Measurement of the delayed-neutron multiplicity and time constants in the thermal neutron induced fission of 235U at ILL

Daniela Foligno; Pierre Leconte; Olivier Serot; Benoit Geslot; Grégoire De Izarra; Abdelhazize Chebboubi; Alix Sardet; Maria Diakaki; Pierre Tamagno; Annick Billebaud; François-René Lecolley; Torsten Soldner; Ulli Köster; Paolo Mutti; Alexandra Pepino; Olivier Méplan; Grégoire Kessedjian; Jean-Luc Lecouey; Ludovic Mathieu; Nathalie Marie-Nourry

doi:10.1051/epjconf/202023918006

All issues

Volume 239 (2020)

EPJ Web Conf., 239 (2020) 18006

Abstract

Open Access

Issue		EPJ Web Conf. Volume 239, 2020 ND 2019: International Conference on Nuclear Data for Science and Technology


Article Number		18006
Number of page(s)		5
Section		Integral Experiments
DOI		https://doi.org/10.1051/epjconf/202023918006
Published online		30 September 2020

EPJ Web of Conferences 239, 18006 (2020)
https://doi.org/10.1051/epjconf/202023918006

Measurement of the delayed-neutron multiplicity and time constants in the thermal neutron induced fission of ²³⁵U at ILL

Daniela Foligno¹, Pierre Leconte¹, Olivier Serot¹, Benoit Geslot², Grégoire De Izarra², Abdelhazize Chebboubi¹, Alix Sardet³, Maria Diakaki¹, Pierre Tamagno¹, Annick Billebaud⁴, François-René Lecolley⁶, Torsten Soldner⁵, Ulli Köster⁵, Paolo Mutti⁵, Alexandra Pepino³, Olivier Méplan⁴, Grégoire Kessedjian⁴, Jean-Luc Lecouey⁶, Ludovic Mathieu⁵ and Nathalie Marie-Nourry⁶

¹ CEA, DEN, DER/SPRC/LEPh Cadarache, F-13108 Saint-Paul-lez-Durance, France
² CEA, DEN, DER/SPESI/LP2E Cadarache, F-13108 Saint-Paul-lez-Durance, France
³ CEA, DEN, DER/SPESI/LDCI Cadarache, F-13108 Saint-Paul-lez-Durance, France
⁴ LPSC, Université Grenoble Alpes, F-38000 Grenoble, France
⁵ CENBG, Université de Bordeaux, F-33170 Gradignan, France
⁶ LPC, Université Caen Normandie, F-14000 Caen, France
⁷ Institut Laue-Langevin, F-38042 Grenoble, France

Published online: 30 September 2020

Abstract

Delayed-neutron (DN) data is essential in inherent reactor safety and reactor control since it is needed for the estimation of the reactivity. Nowadays, discrepancies among the data in various international databases (JEFF, ENDF, JENDL) are large and bring excessive conservatism in the safety margins. The ALDEN (Average Lifetime of DElayed Neutrons) experiment, built in a collaboration between CEA and CNRS, aimed at re-measuring the DN data associated with several fissioning systems (average delayed-neutron yield and kinetic parameters). The first experimental campaign consisted in the integral measurement of the DN activity after the irradiation of an ²³⁵U target. It took place under the cold neutron flux of ILL (Institut Laue-Langevin) at the beginning of September 2018, in the PF1b experimental zone (doi:10.1016/j.nima.2006.03.020). The data analysis gave an average DN yield of 1.631E-02(2) DN/fiss and a mean precursors’ half-life of 8.93(9) s. The results are consistent with the literature, but they are affected by one third of the uncertainty.

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