Search for x-ray induced acceleration of the decay of the 31-yr isomer of (178)Hf using synchrotron radiation |
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Authors: | Ahmad I Banar J C Becker J A Gemmell D S Kraemer A Mashayekhi A McNabb D P Miller G G Moore E F Pangault L N Rundberg R S Schiffer J P Shastri S D Wang T F Wilhelmy J B |
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Institution: | Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA. |
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Abstract: | Enhanced decay of the 31-yr isomer of (178)Hf induced by x-ray irradiation has been reported previously. Here we describe an attempt to reproduce this result with an intense "white" x-ray beam from the Advanced Photon Source. No induced decay was observed. The upper limits for the energy-integrated cross sections for such a process, over the range of energies of 20--60 keV x rays, are less than 2 x 10(-27) cm(2) keV, below the previously reported values by more than 5 orders of magnitude; at 8 keV the limit is 5 x 10(-26) cm(2) keV. |
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