Magnetic dipole excitations in even-even nuclei
(1991)- Abstract
- The properties of K(pi) = 1+ states in deformed even-even rare-earth nuclei have been investigated within the Quasiparticle Random Phase Approximation (QRPA). The B(M1) spectrum and the differential cross section for electron scattering have been calculated and are seen to be consistent with the interpretation that the experimental 1+ states first considered to be a scissors mode, actually correspond to slightly collective states with the main proton components coming from positive parity proton states. The effect of the presence of quadruple pairing on these states is also investigated, and it is seen that a (lambda, mu) = (2, +-1) quadrupole pair interaction will increase the B(M1) strength found at the low energy side of the spectrum.... (More)
- The properties of K(pi) = 1+ states in deformed even-even rare-earth nuclei have been investigated within the Quasiparticle Random Phase Approximation (QRPA). The B(M1) spectrum and the differential cross section for electron scattering have been calculated and are seen to be consistent with the interpretation that the experimental 1+ states first considered to be a scissors mode, actually correspond to slightly collective states with the main proton components coming from positive parity proton states. The effect of the presence of quadruple pairing on these states is also investigated, and it is seen that a (lambda, mu) = (2, +-1) quadrupole pair interaction will increase the B(M1) strength found at the low energy side of the spectrum. No sign of such an increase is yet seen experimentally. The effect of nuclear deformation on the B(M1) spectrum is also investigated. A schematic model indicates a seemingly quadratic deformation dependence of the summed B(M1) strength. The same type of deformation dependence is obtained in a more realistic model and the results in a sequence of Samarium isotopes are seen to be in qualitative agreement with the experimentally obtained data. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2536301
- author
- Magnusson, Charlotte LU
- supervisor
- opponent
-
- unknown], [unknown
- organization
- publishing date
- 1991
- type
- Thesis
- publication status
- published
- subject
- keywords
- Fysicumarkivet A:1991:Magnusson
- pages
- 52 pages
- defense location
- Fysiska Institutionens föreläsningssal
- defense date
- 1991-05-31 10:15:00
- language
- English
- LU publication?
- yes
- id
- 16135b17-88a8-4c5f-bda0-afc3352ece17 (old id 2536301)
- date added to LUP
- 2016-04-04 14:27:47
- date last changed
- 2023-03-17 12:08:14
@phdthesis{16135b17-88a8-4c5f-bda0-afc3352ece17, abstract = {{The properties of K(pi) = 1+ states in deformed even-even rare-earth nuclei have been investigated within the Quasiparticle Random Phase Approximation (QRPA). The B(M1) spectrum and the differential cross section for electron scattering have been calculated and are seen to be consistent with the interpretation that the experimental 1+ states first considered to be a scissors mode, actually correspond to slightly collective states with the main proton components coming from positive parity proton states. The effect of the presence of quadruple pairing on these states is also investigated, and it is seen that a (lambda, mu) = (2, +-1) quadrupole pair interaction will increase the B(M1) strength found at the low energy side of the spectrum. No sign of such an increase is yet seen experimentally. The effect of nuclear deformation on the B(M1) spectrum is also investigated. A schematic model indicates a seemingly quadratic deformation dependence of the summed B(M1) strength. The same type of deformation dependence is obtained in a more realistic model and the results in a sequence of Samarium isotopes are seen to be in qualitative agreement with the experimentally obtained data.}}, author = {{Magnusson, Charlotte}}, keywords = {{Fysicumarkivet A:1991:Magnusson}}, language = {{eng}}, school = {{Lund University}}, title = {{Magnetic dipole excitations in even-even nuclei}}, year = {{1991}}, }