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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, H.; Jokinen, A.; Jordan, M.D.; Kankainen, A.; Kolhinen, V.; Kucuk, L.; Martinez, T.; Mason, P.J.R.; Moore, I.; Penttilä, H.; Podolyák, Zs; Pretel, C.; Reponen, M.; Riego, A.; Rissanen, J.; Rubio, B.; Saastamoinen, A.; Tarifeño-Saldivia, A.; Valencia, E.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 01/2016, Letnik: 807Journal Article, Publication
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 self-triggering 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)%.
