(n,xn<i>γ</i>) reaction cross section measurements for (n,xn) reaction studies

Kerveno, M.; Bacquias, A.; Borcea, C.; Dessagne, P.; Drohé, Jean-Claude; Nankov, N.; Nyman, M.; Negreţ, A.; Plompen, A.; Rouki, C.; Rudolf, G.; Stănoiu, M.; Thiry, Jean-Claude

doi:10.1051/epjconf/20134201005

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…Table I With the 235 U sample, for example, only 4 transitions (one for the (n, n') channel, three for the (n, 2n) channel) could be studied because of the high radioactivity and neutron induced fission background. A better agreement between experimental data and calculation has been found for phenomenological entrance channels models [14], [15], [16], [5].…”

Section: G Studied Systems and Impact On Theoriesmentioning

confidence: 74%

“…For the isotope 238 U, 35 (n, n'γ) transitions were studied, with varying degrees of agreement with calculations [15], [16]. The study of 238 U is challenged by the difficulty to extract a cross section for the transition from the first excited state to the ground state, with an energy of 45 keV, that is Examples of results obtained with GRAPhEME for 235 U.…”

Section: G Studied Systems and Impact On Theoriesmentioning

confidence: 99%

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GRAPhEME: A setup to measure (n, xnγ) reaction cross sections

Henning

Bacquias

Dessagne

et al. 2015

2015 4th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and Their Applications (ANIMMA

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Most of nuclear reactor developments are using evaluated data base for numerical simulations. However, the considered databases present still large uncertainties and disagreements. To improve their level of precision, new measurements are needed, in particular for (n, xn) reactions, which are of great importance as they modify the neutron spectrum, the neutron population, and produce radioactive species.In 2003, the IPHC group started an experimental program to measure (n, xnγ) reaction cross sections using prompt gamma spectroscopy and neutron energy determination by time of flight. Measurements of (n, xnγ) cross section have been performed for 235,238 U, 232 Th, nat,182,183,184,186 W, nat Zr.The experimental setup, consisting of HPGe detectors and a fission chamber, is installed at the neutron beam at GELINA (Institute for Reference Materials and Measurements (IRMM), Geel, Belgium). It has recently been upgraded with the addition of a highly segmented 36 pixels planar HPGe detector. The setup is equipped with a high rate digital acquisition system. The analysis of the segmented detector data requires a specific procedure to account for cross signals between pixels. An overall attention is paid to the precision of the measurement.The setup characteristic and the analysis procedure will be presented along with the acquisition and analysis challenges. Examples of results and their impact on models will be discussed. Finally, the perspectives on complimentary experiments will be presented.

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Section: G Studied Systems and Impact On Theoriesmentioning

confidence: 74%

Section: G Studied Systems and Impact On Theoriesmentioning

confidence: 99%

GRAPhEME: A setup to measure (n, xnγ) reaction cross sections

Henning

Bacquias

Dessagne

et al. 2015

2015 4th International Conference on Advancements in Nuclear Instrumentation Measurement Methods and Their Applications (ANIMMA

View full text Add to dashboard Cite

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“…The nat W target had a thickness of 0.2 mm, or 0.385 g/cm 2 . The isotopic targets were enriched to 90% of the isotope of interest, with thickness from 1.1 to 1.4 g/cm 2 and a density of 10.6 g/cm 3 .…”

Section: Methodsmentioning

confidence: 99%

“…Among those, (n, xn) reactions are of great importance for the operation of reactors as they modify the neutron spectrum and produce radioactive species. The group at IPHC started a program to study (n, xnγ ) reactions on actinides in 2005 and already worked on 235,238 U and 232 Th [3][4][5][6], while measurements for other elements were performed and are being analyzed, including nat W. Tungsten is not an active element in nuclear reactors, but, because of its chemical and mechanical properties [7], it is used in many alloys. The interaction of neutrons with W is therefore of importance for reactor physics.…”

Section: Introductionmentioning

confidence: 99%

Measurement of (n,xnγ) reaction cross sections in W isotopes

et al. 2017

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Abstract. Evaluated nuclear data bases currently used for numerical simulation for the development of nuclear reactors still present large uncertainties. Their improvement is necessary, in particular through better reaction models and nuclear data. Among the reactions of interest, (n, xn) reactions are of great importance for the operation of a reactor as they modify the neutron spectrum, the neutron population, and produce radioactive species. Experimental data on (n, xnγ ) reaction provide strong constraints on nuclear reaction mechanism theories. Tungsten isotopes -which are deformed like actinides but do not fission -are of interest to test the models.182,184,186 W(n, xnγ ) cross sections are measured; results are compared with model calculations by TALYS, EMPIRE and CoH codes.

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“…Up to now, four measurements campaigns have been managed on actinides. The first one was carried out with a 235 U sample [7] followed by 232 Th [8] and 238 U [9] samples. Currently, a 233 U sample is on the beam, monitored by an updated version of GRAPhEME which includes a segmented Germanium detector [10].…”

Section: Introductionmentioning

confidence: 99%

(n,xnγ) cross sections on actinides versus reaction code calculations

et al. 2017

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Abstract. The experimental setup GRAPhEME (GeRmanium array for Actinides PrEcise MEasurements) has been used at GELINA (EC-JRC, Geel, Belgium) to perform (n,xn γ ) cross sections measurements. GRAPhEME has been especially designed to take into account the specific difficulties generated by the use of actinides samples. This work takes place in the context of new nuclear data measurements for nuclear reactor applications. Considering the very tight accuracy requested for new experimental data, special care has been paid to quantify as accurately as possible all the uncertainties from the instruments and the analysis procedure. From the precise (n,xn γ ) cross sections produced with GRAPhEME, the use of model calculations is required to obtain (n,xn) cross sections. Beyond the measurements, extensive work on theoretical models is necessary to achieve a better evaluation of the (n,xn) processes. In this paper, we will discuss the final step of the 238 U data analysis and present some recent results obtained on 232 Th compared to TALYS modellings. A new measurement campaign on 233 U has started recently, a first assessment of the recorded data will be presented.

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(n,xnγ) reaction cross section measurements for (n,xn) reaction studies

Cited by 6 publications

References 7 publications

GRAPhEME: A setup to measure (n, xnγ) reaction cross sections

GRAPhEME: A setup to measure (n, xnγ) reaction cross sections

Measurement of (n,xnγ) reaction cross sections in W isotopes

(n,xnγ) cross sections on actinides versus reaction code calculations

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