PT Journal
AU Agramunt, Jea
   Tain, JL
   Albiol, F
   Algora, A
   Domingo-Pardo, C
   Jordan, MD
   Rubio, B
   Tarifeño-Saldivia, A
   Valencia, E
TI Characterization of a neutron-beta counting system with beta-delayed neutron emitters
SO Nuclear Instruments & Methods in Physics Research A
JI Nucl. Instrum. Methods Phys. Res. A
PY 2016
BP 69
EP 78
VL 807
DI 10.1016/j.nima.2015.10.082
LA English
DE Beta-delayed neutron emission probability; Neutron and beta counters; Self-triggered digital data acquisition system; Geant4 simulations
AB A new detection system for the measurement of beta-delayed neutron emission probabilities has been characterized using fission products with well known beta-delayed neutron emission properties. The setup consists of BELEN-20, a 4 pi-neutron counter with twenty He-3 proportional tubes arranged inside a large polyethylene neutron moderator, a thin Si detector for beta 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, beta and beta-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 I-137 was obtained, P-n = 7.76(14)%.
ER