A detailed study of the β-delayed neutron emission properties of I137,138 and Cs144,145 has been performed by confining ions in the Beta-decay Paul Trap. The daughter ions following β decay emerge from the trapped-ion cloud with negligible scattering allowing reconstruction of the recoil-ion energy from the time of flight. From this information, the neutron-emission branching ratios and neutron-energy spectra were deduced. The results for the I137 and Cs144,145 decays are in agreement with previous results performed using direct neutron-detection techniques. In the case of I138, a branching ratio of 6.18(50)% is obtained, yielding a value consistent with the more recent results, which are a factor of two larger than measurements made prior to 1978.
Publication Source (Journal or Book title)
Physical Review C
Czeszumska, A., Scielzo, N., Caldwell, S., Clark, J., Savard, G., Wang, B., Aprahamian, A., Burkey, M., Chiara, C., Harker, J., Levand, A., Marley, S., Morgan, G., Munson, J., Norman, E., Nystrom, A., Orford, R., Padgett, S., Pérez Galván, A., Sharma, K., Siegl, K., & Strauss, S. (2020). β-delayed neutron emission studies of i 137,138 and Cs 144,145 performed with trapped ions. Physical Review C, 101 (2) https://doi.org/10.1103/PhysRevC.101.024312