Angular correlation measurements from the β decay of ¹⁶⁶mHo and ¹⁶⁶Tm and the properties of the gamma vibrational band in ¹⁶⁶Er Public Deposited

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  • Angular correlations of gamma rays from excited states of ¹⁶⁶Er have been measured following the β decays of ¹⁶⁶ Ho (Jπ =7-, t 1/2 =1200y, Q= 1854 ke V) and ¹⁶⁶Tm (Jπ = 2+, t 1/2, = 7.7h, Q=3040 keV). Data was collected using the 8π spectrometer, an array of 20 Compton-suppressed Ge detectors. Basic theory of gamma ray spectroscopy and deformed nuclei is presented along with experimental methods and results. The δ(E2 /M1) mixing ratios have been measured for ten mixed-multipolarity transitions between the gamma and ground rotational bands, as well as for three of the intra-gamma-band transitions, two of which have not previously been measured. Comparison with previous experiments shows favorable results, with generally smaller limits of uncertainty. Results are compared with basic and modem theories about the collective behavior of these rotational bands.
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