Speaker
Description
Independent fission product yields (FPY), i.e., yields of fission products right after the prompt neutron emission, but before beta decay, are an important piece of data for nuclear fission modeling and fission applications. The Spectrometer for Ion Determination in fission Research (SPIDER), was developed at Los Alamos Neutron Science Center (LANSCE) for measuring FPYs from neutron-induced fission using the 2E-2v method, eventually spanning from thermal up to 20 MeV in incident neutron energy. SPIDER has recently undergone various improvements for increasing the fidelity and resolution of the extracted data. In particular, a gamma-ray tagging system has been implemented for improving the accuracy of the mass calibration by measuring strong gamma-ray transitions from isotopes of known mass. In this presentation, an overview of the upgraded SPIDER system and preliminary results from FPY measurements on $^{252}$Cf(sf), $^{235}$U(n$_{th}$,f), and $^{239}$Pu(n$_{th}$,f) will be discussed.
*This work is supported by the US Department of Energy through the Los Alamos National Laboratory, Contract No. 89233218CNA000001 (LA-UR-21-29666)