Characterization of a neutron–beta counting system with beta-delayed neutron emitters
Agramunt, J., Tain, J.L., Gómez-Hornillos, M.B., Garcia, A.R., Albiol, F., Algora, A., Caballero-Folch, R., Calviño, F., Cano-Ott, D., Cortés, G., Domingo-Pardo, C., Eronen, T., Gelletly, W., Gorelov, D., Gorlychev, V., Hakala, J., Jokinen, A., Jordan, M.D., Kankainen, A., . . . Valencia, E. (2016). Characterization of a neutron–beta counting system with beta-delayed neutron emitters. Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment, 807, 69-78. https://doi.org/10.1016/j.nima.2015.10.082
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2016Copyright
© 2015 Elsevier B.V. This is a final draft version of an article whose final and definitive form has been published by Elsevier.
A new detection system for the measurement of beta-delayed neutron emission probabilities has been characterized using fission
products with well known β-delayed neutron emission properties. The setup consists of BELEN-20, a 4π neutron counter with
twenty 3He proportional tubes arranged inside a large polyethylene neutron moderator, a thin Si detector for β counting and a selftriggering
digital data acquisition system. The use of delayed-neutron precursors with different neutron emission windows allowed
the study of the effect of energy dependency on neutron, β and β-neutron rates. The observed effect is well reproduced by Monte
Carlo simulations. The impact of this dependency on the accuracy of neutron emission probabilities is discussed. A new accurate
value of the neutron emission probability for the important delayed-neutron precursor 137I was obtained, Pn = 7.76(14)%.
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