Isomeric states and spin polarization in A approx. 90 nuclei
The observed inhibition of M4 transitions in A approx. 90 nuclei has represented a long standing theoretical problem. In particular by calculating first- and second-order configuration mixing contributions to the inhibited M4 lifetimes of /sup 89/Y and /sup 87/Sr, it is found that the first-order perturbative treatment of the residual interaction usually used in shell-model calculations is unjustified in this case. Using random-phase approximation techniques, the renormalization effects of collective (''giant'') M4 resonances in /sup 88/Sr on the low energy M4 transitions in /sup 89/Y and /sup 87/Sr are investigated. It is concluded that the observed retardation of M4 lifetimes in these nuclei is consistent with the manifestation of nuclear spin polarization.
- Research Organization:
- Department of Physics, University of Toronto, Toronto, Canada
- OSTI ID:
- 5409324
- Journal Information:
- Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:4; ISSN PRVCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
A=90-149
Theoretical-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALINE EARTH ISOTOPES
BETA DECAY RADIOISOTOPES
BINDING ENERGY
CONFIGURATION MIXING
ELECTRON CAPTURE RADIOISOTOPES
ENERGY
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FUNCTIONS
GIANT RESONANCE
HOURS LIVING RADIOISOTOPES
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOMERIC TRANSITIONS
ISOTOPES
LIFETIME
M4-TRANSITIONS
MATHEMATICAL MODELS
MULTIPOLE TRANSITIONS
NUCLEAR MODELS
NUCLEI
ODD-EVEN NUCLEI
ORIENTATION
PERTURBATION THEORY
POLARIZATION
RADIOISOTOPES
RANDOM PHASE APPROXIMATION
RENORMALIZATION
RESONANCE
SECONDS LIVING RADIOISOTOPES
SHELL MODELS
SINGLE-PARTICLE MODEL
SPIN ORIENTATION
STABLE ISOTOPES
STRONTIUM 87
STRONTIUM 88
STRONTIUM ISOTOPES
WAVE FUNCTIONS
YTTRIUM 89
YTTRIUM ISOTOPES