Abstract
The effect of photoneutrons on the kinetics of the PIK reactor is analyzed and the effective photoneutron fraction and value are calculated. The contribution of various nuclear precursors of high-energy delayed γ rays ‐ fission products ‐ to photoneutron production is determined. The nucleus 140 La makes the main contribution to photoneutron production at long times after the PIK reactor stops operating. The intensity of the effective neutron source (based on photoneutrons) as a function of the time after the reactor stops is determined. The PIK high-flux reactor, intended for scientific research, is now under construction at the St. Petersburg Institute for Nuclear Physics. Its design includes a reflector [1] with volume approximately 8.5 m 3 heavy water, surrounding a compact core. High-energy γ-rays generated in the core can result in fission of deuterium in the reflector with a free neutron being formed:
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