Revision of forensics-relevant nuclear data in Sb127 β decay
| Autor: | Brian Bucher, E. M. May, Mathew S. Snow, Kevin P. Carney, Jana K. Pfeiffer, Mathew T. Kinlaw, Edna S Cardenas, Jessica L. Ward, Martha R. Finck, J. J. Horkley |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Physical Review C. 99 |
| ISSN: | 2469-9993 2469-9985 |
| Popis: | With a half-life of 3.85(5) d, the fission product $^{127}\mathrm{Sb}$ is potentially useful for the characterization of fallout debris that would be collected for forensic analysis following a hypothetical nuclear event. The $\ensuremath{\beta}$ decay of $^{127}\mathrm{Sb}$ has many characteristic $\ensuremath{\gamma}$-ray lines, however, the majority of decay strength is concentrated in the three strongest lines near 686, 473, and 784 keV, based on low-precision spectroscopic measurements from decades ago. In a new measurement of $^{127}\mathrm{Sb}\phantom{\rule{4pt}{0ex}}\ensuremath{\beta}$ decay, obtained from radiochemical separations of U photofission products, we show that the energies of the 686 and 784 lines are actually shifted lower by 0.8 and 1.1 keV, respectively. Such large discrepancies in the nuclear data inhibit accurate isotopic analyses and have important implications, for example, on the assessment of fission debris that might be collected in the days following a nuclear event. Therefore, a new evaluation of $^{127}\mathrm{Sb}\phantom{\rule{4pt}{0ex}}\ensuremath{\beta}$ decay and appropriate revisions to the various nuclear databases are warranted. This paper reports a new set of $\ensuremath{\gamma}$-ray energies and relative intensities corresponding to $^{127}\mathrm{Sb}$ decay. |
| Databáze: | OpenAIRE |
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