The role of seniority-zero states in nuclear level densities
(2015) In Nuclear Physics, Section A 941. p.97-120- Abstract
- At low excitation energies seniority-zero states dominate the level density of K = 0 bands in deformed even even nuclei, while they play no role at higher excitation energies. We describe the level densities in a Fermi-gas model as well as in a combinatorial level-density model and compare to detailed experimental data for some rare-earth nuclei. An explanation is provided for recent observations of an odd even staggering in the spin-distribution function as an effect of r-symmetry of wave functions for deformed nuclei. The structure of 0(+) states in deformed nuclei is discussed in the model and compared to data, stressing the role of the seniority quantum number. The Fermi-gas model is utilized to obtain an overview of the odd even... (More)
- At low excitation energies seniority-zero states dominate the level density of K = 0 bands in deformed even even nuclei, while they play no role at higher excitation energies. We describe the level densities in a Fermi-gas model as well as in a combinatorial level-density model and compare to detailed experimental data for some rare-earth nuclei. An explanation is provided for recent observations of an odd even staggering in the spin-distribution function as an effect of r-symmetry of wave functions for deformed nuclei. The structure of 0(+) states in deformed nuclei is discussed in the model and compared to data, stressing the role of the seniority quantum number. The Fermi-gas model is utilized to obtain an overview of the odd even staggering phenomenon in other mass regions. Odd even staggering in spherical nuclei, appearing in open-shell nuclei, is briefly discussed as caused by fermion exchange symmetry. (C) 2015 Elsevier B.V. All rights reserved. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/8077589
- author
- Åberg, Sven LU ; Carlsson, Gillis LU ; Dossing, Th. and Moller, P.
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Level-density, Seniority-zero states, Spin-distribution, 0(+)-states
- in
- Nuclear Physics, Section A
- volume
- 941
- pages
- 97 - 120
- publisher
- Elsevier
- external identifiers
-
- wos:000360515100008
- scopus:84935010919
- ISSN
- 0375-9474
- DOI
- 10.1016/j.nuclphysa.2015.05.009
- language
- English
- LU publication?
- yes
- additional info
- The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Mathematical Physics (Faculty of Technology) (011040002)
- id
- 2479b69f-f2f4-4682-81b5-5d45de85912f (old id 8077589)
- date added to LUP
- 2016-04-01 13:09:58
- date last changed
- 2025-04-04 14:46:30
@article{2479b69f-f2f4-4682-81b5-5d45de85912f,
abstract = {{At low excitation energies seniority-zero states dominate the level density of K = 0 bands in deformed even even nuclei, while they play no role at higher excitation energies. We describe the level densities in a Fermi-gas model as well as in a combinatorial level-density model and compare to detailed experimental data for some rare-earth nuclei. An explanation is provided for recent observations of an odd even staggering in the spin-distribution function as an effect of r-symmetry of wave functions for deformed nuclei. The structure of 0(+) states in deformed nuclei is discussed in the model and compared to data, stressing the role of the seniority quantum number. The Fermi-gas model is utilized to obtain an overview of the odd even staggering phenomenon in other mass regions. Odd even staggering in spherical nuclei, appearing in open-shell nuclei, is briefly discussed as caused by fermion exchange symmetry. (C) 2015 Elsevier B.V. All rights reserved.}},
author = {{Åberg, Sven and Carlsson, Gillis and Dossing, Th. and Moller, P.}},
issn = {{0375-9474}},
keywords = {{Level-density; Seniority-zero states; Spin-distribution; 0(+)-states}},
language = {{eng}},
pages = {{97--120}},
publisher = {{Elsevier}},
series = {{Nuclear Physics, Section A}},
title = {{The role of seniority-zero states in nuclear level densities}},
url = {{http://dx.doi.org/10.1016/j.nuclphysa.2015.05.009}},
doi = {{10.1016/j.nuclphysa.2015.05.009}},
volume = {{941}},
year = {{2015}},
}