Center for Quantum Electronics

University of Texas at Dallas


In August, 1998 a sample of 6.3 X 1014 nuclei of the 4-QP isomer of 178Hf having a half-life of 31 yr and an excitation energy of 2.446 MeV was irradiated with x-ray pulses from a device typically used in dental medicine. It was operated at 15 mA and 70 or 90 kV, as selected.
A 2.0 1.3% increase of emission in the Ground State Band, GSB was observed.
It was the first demonstration of the excitation of the 178Hf isomer to a K-mixing level from which it could subsequently emit the high energy density originally stored by the isomer.

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