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.
Highlights
Actinides PrEcise MEasurements) has been developed at the white neutron beam facility GELINA (GEel LINear Accelerator) operated by the European Commission - Joint Research Center at Geel in Belgium [5, 6]
A 233U sample is on the beam, monitored by an updated version of GRAPhEME which includes a segmented Germanium detector [10]
The status of the final analysis of the 238U is discussed and new preliminary results on thorium compared to TALYS calculations are presented
Summary
Actinides PrEcise MEasurements) has been developed at the white neutron beam facility GELINA (GEel LINear Accelerator) operated by the European Commission - Joint Research Center at Geel in Belgium [5, 6]. Four measurements campaigns have been managed on actinides. A 233U sample is on the beam, monitored by an updated version of GRAPhEME which includes a segmented Germanium detector [10]. An overall description of the installation is given in the second section and more details can be found in Ref. The status of the final analysis of the 238U is discussed and new preliminary results on thorium compared to TALYS calculations are presented. The fourth section highlights the updates of the GRAPhEME setup illustrated by first assessments of the recorded data on 233U.
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