β -delayed neutron emission studies of I137,138 and Cs144,145 performed with trapped ions

• DOI: 10.1103/physrevc.101.024312
• Publication Date: 2020-02-26T14:57:26Z
• Authors: A. Czeszumska; N. D. Scielzo; S. A. Caldwell; J. A. Clark; G. Savard; B. S. Wang; A. Aprahamian; M. T. Burkey; C. J. Chiara; J. Harker; A. F. Levand; S. T. Marley; G. Morgan; J. M. Munson; E. B. Norman; A. Nystrom; R. Orford; S. W. Padgett; A. Pérez Galván; K. S. Sharma; K. Siegl; S. Y. Strauss
• Keywords: Branching fraction

A detailed study of the $\ensuremath{\beta}$-delayed neutron emission properties $^{137,138}\mathrm{I}$ and $^{144,145}\mathrm{Cs}$ has been performed by confining ions in Beta-decay Paul Trap. The daughter following $\ensuremath{\beta}$ decay emerge from trapped-ion cloud with negligible scattering allowing reconstruction recoil-ion energy time flight. From this information, neutron-emission branching ratios neutron-energy spectra were deduced. results for $^{137}\mathrm{I}$ decays are agreement previous using direct neutron-detection techniques. In case $^{138}\mathrm{I}$, a ratio 6.18(50)% is obtained, yielding value consistent more recent results, which factor two larger than measurements made prior to 1978.