Nuclear chemistry research and spectroscopy with radioactive sources. Twenty-first annual progress report, February 1, 1985-January 31, 1986

The nuclear chemistry group in the School of Chemistry continues investigating the radioactive decay of nuclei far from stability under this DOE contract. These nuclei are produced with heavy ions from the Holifield Heavy Ion Research Facility [HHIRF] and studied on-line with the University Isotope Separator at Oak Ridge [UNISOR]. Radioactive decay represents a unique method for the population of low-energy, low-spin structures in nuclei, and new phenomena which do not occur near stability can be explored. Our research encompasses three aspects of nuclear structure: (1) nuclear spectroscopy with detailed γγt, e-γt, Xγt, etc., multiparameter coincidence spectrometry; (2) on-line laser hyperfine structure [hfs] and isotope shift measurements for the determination of nuclear quadrupole moments, nuclear spins, and changes in mean nuclear charge radii as a means of revealing systematic shape changes in nuclei; and (3) theoretical calculations of predictions of nuclear models for comparison with experimental level structures in nuclei studied at UNISOR. 20 refs., 9 figs., 2 tabs