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|Title:||New prompt fission gamma-ray spectral data from 239Pu(nth, f) in response to a high priority request from OECD Nuclear Energy Agency|
|Authors:||GATERA ANGELIQUE; BELGYA T.; GEERTS WOUTER; GÖÖK ALF; HAMBSCH FRANZ-JOSEF; LEBOIS M.; MARÓTI B.; OBERSTEDT STEPHAN; OBERSTEDT A.; POSTELT F.; QI LIQIANG; SZENTMIKLOSI L.; VIDALI MARZIO; ZEISER F.|
|Citation:||EPJ Web of Conferences vol. 146 p. 04020|
|Type:||Articles in periodicals and books|
|Abstract:||Benchmark reactor calculations have revealed an underestimation of γ-heat following fission of up to 28%. To improve the modelling of new nuclear reactors, the OECD/NEA initiated a nuclear data High Priority Request List (HPRL) entry for the major isotopes (235U, 239Pu). In response to that HPRL entry, we executed a dedicated measurement program on prompt fission γ-rays employing state-of-the-art lanthanum bromide (LaBr3) detectors with superior timing and good energy resolution. Our new results from 252Cf(sf), 235U(nth,f) and 241Pu(nth,f) provide prompt fission γ-ray spectra characteristics : average number of photons per fission, average total energy per fission and mean photon energy; all within 2% of uncertainty. We will be presenting the latest results on 239Pu(nth,f), measured at the Budapest Neutron Centre and supported by the CHANDA Trans-national Access Activity, as well as discussing our different published results in comparison to the historical data and what it says about the discrepancy observed in the benchmark calculations.|
|JRC Directorate:||Nuclear Safety and Security|
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