Showing papers by "R. F. Casten published in 1990"
Book•
26 Apr 1990
TL;DR: In this paper, the shell model is used to model the vibrational and rotational motion of even-even nuclei. But it is not suitable for the deformed shell model or the Nilsson model.
Abstract: PART I: INTRODUCTION 1. Introduction 2. The Nuclear Landscape PART II: SHELL MODEL AND RESIDUAL INTERACTIONS 3. The Independent Particle Model 4. The Shell Model: Two-Particle Configurations 5. Multiparticle Configurations PART III: COLLECTIVITY, PHASE TRANSITIONS, DEFORMATION 6. Collective Excitations in even-even Nuclei: Vibrational and Rotational Motion 7. Evolution of Collectivity 8. The deformed Shell Model or Nilsson Model 9. Nilsson Model: Applications and Refinements 10. Microscopic Treatment of Collective Vibrations PART IV: EXPERIMENTAL TECHNIQUES 11. Exotic Nuclei and Radioactive Beams References Index
332 citations
TL;DR: Experimental data suggest the coexistence of spherical/vibrational and deformed states and allow the extraction of mixing matrix elements between them and a quadrupole moment of 3.5(4) {ital e} b for the de formed states in {sup 97}Sr has been deduced.
Abstract: A recently developed technique for fast timing measurements using {beta}-{gamma}-{gamma} coincidences with plastic, BaF{sub 2} and Ge detectors, respectively, has been used to measure lifetimes in the range 5--1500 ps in the neutron-rich nuclei {sup 97}Sr, {sup 97}Y, and {sup 97}Zr. The results for {sup 97}Y are interpreted in terms of quadrupole vibrational excitations. For {sup 97}Sr the experimental data suggest the coexistence of spherical/vibrational and deformed states and allow the extraction of mixing matrix elements between them. A quadrupole moment of {vert bar}{ital Q}{sub 0}{vert bar}=3.5(4) {ital e} b for the deformed states in {sup 97}Sr has been deduced.
19 citations