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Phys. Rev. C 67, 041305(R) (2003) [4 pages]

Search for x-ray induced decay of the 31-yr isomer of 178Hf at low x-ray energies

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I. Ahmad1, J. C. Banar2, J. A. Becker3, T. A. Bredeweg2, J. R. Cooper3, D. S. Gemmell1, A. Mashayekhi4, D. P. McNabb3, E. F. Moore1, P. Palmer2, R. S. Rundberg2, J. P. Schiffer1, S. D. Shastri4, T. F. Wang3, and J. B. Wilhelmy2
1Physics Division, Argonne National Laboratory, Argonne, Illinois 60439
2Los Alamos National Laboratory, Los Alamos, New Mexico 87545
3Lawrence Livermore National Laboratory, Livermore, California 94550
4Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439

Received 18 November 2002; published 30 April 2003

Upper limits for the energy-integrated cross section for the decay of the 31-yr 178Hf isomer, induced by x-ray irradiation, are extended to lower x-ray energies than we reported previously. Over the range of incident x-ray energies 6<Ex (keV)<20, we report the energy-integrated cross section as less than 1×10-26cm2keV, with less stringent limits set down to 4 keV. These limits are at least 3 orders of magnitude below values for which enhancements to the isomer decay rate have been reported by other workers.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.67.041305
DOI:
10.1103/PhysRevC.67.041305
PACS:
23.20.-g, 23.90.+w, 25.20.Dc, 27.70.+q
 
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