Prompt Gamma Rays Emitted in the Thermal-Neutron-Induced Fission ofU235

Prompt fissionγ-rays from the reactions252Cf(SF) and235U(nth, f) – new data

“…The mean value and the standard deviation of mean has been drawn from the data collected with the three most left detectors and are indicated by the full and dashed lines, respectively. Also shown are different historical data [5,6,22], the evaluated data from ENDF/B-VII.1 and two different model calculations [25,26]. Looking at the total released -ray energy all experimental data compare quite well.…”

“…02003-p.3 [5] 7.80 ± 0.30 0.88 ± 0.04 6.84 ± 0.30 Pleasonton et al [6] 8.32 ± 0.40 0.85 ± 0.06 7.06 ± 0.35 Chyzh et al [13] 8.14 ± 0. . Recent results from model calculations [24] are shown as well (dashed-dotted black line).…”

“…Fission 2013 Verbinski (1973) [5], Pleasonton (1972) [6], and Peelle (1971) [22], respectively, and values from ENDF/B-VII.1 [23] as well as results from recent Monte Carlo Hauser Feshbach calculations by Becker (2013) [25] and Regnier (2013) [26]. Values averaged over the results obtained with the first three detectors and their uncertainties are displayed as full drawn and dashed lines, respectively.…”

“…Therefore, we started with studying the spontaneous fission of 252 Cf. Since this reaction has been measured both in the early 1970's by Verbinski et al [5] and Pleasonton et al [6], as well as very recently by Chyzh et al with the DANCE spectrometer at Los Alamos National Laboratory [13], it serves as excellent proof of principle. The spectral data from our recent measurements are published in Refs.…”

“…Therefore, these two isotopes have been included in the OECD Nuclear Energy Agency high priority request list for prompt fission -rays data, in particular new values for -multiplicity and mean energy [4] are requested. The data in the evaluated data tables for both isotopes relies on results that were EPJ Web of Conferences measured in the early 1970's [5,6], and was recently confirmed by Kwan et al [7]. Hence, it might be more likely that the underestimation comes from the isotopes 238 U(n,f) and 241 Pu(n,f), which are always produced in a reactor [8].…”