Evaluation of the Unresolved Resonance Range of<sup>238</sup>U +<i>n</i>, Part II: Differential Data Tests

Fröhner, F. H.

doi:10.13182/nse92-a15487

Cited by 7 publications

(12 citation statements)

References 7 publications

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“…A similar evaluation was performed by Maslov et al [16] and Courcelle et al [17]. The capture cross section of Fröhner [14,15], which is strongly based on the data of Kazakov et al [18], is in good agreement with the one of Carlson et al [19]. The latter was derived from a least squares adjustment to experimental data available in the literature using the generalised least squares code GMA developed by Poenitz [20] and named after Gauss, Markov, Aitken.…”

Section: Introductionmentioning

confidence: 73%

“…The capture cross sections derived by de Saussure et al [5] and Macklin et al [6], which were the only capture data used in the evaluation of Derrien et al [8], strongly deviate from the one of Carlson et al [19] and Fröhner [14,15]. Therefore, they were not included in the evaluation of Fröhner [14,15] and Courcelle et al [17]. A more extended discussion on the status of evaluated data files for 238 U in the resonance region is reported by Kopecky et al [24].…”

Section: Introductionmentioning

confidence: 94%

“…The σ γ obtained in this work is in very good agreement with the cross section recommended in JEF-2.2. The latter is based on the analysis of Moxon et al [2] in the RRR and the one of Fröhner [14,15] in the URR. The separation between RRR and URR in this evaluation is at 10 keV.…”

Section: Experimental σ γ Data Obtained At Gelinamentioning

confidence: 99%

“…They refer to the evaluation of Fröhner, which is described in detail in refs. [14,15]. This evaluation is based on an analysis of experimental data using the Hauser-Feshbach theory with width fluctuations.…”

Section: Introductionmentioning

confidence: 99%

“…[23], included: 11 absolute 238 U(n, γ), 2 shape 238 U(nγ), 2 absolute 238 U(n, γ)/ 6 Li(n, α) ratio, 5 absolute 238 U(n, γ)/ 10 B(n, α 1 ) ratio, 4 shape 238 U(n, γ)/ 10 B(n, α 1 ) ratio, 4 absolute 238 U(n, γ)/ 10 B(n, α) ratio, 9 absolute 238 U(n, γ)/ 197 Au(n, γ) ratio, 1 shape 238 U(n, γ)/ 197 Au(n, γ) ratio, 5 absolute 238 U(n, γ)/ 235 U(n, f) ratio, 6 shape 238 U(n, γ)/ 235 U(n, f) ratio and 1 shape 238 U (n, γ)/ 239 Pu(n, f) ratio measurements. The capture cross sections derived by de Saussure et al [5] and Macklin et al [6], which were the only capture data used in the evaluation of Derrien et al [8], strongly deviate from the one of Carlson et al [19] and Fröhner [14,15]. Therefore, they were not included in the evaluation of Fröhner [14,15] and Courcelle et al [17].…”

Section: Introductionmentioning

confidence: 99%

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Neutron capture cross section measurements for 238U in the resonance region at GELINA

et al. 2016

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Abstract. Measurements were performed at the time-of-flight facility GELINA to determine the 238 U(n, γ) cross section in the resonance region. Experiments were carried out at a 12.5 and 60 m measurement station. The total energy detection principle in combination with the pulse height weighting technique was applied using C 6D6 liquid scintillators as prompt γ-ray detectors. The energy dependence of the neutron flux was measured with ionisation chambers based on the 10 B(n, α) reaction. The data were normalised to the isolated and saturated 238 U resonance at 6.67 eV. Special procedures were applied to reduce bias effects due to the weighting function, normalization, dead time and background corrections, and corrections related to the sample properties. The total uncertainty due to the weighting function, normalization, neutron flux and sample characteristics is about 1.5%. Resonance parameters were derived from a simultaneous resonance shape analysis of the GELINA capture data and transmission data obtained previously at a 42 m and 150 m station of ORELA. The parameters of resonances below 500 eV are in good agreement with those resulting from an evaluation that was adopted in the main data libraries. Between 500 eV and 1200 eV a systematic difference in the neutron width is observed. Average capture cross section data were derived from the experimental capture yield in the energy region between 3.5 keV and 90 keV. The results are in good agreement with an evaluated cross section resulting from a least squares fit to experimental data available in the literature prior to this work. The average cross section data derived in this work were parameterised in terms of average resonance parameters and included in a least squares analysis together with other experimental data reported in the literature.

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