Neutron capture cross sections of Hf178 leading to Hfm2179
| Autor: | Kenneth S. Krane |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Physical Review C. 99 |
| ISSN: | 2469-9993 2469-9985 |
| DOI: | 10.1103/physrevc.99.054311 |
| Popis: | Cross sections for radiative neutron capture have been measured for the formation of 25-d $^{179}\mathrm{Hf}^{{m}_{2}}$ (${J}^{\ensuremath{\pi}}=25/{2}^{+}$) using targets of enriched $^{178}\mathrm{Hf}$. Based on irradiations using pure epithermal neutrons as well as mixed thermal + epithermal neutrons, the thermal cross section has been determined to be $\ensuremath{\sigma}=6(5)\phantom{\rule{0.16em}{0ex}}\ensuremath{\mu}\mathrm{b}$ and the resonance integral $I=1.63(5)\phantom{\rule{0.16em}{0ex}}\mathrm{mb}$. To enhance the determination of the cross sections, the energies and intensities of the $\ensuremath{\gamma}$ rays from the decay of $^{179}\mathrm{Hf}^{{m}_{2}}$ have been re-determined with improved precision. The half-life of $^{179}\mathrm{Hf}^{{m}_{2}}$ has been measured to be 24.91(27) d, in agreement with the previously accepted value. The analysis of the $^{179}\mathrm{Hf}^{{m}_{2}}$ decay required more precise spectrometry on competing $\ensuremath{\gamma}$ rays from the decay of $^{181}\mathrm{Hf}$, whose results are presented (along with that of the decay of $^{175}\mathrm{Hf}$) from irradiation of a source of natural Hf. The measured cross sections are compared with those of other high-spin neutron captures. |
| Databáze: | OpenAIRE |
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