Electron-capture-delayed fission properties ofAm232
| Autor: | N. J. Hannink, S. A. Kreek, R. B. Chadwick, B. Kadkhodayan, P. A. Baisden, Matti Nurmia, Diana Lee, Kenneth E. Gregorich, R. A. Henderson, Howard L. Hall, K. R. Czerwinski, C. M. Gannett, Darleane C. Hoffman, C. E. A. Palmer, J. D. Leyba |
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| Rok vydání: | 1990 |
| Předmět: | |
| Zdroj: | Physical Review C. 42:1480-1488 |
| ISSN: | 1089-490X 0556-2813 |
| Popis: | Delayed fission from the electron-capture decay of $^{232}\mathrm{Am}$ was studied. The $^{237}\mathrm{Np}$(\ensuremath{\alpha},9n${)}^{232}$Am reaction with multiple $^{237}\mathrm{Np}$ targets was used to produce $^{232}\mathrm{Am}$. The fission properties and half-life of $^{232}\mathrm{Am}$ were measured using a rotating-wheel system. The half-life of $^{232}\mathrm{Am}$ was found to be 1.31\ifmmode\pm\else\textpm\fi{}0.04 min from measurements of the fission activity. A highly asymmetric mass-yield distribution was observed for the fission activity, and the average total kinetic energy of the fission fragments was found to be 174\ifmmode\pm\else\textpm\fi{}5 MeV. Radiochemical separations confirmed the elemental assignment of the fissioning species to americium or fission following shortly after the decay of americium. The cross section for $^{232}\mathrm{Am}$ produced by this reaction and decaying by electron capture was determined to be 1.3\ifmmode\pm\else\textpm\fi{}0.2 \ensuremath{\mu}b by measuring the intensities of the daughter plutonium K x rays in radiochemically separated americium samples. The delayed-fission probability was found to be (6.9\ifmmode\pm\else\textpm\fi{}1.0)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$ from the measured ratio of fissions to plutonium K x rays. The observed fissions were unambiguously assigned to electron-capture-delayed fission of americium by measuring the time correlation between the plutonium K x rays resulting from americium K capture and the subsequent fission. |
| Databáze: | OpenAIRE |
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