Accelerated Emission of Gamma Rays from the 31-yr Isomer of {sup 178 }Hf Induced by X-Ray Irradiation
- Center for Quantum Electronics, University of Texas at Dallas, Richardson, Texas 75083 (United States)
- Joint Institute for Nuclear Research, Dubna, 141980 (Russia)
- H. Hulubei National Institute of Physics and Nuclear Engineering and RC-IGE Foundation, Bucharest (Romania)
- Scientific Center Institute for Nuclear Research, Kiev (Ukraine)
- Center for Photon Induced Processes, Youngstown State University, Youngstown, Ohio 44555 (United States)
- System Technology Group, SRS Technologies, Huntsville, Alabama 35812 (United States)
- Air Force Research Laboratory, DEPA, Kirtland Air Force Base, Albuquerque, New Mexico 87117 (United States)
- Sandia National Laboratory, Albuquerque, New Mexico 87185 (United States)
A sample of 6.3{times}10{sup 14} nuclei of the 4-quasiparticle isomer of {sup 178}Hf having a half-life of 31thinspthinspyr and excitation energy of 2.446thinspthinspMeV was irradiated with x-ray pulses from a device typically used in dental medicine. It was operated at 15thinspthinspmA to produce bremsstrahlung radiation with an end point energy set to be 70 or 90thinspthinspkeV. Spectra of the isomeric target were taken with a high purity Ge detector. Intensities of selected transitions in the normal decay cascade of the {sup 178}Hf isomer were found to increase by about 4{percent} . Such an accelerated decay is consistent with an integrated cross section of 1{times}10{sup {minus}21}thinspcm{sup 2}thinspkeV for the resonant absorption of x rays to induce gamma decay. {copyright} {ital 1999} {ital The American Physical Society }
- OSTI ID:
- 328533
- Journal Information:
- Physical Review Letters, Vol. 82, Issue 4; Other Information: PBD: Jan 1999
- Country of Publication:
- United States
- Language:
- English
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