Center for Quantum Electronics

  University of Texas at Dallas
Once it is established to high confidence that x-ray irradiation causes an increase in the counts collected in lines of the GSB, the possibility of system error must be eliminated.
Irradiation caused no enhancement of lines from the impurity, 172Lu nor from a 133Ba fiducial included in the geometry. Conversely, nothing appeared to be enhanced when the isomer target was nearby and an empty target holder was placed in the x-ray beam to give the same amount of scattered x-rays.
Inserting 178Hf isomers into the x-ray beam was necessary and sufficient to enhance g emission in the GSB.
Lower panel is a reference spectrum
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