An ENDF-6 compatible evaluation for neutron induced reactions of 232Th in the unresolved resonance region

Sirakov, I.; Capote, R.; Gunsing, F.; Schillebeeckx, P.; Trkov, A.

doi:10.1016/j.anucene.2007.12.008

Cited by 31 publications

(35 citation statements)

References 32 publications

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“…The transmission coefficient for a capture channel T J π γ was parameterised by [79]: and scattering radius R at zero neutron energy. The scattering radius R and neutron strength functions S =0,1,2 were derived from optical model calculations using the DCCOM potential of Quesada et al [81].…”

Section: Parameterisation Of the σ γ Data Obtained At Gelinamentioning

confidence: 99%

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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Section: Parameterisation Of the σ γ Data Obtained At Gelinamentioning

confidence: 99%

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

et al. 2016

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“…9. shows the results for the 232 Th(n,γ) surrogate method compared to the ENDFB7 database which is based on recent accurate measurements from both n_TOF [18] and GELINA [19,20]. In the range 500 keV -1 MeV there is very good agreement with variations typically of the order of 15%.…”

Section: Resultsmentioning

confidence: 54%

Indirect (n,γ) cross sections of thorium cycle nuclei using the surrogate method

et al. 2012

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Indirect neutron capture (n,γ) cross sections have been extracted for the key thorium cycle nuclei 232 Th, 231 Pa and 230 Th using the surrogate reaction method. Final nucleus gamma decay probabilities were measured between the neutron binding energy and around 1MeV above it using the 232 Th(d,p) 233 Th, 232 Th( 3 He,t) 232 Pa and 232 Th( 3 He,α) 231 Th reactions in experiments with the Cactus gamma-detector array and Silicon Ring charged particle detectors at the Oslo Cyclotron Laboratory. Since the neutron capture cross section for 232 Th is already well known from direct measurements a comparison with these results provides a stringent test of the applicability of the surrogate method in the actinide region for indirect (n,γ) cross section measurements. In addition, a new technique for correcting measured gamma ray decay probabilities below the neutron emission energy threshold is proposed and used. We find good agreement between indirect and direct (n,γ) cross section measurements in the range 500 keV -1 MeV, but large discrepancies outside this range. Explanations for the observed differences are proposed. PACS number(s): 24.87.+y, 24.10.-i, 25.45.-z, 25.55.-e

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“…[120] for the resolved, and ref. [121] for the unresolved resonance region. The time path between a measurement and the inclusion in an evaluation for an evaluated nuclear data library is in general rather capricious.…”

Section: Further Use Of N Tof Measurementsmentioning

confidence: 99%

Nuclear data activities at the n_TOF facility at CERN

et al. 2016

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Abstract. Nuclear data in general, and neutron-induced reaction cross sections in particular, are important for a wide variety of research fields. They play a key role in the safety and criticality assessment of nuclear technology, not only for existing power reactors but also for radiation dosimetry, medical applications, the transmutation of nuclear waste, accelerator-driven systems, fuel cycle investigations and future reactor systems as in Generation IV. Applications of nuclear data are also related to research fields as the study of nuclear level densities and stellar nucleosynthesis. Simulations and calculations of nuclear technology applications largely rely on evaluated nuclear data libraries. The evaluations in these libraries are based both on experimental data and theoretical models. Experimental nuclear reaction data are compiled on a worldwide basis by the international network of Nuclear Reaction Data Centres (NRDC) in the EXFOR database. The EXFOR database forms an important link between nuclear data measurements and the evaluated data libraries. CERN's neutron time-of-flight facility n TOF has produced a considerable amount of experimental data since it has become fully operational with the start of the scientific measurement programme in 2001. While for a long period a single measurement station (EAR1) located at 185 m from the neutron production target was available, the construction of a second beam line at 20 m (EAR2) in 2014 has substantially increased the measurement capabilities of the facility. An outline of the experimental nuclear data activities at CERN's neutron time-of-flight facility n TOF will be presented.

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An ENDF-6 compatible evaluation for neutron induced reactions of 232Th in the unresolved resonance region

Cited by 31 publications

References 32 publications

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

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

Indirect (n,γ) cross sections of thorium cycle nuclei using the surrogate method

Nuclear data activities at the n_TOF facility at CERN

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