h {combining short stroke overlay}, and the decay proceeds first by weak transitions, mainly dipoles, and later by strong γ-lines.
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- author
- Åberg, Sven LU ; Døssing, Thomas LU and Neergård, Kai
- organization
- publishing date
- 1985-09-23
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Nuclear Physics, Section A
- volume
- 443
- issue
- 1
- pages
- 29 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:4243439035
- ISSN
- 0375-9474
- DOI
- 10.1016/0375-9474(85)90323-9
- language
- English
- LU publication?
- yes
- id
- 8fdcaf01-4dd5-41e4-ad4b-6785cd3783bd
- date added to LUP
- 2025-09-02 14:51:53
- date last changed
- 2025-10-14 09:39:15
@article{8fdcaf01-4dd5-41e4-ad4b-6785cd3783bd,
abstract = {{<p>The side-feeding patterns and the spectra of unresolved γ-lines are calculated for Gd, Dy and Er nuclei with neutron numbers from 82 to 86. Energies and configurations for states from the yrast line and approximately 2 MeV higher in energy are calculated as many-quasiparticle configurations in a deformed oblate potential. The γ-cascade is simulated by a Monte Carlo calculation. With a common average entry angular momentum of 35 h {combining short stroke overlay} to the non-collective oblate states considered, the observed variation of intensity of the strongest γ-line with spin is well reproduced. The stretched dipole part of the continuum spectra is also well reproduced, whereas the stretched quadrupole part cannot be accounted for. These findings are in accordance with a two-stage picture of the γ-decay. First comes a cascade of stretched quadrupole transitions, probably of collective nature. This cascade feeds into numerous weakly oblate states around spin ≈ 35 h {combining short stroke overlay}, and the decay proceeds first by weak transitions, mainly dipoles, and later by strong γ-lines.</p>}},
author = {{Åberg, Sven and Døssing, Thomas and Neergård, Kai}},
issn = {{0375-9474}},
language = {{eng}},
month = {{09}},
number = {{1}},
pages = {{91--119}},
publisher = {{Elsevier}},
series = {{Nuclear Physics, Section A}},
title = {{Theoretical calculations of γ-ray feeding patterns for Gd, Dy and Er nuclei}},
url = {{http://dx.doi.org/10.1016/0375-9474(85)90323-9}},
doi = {{10.1016/0375-9474(85)90323-9}},
volume = {{443}},
year = {{1985}},
}