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Measurement of level lifetimes in the ps range and model interpretations for neutron-rich A {approx_equal} 100 nuclei

Abstract

The nuclear structure of A {proportional_to} 100 nuclei has been studied in the frame of this thesis with a recently developed {beta} - {gamma} - {gamma} triple coincidence fast timing technique and different models such as shell model, hydrodynamic model, Nilsson and particle-rotor models. This technique which allows the measurement of the level lifetimes in the ps range has been applied at JOSEF at the research reactor DIDO of KFA Juelich in studes of the short-lived neutron-rich nuclei in the A {approx_equal} 100 region. Lifetimes of level in {sup 96},{sup 98},{sup 100} ZR, {sup 99},{sup 101}-{sup 104} Nb, {sup 100}-{sup 105} Mo have been measured, which are in many cases completely new, and otherwise more precise than previously published data. From the lifetimes of the members of rotational bands, the size of the nuclear deformations has been deduced. (orig./HSI). [Deutsch] Im Rahmen dieser Doktorarbeit wurde die Kernstruktur der A {proportional_to} 100 Kerne untersucht. Dazu wurden mittels einer {beta} - {gamma} - {gamma} Dreifachkoinzidenz-Technik Lebensdauern von Energieniveaus im ps-Bereich gemessen und Rechnungen im Rahmen des Schalenmodells fuer sphaerische Kerne sowie mittels des Nilsson- und Teilchen-Rotor Modells fuer deformierte Nuklide durchgefuehrt. Eigenschaften, welche hier kernspektroskopische Studien ermoeglichen, die in anderen Massenbereichen unmoeglich  More>>
Authors:
Publication Date:
Aug 01, 1992
Product Type:
Thesis/Dissertation
Report Number:
Juel-2663
Reference Number:
SCA: 663220; 663110; 663560; PA: DEN-92:016359; SN: 93000906089
Resource Relation:
Other Information: TH: Diss.; PBD: Aug 1992
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; NEUTRON-RICH ISOTOPES; DE-EXCITATION; NUCLEAR DEFORMATION; ZIRCONIUM 96; ZIRCONIUM 89; ZIRCONIUM 100; NIOBIUM 99; NIOBIUM 101; NIOBIUM 102; NIOBIUM 103; MOLYBDENUM 100; MOLYBDENUM 101; MOLYBDENUM 102; MOLYBDENUM 103; MOLYBDENUM 104; MOLYBDENUM 105; ROTATIONAL STATES; EXPERIMENTAL DATA; NUCLEAR STRUCTURE; PARTICLE-CORE COUPLING MODEL; SHELL MODELS; NILSSON-MOTTELSON MODEL; LIFETIME; BETA-MINUS DECAY; GAMMA CASCADES; E1-TRANSITIONS; E2-TRANSITIONS; E3-TRANSITIONS; HALF-LIFE; MIXING RATIO; STRENGTH FUNCTIONS; NUCLEAR ELECTRIC MOMENTS; M1-TRANSITIONS; MOMENT OF INERTIA; QUADRUPOLE MOMENTS; HIGH SPIN STATES; TECHNETIUM ISOTOPES; 663220; 663110; 663560; ELECTROMAGNETIC TRANSITIONS; GENERAL AND AVERAGE PROPERTIES OF NUCLEI AND NUCLEAR ENERGY LEVELS; A = 90-149
OSTI ID:
10106195
Research Organizations:
Forschungszentrum Juelich GmbH (Germany). Inst. fuer Kernphysik; Koeln Univ. (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE93744616; TRN: DE9216359
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
123 p.
Announcement Date:
Jun 30, 2005

Citation Formats

Meihua, Liang. Measurement of level lifetimes in the ps range and model interpretations for neutron-rich A {approx_equal} 100 nuclei. Germany: N. p., 1992. Web.
Meihua, Liang. Measurement of level lifetimes in the ps range and model interpretations for neutron-rich A {approx_equal} 100 nuclei. Germany.
Meihua, Liang. 1992. "Measurement of level lifetimes in the ps range and model interpretations for neutron-rich A {approx_equal} 100 nuclei." Germany.
@misc{etde_10106195,
title = {Measurement of level lifetimes in the ps range and model interpretations for neutron-rich A {approx_equal} 100 nuclei}
author = {Meihua, Liang}
abstractNote = {The nuclear structure of A {proportional_to} 100 nuclei has been studied in the frame of this thesis with a recently developed {beta} - {gamma} - {gamma} triple coincidence fast timing technique and different models such as shell model, hydrodynamic model, Nilsson and particle-rotor models. This technique which allows the measurement of the level lifetimes in the ps range has been applied at JOSEF at the research reactor DIDO of KFA Juelich in studes of the short-lived neutron-rich nuclei in the A {approx_equal} 100 region. Lifetimes of level in {sup 96},{sup 98},{sup 100} ZR, {sup 99},{sup 101}-{sup 104} Nb, {sup 100}-{sup 105} Mo have been measured, which are in many cases completely new, and otherwise more precise than previously published data. From the lifetimes of the members of rotational bands, the size of the nuclear deformations has been deduced. (orig./HSI). [Deutsch] Im Rahmen dieser Doktorarbeit wurde die Kernstruktur der A {proportional_to} 100 Kerne untersucht. Dazu wurden mittels einer {beta} - {gamma} - {gamma} Dreifachkoinzidenz-Technik Lebensdauern von Energieniveaus im ps-Bereich gemessen und Rechnungen im Rahmen des Schalenmodells fuer sphaerische Kerne sowie mittels des Nilsson- und Teilchen-Rotor Modells fuer deformierte Nuklide durchgefuehrt. Eigenschaften, welche hier kernspektroskopische Studien ermoeglichen, die in anderen Massenbereichen unmoeglich oder wesentlich schwieriger sind. Dazu gehoeren die abrupte Formaenderung der Kerne zwischen den Neutronzahlen N=58 und N=60, zum Beispiel vom sphaerischen {sup 96} Zr zum stark deformierten {sup 100}Zr, und magischen Eigenschaften des {sup 96}Zr, die den Einfluss der geschlossenen Unterschalen bei Z=40 und N=56 zeigen. Wegen der ungewoehnlich ploetzlichen Formaenderung bei N {proportional_to} 60 wird Form-Koexistenz erwartet und auch bei einigen Kernen mit N=59 und 60 beobachtet. Die Kerne des A {approx_equal} 100 Bereichs von Deformationen sind meistens neutronenreich und sind experimentell schwer zugaenglich, da sie nur durch die Kernspaltung produziert werden. Um solche Kerne zu untersuchen, stand der gas gefuellte Separator JOSEF am Forschungsreaktor DIDO der KFA Juelich zur Verfuegung. Die Messung von Lebensdauern einzelner Niveaus ergibt bei diesen Nukliden besonders wertvollen Kernstrukturinformation, da dadurch Schalen-Modell-Konfigurationen oder Deformationen bestimmt werden koennen. (orig./HSI).}
place = {Germany}
year = {1992}
month = {Aug}
}