General ILL seminar
organised by College 3
Monday, 26 May 2025 at 13h30
Seminar room 110-111, ILL 50, 1st floor
Zoom link:https://ill.zoom.us/j/98964195699?pwd=vPhNT17CAeoDUr7QX4PjfyPnWsHuMU.1
Password:SeminarC3
----------------
“High-precision measurements of Prompt Fission Neutron Spectra and average neutron multiplicities”
Benoît Mauss CEA, Benoit.MAUSS@cea.fr
As a source of neutrons within the nuclear chain reaction, prompt fission neutrons are of decisive importance for applications. The neutron multiplicity impacts the amount of neutrons available for further fissions, and therefore the so-called criticality calculations, while the prompt neutron energy distribution impacts the probability for neutrons to escape the core and the amount of damages they can cause to the vessel, reducing the reactors lifetime. The fission process is very complex so that the use of theoretical models for the prediction of the fission neutron energies and multiplicities to the level of accuracy and precision required by applications is difficult. Instead, phenomenological models need to be used but, as they rely heavily on the data, are limited by the data’s uncertainties.
In recent years, incentives from the nuclear data community have led to the development of new neutron detection arrays for precise measurements of prompt fission neutron spectra (PFNS), such as the VErsatile Neutron DETector Array. High-precision measurements performed at the Los Alamos Neutron Science Center as a function of neutron incoming energy by the double time-of-flight technique will be presented. It provides PFNS for incoming neutron energies between 1 and 600 MeV. Some of the recent results obtained on PFNS and average neutron multiplicity measurements will be shown.
Hanno Filter (College 3 Secretary)