PT Journal AU n_TOF Collaboration (Wright, Tea Domingo-Pardo, C Tain, JL TI Measurement of the prompt fission γ-rays from slow neutron-induced fission of 235U with STEFF SO European Physical Journal A JI Eur. Phys. J. A PY 2024 BP 70 - 11pp VL 60 IS 3 DI 10.1140/epja/s10050-024-01277-8 LA English AB The amount of energy carried by gamma-rays during the fission process is an important consideration when developing new reactor designs. Many studies of gamma-ray energy and multiplicity, from a multitude of fissioning systems, were measured during the 1970s. However the data from such experiments largely underestimates the heating effect caused by gamma-rays in the structure of a reactor. It is therefore essential to obtain more accurate measurements of the energy carried during gamma-ray emission. As such, the OECD Nuclear Energy Agency has put out a high priority request [1] for measurements of the mean gamma-ray energy and multiplicity to an accuracy better than 7.5 percent from several fissioning systems; including U-235(n(thermal)). Measurements of the rays from these fissioning nuclei were performed with the SpecTrometer for Exotic Fission Fagments (STEFF). ER