In:
EPJ Web of Conferences, EDP Sciences, Vol. 239 ( 2020), p. 18006-
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 235 U 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.
Type of Medium:
Online Resource
ISSN:
2100-014X
DOI:
10.1051/epjconf/202023918006
Language:
English
Publisher:
EDP Sciences
Publication Date:
2020
detail.hit.zdb_id:
2595425-8
Bookmarklink