β-delayed-neutron studies ofSb135,136andI140performed with trapped ions
| Autor: | N. D. Scielzo, A. Nystrom, A. Perez Galvan, A. F. Levand, J. Munson, J. L. Harker, K. Siegl, Guy Savard, M. T. Burkey, C. J. Chiara, G.E. Morgan, S. W. Padgett, S. T. Marley, B. S. Wang, Jason A. Clark, Ani Aprahamian, R. Orford, Eric B. Norman, A. Czeszumska, Shane Caldwell, K. S. Sharma, S. Strauss |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review C. 101 |
| ISSN: | 2469-9993 2469-9985 |
| Popis: | Beta-delayed-neutron ($\ensuremath{\beta}n$) spectroscopy was performed using the Beta-decay Paul Trap and an array of radiation detectors. The $\ensuremath{\beta}n$ branching ratios and energy spectra for $^{135,136}\mathrm{Sb}$ and $^{140}\mathrm{I}$ were obtained by measuring the time of flight of recoil ions emerging from the trapped ion cloud. These nuclei are located at the edge of an isotopic region identified as having $\ensuremath{\beta}n$ branching ratios that impact the $r$-process abundance pattern around the $A\ensuremath{\approx}130$ peak. For $^{135,136}\mathrm{Sb}$ and $^{140}\mathrm{I}, \ensuremath{\beta}n$ branching ratios of $14.6(13)%, 17.6(29)%$, and $7.6(28)%$ were determined, respectively. The $\ensuremath{\beta}n$ energy spectra obtained for $^{135}\mathrm{Sb}$ and $^{140}\mathrm{I}$ are compared with results from direct neutron measurements, and the $\ensuremath{\beta}n$ energy spectrum for $^{136}\mathrm{Sb}$ has been measured for the first time. |
| Databáze: | OpenAIRE |
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