Measurements of Neutron Photoproduction Cross Sections for ~232Th and ~238U Using Capture Gamma Rays

摘要

Neutron photoproduction studies for ~232Th and ~238U were carried out from 5.61 to 10.83 MeV, by using up to 30 neutron captue gamma rays with high resolution in energy (4 to 20 eV), produced in an experimental arrangement at the IPEN-IEA-R12-MW research reactor. Samples of U~3O_8 depleted to 0.34/100 in ~235U and nautral ThO_2 were irradiated inside a 4π sr long-counter neturon detector system, 520.5 cm away from the capture target.