Abstract
The γ-ray transitions from the K=3 rotational band based on the 1172.3 keV state have been investigated using the Chalk River high-resolution β-ray spectrometer (resolution settings 0.2% and 0.06%) germanium lithium-drifted γ-ray counters and e-γ delayed coincidence techniques. From L conversion-electron subshell intensity ratios, the multipolarities of the following transitions were deduced: 78.74 keV (E2), 90.64 keV (26±3% M1 + 74±3% E2), 112.76 keV (33±5% M1 + 67±5% E2), 134.35 keV (33±12% M1 + 67±12% E2), 181.51 keV (E2), 203.43 keV (E2), 247.14 keV) (E2) and from conversion coefficient measurements, 810.0 keV (M1), 900.7 keV (M1), 912.1 keV (18±12% M1 + 82 ± 12% E2), 929.0 keV (63 ±16% M1 + 37 ± 16% E2) 1002.6 keV (12 ± 11% M1 + 88 ± 11% E2) and 1093.5 keV (E2). The half-lives of the following states were measured: 78.74 keV 1.6 ± 0.4 nsec, 1172.3 keV 7.8 ± 0.4 nsec and 1262.9 keV (≦ 0.6 nsec).
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