International Conference on Nuclear Data for Science and Technology 2010 | |||||
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Monte Carlo Simulations for the Study of a Moderated Neutron Detector | |||||
M. B. Gomez Hornillos^{1}, V. Gorlychev^{1}, J. L. Tain^{2}, A. Algora^{2}, J. Agramunt^{2}, D. Cano-Ott^{3}, T. Martinez^{3}, E. Mendoza^{3}, R. Caballero^{1}, J. Rissanen^{4}, J. Aysto^{4}, A. Jokinen^{4}, T. Eronen^{4}, I. Moore^{4}, H. Penttila^{4}, G. Cortes^{1}, A. Poch^{1}, C. Pretel^{1} and F. Calvino^{1} | |||||
^{1} Seccio d’Enginyeria Nuclear & INTE, Universitat Politecnica de Catalunya, 08028, Barcelona, Spain ^{2} IFIC, CSIC-Univ. Valencia, Valencia, Spain ^{3} CIEMAT-Madrid, Spain ^{4} JYFL, Jyvaskyla, Finland | |||||
Abstract | |||||
This work presents the Monte Carlo simulations performed with the MCNPX and GEANT4 codes for the design of a BEta deLayEd Neutron detector, BELEN-20. This detector will be used for the study of beta delayed neutron emission and consists of a block of polyethylene with dimensions 90x90x80cm^{3} and 20 cylindrical ^{3}He gas counters. The results of these simulations have been validated experimentally with a ^{252}Cf source in the laboratory at UPC, Barcelona. Also the ﬁrst experiment with this detector has been carried out in November 2009 in JYFL, Finland. In this experiment the neutron emission probability after beta decay of the ﬁssion products ^{88}Br, ^{94,95}Rb and ^{138}I has been measured; this data is still under analysis. Simulations with MCNPX and GEANT4 have been performed in order to obtain the eﬃciency of the BELEN-20 detector for each of the above nuclei using the neutron energy distribution corresponding to each nucleus. | |||||
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