β -delayed-neutron studies of Sb135,136 and I140 performed with trapped ions
/ Authors
B. Wang, S. Caldwell, N. Scielzo, A. Czeszumska, J. Clark, G. Savard, A. Aprahamian, M. Burkey, C. Chiara, J. Harker
and 12 more authors
A. Levand, S. Marley, G. Morgan, J. Munson, E. Norman, A. Nystrom, R. Orford, S. Padgett, A. Pérez Galván, K. Sharma, K. Siegl, S. Strauss
/ Abstract
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.
Journal: Physical Review C