New prompt fission gamma-ray spectral data from 239Pu(nth, f) in response to a high priority request from OECD Nuclear Energy Agency
1 European Commission, Joint-Research Centre, Directorate G, Geel, Belgium
2 Extreme Light Infrastructure - Nuclear Physics (ELI-NP) / Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), Bucharest-Magurele, Romania
3 Centre for Energy Research, Hungarian Academy of Sciences, Nuclear Analysis and Radiography Department, Budapest, Hungary
4 Institut de Physique Nucléaire Orsay (IPN-Orsay), Orsay, France
5 Hamburg University, Department of Physics, Hamburg, Germany
6 University of Oslo, Department of Physics, Oslo, Norway
7 Ghent University, Department of Physics, Gent, Belgium
a e-mail: Stephan.email@example.com
Published online: 13 September 2017
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 present preliminary results on 239Pu(nth,f), recently 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.
© The Authors, published by EDP Sciences, 2017
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