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Properties of superdeformed bands in the {sup 151}Tb nucleus studied with the EUROGAM French-British spectrometer; Proprietes des bandes superdeformees dans le noyau de {sup 151}Tb etudiees avec le spectrometre franco-britannique EUROGAM

Abstract

The subject of this thesis is the study of superdeformation (SD) of the atomic nucleus. In the mass region A {approx_equal} 150 those nuclei have a quadrupole deformation of about 0.6. However, this value is an average and the microscopic structure reflected in the band configurations, affects this deformation. Determination of this value by electric quadrupole moment studies is particularly useful especially for the identical SD bands (SD bands belonging to neighbouring nuclei and having the same moment of inertia). Knowledge of the different quadrupole deformation should shed light on the competition between mass difference, spin alignment and deformation of the nucleus. The electric quadrupole moments are deduced from lifetime measurements of the SD states using the Doppler Shift Attenuation Method. Experimentally, one observes a variation in the electric quadrupole moments of the lowest SD states which suggests a gradual change of the nuclear deformation towards normal less deformed shapes. The deexcitation mechanism is poorly understood in the A {approx_equal} 150 mass region due to lack of experimental information: up to now, no transition connecting the second and the first potential well has been observed for these SD states. Experimental studies of deexcitation patterns of SD bands are therefore crucial  More>>
Authors:
Finck, Christian [1] 
  1. Centre de Recherches Nucleaires de Strasbourg-Cronenbourg, 67 (France)
Publication Date:
Apr 24, 1997
Product Type:
Thesis/Dissertation
Report Number:
CRN-97-18
Reference Number:
SCA: 663110; 663570; PA: AIX-30:020262; EDB-99:052686; SN: 99002092590
Resource Relation:
Other Information: DN: 121 refs., 61 figs., 22 tabs.; TH: Theses (Ph.D); PBD: 24 Apr 1997
Subject:
66 PHYSICS; DATA ANALYSIS; EXCITED STATES; GAMMA SPECTROMETERS; INTERMEDIATE MASS NUCLEI; MULTIPLICITY; NUCLEAR MODELS; NUCLEAR STRUCTURE; SUPERDEFORMED NUCLEI; TERBIUM 151
OSTI ID:
340768
Research Organizations:
Centre de Recherches Nucleaires de Strasbourg-Cronenbourg, 67 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE99622172; TRN: FR9903069020262
Availability:
INIS; OSTI as DE99622172
Submitting Site:
FRN
Size:
200 p.
Announcement Date:

Citation Formats

Finck, Christian. Properties of superdeformed bands in the {sup 151}Tb nucleus studied with the EUROGAM French-British spectrometer; Proprietes des bandes superdeformees dans le noyau de {sup 151}Tb etudiees avec le spectrometre franco-britannique EUROGAM. France: N. p., 1997. Web.
Finck, Christian. Properties of superdeformed bands in the {sup 151}Tb nucleus studied with the EUROGAM French-British spectrometer; Proprietes des bandes superdeformees dans le noyau de {sup 151}Tb etudiees avec le spectrometre franco-britannique EUROGAM. France.
Finck, Christian. 1997. "Properties of superdeformed bands in the {sup 151}Tb nucleus studied with the EUROGAM French-British spectrometer; Proprietes des bandes superdeformees dans le noyau de {sup 151}Tb etudiees avec le spectrometre franco-britannique EUROGAM." France.
@misc{etde_340768,
title = {Properties of superdeformed bands in the {sup 151}Tb nucleus studied with the EUROGAM French-British spectrometer; Proprietes des bandes superdeformees dans le noyau de {sup 151}Tb etudiees avec le spectrometre franco-britannique EUROGAM}
author = {Finck, Christian}
abstractNote = {The subject of this thesis is the study of superdeformation (SD) of the atomic nucleus. In the mass region A {approx_equal} 150 those nuclei have a quadrupole deformation of about 0.6. However, this value is an average and the microscopic structure reflected in the band configurations, affects this deformation. Determination of this value by electric quadrupole moment studies is particularly useful especially for the identical SD bands (SD bands belonging to neighbouring nuclei and having the same moment of inertia). Knowledge of the different quadrupole deformation should shed light on the competition between mass difference, spin alignment and deformation of the nucleus. The electric quadrupole moments are deduced from lifetime measurements of the SD states using the Doppler Shift Attenuation Method. Experimentally, one observes a variation in the electric quadrupole moments of the lowest SD states which suggests a gradual change of the nuclear deformation towards normal less deformed shapes. The deexcitation mechanism is poorly understood in the A {approx_equal} 150 mass region due to lack of experimental information: up to now, no transition connecting the second and the first potential well has been observed for these SD states. Experimental studies of deexcitation patterns of SD bands are therefore crucial to fix the decay-out mechanism. Experimental data on the {sup 151}Tb nucleus were collected via fusion-evaporation reaction, using the EUROGAM phase II array. (author) 121 refs., 61 figs., 22 tabs.}
place = {France}
year = {1997}
month = {Apr}
}