Beta-delayed-neutron studies of ${}^{135,136}$Sb and ${}^{140}$I performed with trapped ions

Abstract

Beta-delayed-neutron ($\beta$n) spectroscopy was performed using the Beta-decay Paul Trap and an array of radiation detectors. The $\beta$n branching ratios and energy spectra for ${}^{135,136}$Sb and ${}^{140}$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 $\beta$n branching ratios that impact the r-process abundance pattern around the A~130 peak. For ${}^{135,136}$Sb and ${}^{140}$I, $\beta$n branching ratios of 14.6(11)%, 17.6(28)%, and 7.6(28)% were determined, respectively. The $\beta$n energy spectra obtained for ${}^{135}$Sb and ${}^{140}$I are compared with results from direct neutron measurements, and the $\beta$n energy spectrum for ${}^{136}$Sb has been measured for the first time.

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• R-Process Nucleosynthesis in Dynamically Ejected Matter of Neutron Star Mergers
• The impact of individual nuclear properties on $r$-process nucleosynthesis
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Cited by in corpus (3)

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• A decay microscope for trapped neon isotopes
• The Beta-decay Paul Trap Mk IV: Design and commissioning