Abstract
The 6 h radioactivity of 189mOs was observed after irradiation of 189Os with white synchrotron radiation produced at a superconducting wiggler installed in a 2.5 GeV electron storage ring. It was considered that production of the activity resulted mainly from the excitation of the 70 keV nuclear level in 189Os through a process referred to as nuclear excitation by electron transition (NEET). The NEET probability was deduced to be (5.7 ± 1.7) × 10 −9 per created K-hole, which was smaller by a factor of thirty than the previous result obtained with electron bombardment.
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