Measurements of delayed neutron yields from thermal neutron induced fission of (sup 235)U, (sup 233)U, (sup 239)Pu, and (sup 237)Np

摘要

The experimental results on delayed neutron (DN) yields from thermal neutron induced fission of some actinides on the IBR-2 pulsed reactor are presented. A method of periodic irradiation without displacement of the sample was used. Precise measurements of decay curves in the time interval of 5-350 ms for (sup 235)U and (sup 239)Pu were performed. The measurements of DN total yields in thermal neutron induced fission of (sup 239)Pu, (sup 233)U, and (sup 237)Np and in cold neutron induced fission of (sup 235)U, (sup 233)U, and (sup 239)Pu were carried out. All values were obtained using the value of (beta)(sub 0) for (n(sub th) + (sup 235)U) as a standard 26 refs., 7 figs., 4 tabs.