Experimental study on determination of 235U fission number with delayed neutron detection method

The delayed neutron is emitted after one fission product generated. A new method evaluating fission number by the measurement of delayed neutron number is needed to be verified by experiment. 235U samples were irradiated with MNPR at CIAE, the delayed neutrons were measured with 3He proportional detector and the fission number was determined. The result was verified by delayed γ method. The delayed neutron method is a supplementary way for delayed γ method.