International Conference on Nuclear Data for Science and Technology 2010
J. Korean Phys. Soc. 59, 1573-1576
Paper ID: ND-1103
DOI: 10.3938/jkps.59.1573
PACS: 29.40.-n, 29.20.Hm
Monte Carlo Simulations for the Study of a Moderated Neutron Detector
M. B. Gomez Hornillos1, V. Gorlychev1, J. L. Tain2, A. Algora2, J. Agramunt2, D. Cano-Ott3, T. Martinez3, E. Mendoza3, R. Caballero1, J. Rissanen4, J. Aysto4, A. Jokinen4, T. Eronen4, I. Moore4, H. Penttila4, G. Cortes1, A. Poch1, C. Pretel1 and F. Calvino1
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 90x90x80cm3 and 20 cylindrical 3He gas counters. The results of these simulations have been validated experimentally with a 252Cf 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 88Br, 94,95Rb and 138I 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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