Prompt gamma-ray emission from fission of239Pu by resonance neutrons I

Gamma-ray spectra from239Pu(n,f) reaction were measured with the gamma spectrometer on the pulsed reactor IBR-30. The fast 19-section ionization chamber with 1.6 g of239Pu targets was used. The fission gamma-rays within the 32 ns time window were measured using a Ge(Li) detector. Based on the measured gamma-ray spectrum in the (0.1–1.8) MeV interval, the total number of emittedγ-quanta-multiplicity 〈N γ tot 〉 and total energy of γ-quanta per fission event, 〈E γ tot 〉, were calculated. The results were 7.0±0.6γ/fission and 6.8±0.5 MeV/fission respectively.