Abstract
The radioisotope /sup 21/O was produced in the /sup 9/Be(/sup 18/O,2pa)/sup 21/O reaction using 80--110-MeV /sup 18/O ions. Activities emerging from a Be target foil were stopped in a He gas cell and transferred to a counting area where ..gamma.. and ..beta.. rays were measured using Ge(Li) and plastic detectors. Thirteen g rays were observed in singles, g-g, or b-g coincidence measurements following the b decay of /sup 21/O to known excited states of /sup 21/F at 1730, 3460, 3518, (3639), 4572, and 4584 keV. Detailed information on the properties of the /sup 21/F energy levels was obtained. By stopping the gas flow and measuring the decay of g rays, the half-life of /sup 21/O was found to be 3.42 +- 0.10 sec. ..beta.. end-point energies measured by ..beta..-..gamma.. coincidences lead to a mass excess of 8105 +- 175 keV for /sup 21/O in agreement with more accurate reaction Q values. Detailed shell-model calculations were carried out and reproduce the main features of the /sup 21/O decay scheme.
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