期刊
PHYSICS LETTERS B
卷 679, 期 3, 页码 203-208出版社
ELSEVIER
DOI: 10.1016/j.physletb.2009.07.025
关键词
Nuclear isomer; Hf-178(m2); Electromagnetic transitions; Induced depletion; Synchrotron radiation
资金
- Youngstown State University [F49620-02-1-0187, FA9550-05-1-0486]
Electromagnetic transitions within nuclei reflect specific aspects of nuclear structure. This is particularly true for metastable excited states, or isomers, like Hf-178(m2) (T-1/2 = 31 years, excitation energy 2446 keV). The interaction of external radiation with isomers can be used to study atomic and nuclear properties and. perhaps, to induce a release of the stored energy. Some experiments indicated that low-energy photons near the L-3 edge (9.561 keV) Of hafnium could cause this to occur for Hf-178(m2), but the lack of a viable physical model and null experiments by other groups have left these claims in doubt. The present work describes a new experiment to examine this process by closely duplicating the irradiation conditions in positive studies, but using a more advanced multi-detector gamma array. No support for ail induced depletion of Hf-178(m2) by low-energy photons was obtained, with an upper limit for the integral cross section that is eight orders-of-magnitude below the reported value. (C) 2009 Elsevier B.V. All rights reserved.
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