Phys. Rev. Lett. 87, 072503 (2001) [4 pages]Search for X-Ray Induced Acceleration of the Decay of the 31-Yr Isomer of 178Hf Using Synchrotron RadiationReceived 18 April 2001; published 27 July 2001 Enhanced decay of the 31-yr isomer of 178Hf 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 2×10-27cm2keV, below the previously reported values by more than 5 orders of magnitude; at 8 keV the limit is 5×10-26 cm2keV. © 2001 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.87.072503
DOI:
10.1103/PhysRevLett.87.072503
PACS:
27.70.+q, 23.20.-g, 23.90.+w, 25.20.Dc
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