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., . . . 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. doi:10.1016/j.nima.2015.10.082
Published inNuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment
© 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)%.