INVESTIGATION OF HIGH-SPIN STATES IN Er$sup 16$$sup 6$
The decay of the long-lived isomer of Ho/sup 166/ has been studied using gamma-ray scintillation spectrometers and silicon-diode detectors. The results of gamma-gamma coincidence experiments, together with least-squares analysis of the gamma-ray singles spectra, establish the presence of twenty-seven gamma-ray transitions in the decay of this isomer. The conversion-electron spectra provide relative intensities for several of the weak transitions and provided an upper limit for the endpoint energy of the main beta transition from Ho/sup l66/. The data are consistent with the existence of levels whose energies (in kev) and assignments are 80(2+), 265 (4+), 545(6+), 787 (2+), the energy of the most intense beta transition from the long-lived Ho/sup 166/ state must lie between approximately 55 and approximately 65 kev. Several possible nucleon configurntions for the negativeparity states in Er/sup 166/ observed in the decay of this activity are presented and discussed. A description of the observed positive-parity states in terms of an asymmetric-rotator model is given. The agreement between the energies and relative transition probabilities calculated using this model and those observed experimentally is excellent. Formulas for reduced transition probabilities for gammaray transitions between states having spins of 6, 7, and 8 are presented. (auth)
- Research Organization:
- Phillips Petroleum Co., Idaho Falls, Idaho
- NSA Number:
- NSA-17-013576
- OSTI ID:
- 4751322
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Vol. Vol: 129; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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