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A study of the construction of the correlation matrix of 241Pu(nth,f) isobaric fission yields

Two blind analyses for 241Pu(nth,f) isobaric fission yields have been conducted, one analysis using a mix of a Monte-Carlo and an analytical method, the other one relying only on analytical calculations. The calculations have been derived from the same analysis path and experimental data, obtained on the LOHENGRIN mass spectrometer at the Institut Laue-Langevin. | A study of the construction of the correlation matrix of 241Pu nth f isobaric fission yields EPJ Nuclear Sci. Technol. 4 25 2018 Nuclear Sciences S. Julien-Laferrière et al. published by EDP Sciences 2018 amp Technologies https doi.org 10.1051 epjn 2018036 Available online at https www.epj-n.org REGULAR ARTICLE A study of the construction of the correlation matrix of 241Pu nth f isobaric fission yields Sylvain Julien-Laferrière1 2 Abdelaziz Chebboubi1 Grégoire Kessedjian2 and Olivier Serot1 1 CEA DEN DER SPRC 13108 Saint-Paul-Lez-Durance France 2 LPSC Université Grenoble-Alpes CNRS IN2P3 38026 Grenoble France Received 6 December 2017 Received in final form 20 March 2018 Accepted 25 May 2018 Abstract. Two blind analyses for 241Pu nth f isobaric fission yields have been conducted one analysis using a mix of a Monte-Carlo and an analytical method the other one relying only on analytical calculations. The calculations have been derived from the same analysis path and experimental data obtained on the LOHENGRIN mass spectrometer at the Institut Laue-Langevin. The comparison between the two analyses put into lights several biases and limits of each analysis and gives a comprehensive vision on the construction of the correlation matrix. It gives confidence in the analysis scheme used for the determination of the fission yields and their correlation matrix. 1 Introduction DA A 1 400 . A double ionization chamber with a Frisch grid similar to the one used in 10 is used to Nuclear fission yields are key parameters for understanding measure the count rate N A t Ek q . The entire heavy the fission process 1 and to evaluate reactor physics peak region has been measured as well as a significant quantities such as decay heat 2 . Despite a sustained effort number of light masses. allocated to fission yields measurements and code develop- The analysis scheme for the high yields region1 85 111 ment the recent evaluated libraries JEFF-3.3 3 ENDF for the light masses and 130 151 for the heavy