GRAPhEME: a setup to measure (n, xn γ) reaction cross sections

Conference · Wed Jul 01 00:00:00 EDT 2015

OSTI ID:22531460

Henning, Greg; Bacquias, A.; Capdevielle, O.; Dessagne, P.; Kerveno, M.; Rudolf, G. ^[1]; Borcea, C.; Negret, A.; Olacel, A. ^[2]; Drohe, J. C.; Plompen, A. J.M.; Nyman, M. ^[3]

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1. Universite de Strasbourg, IPHC, 23 rue du Loess 67037 Strasbourg (France)
2. Nat. Inst. Of Phys. And Nucl. Eng., Bucharest (Romania)
3. EU/ JRC-IRMM, Geel (Belgium)

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. The IPHC group started an experimental program to measure (n, xn gamma) reaction cross sections using prompt gamma spectroscopy and neutron energy determination by time of flight. Measurements of (n, xn gamma) cross section have been performed for {sup 235,238}U, {sup 232}Th, {sup nat,182,183,184,186}W, {sup nat}Zr. The experimental setup is installed at the neutron beam at GELINA (Geel, Belgium). The setup has recently been upgraded with the addition of a highly segmented 36 pixels planar HPGe detector. Significant efforts have been made to reduce radiation background and electromagnetic perturbations. 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. (authors)

• Research Organization: Institute of Electrical and Electronics Engineers - IEEE, 3 Park Avenue, 17th Floor, New York, N.Y. 10016-5997 (United States)
• OSTI ID: 22531460
• Report Number(s): ANIMMA-2015-IO-78; TRN: US16V0411102401
• Resource Relation: Conference: ANIMMA 2015: 4. International Conference on Advancements in Nuclear Instrumentation Measurement Methods and their Applications, Lisboa (Portugal), 20-24 Apr 2015; Other Information: Country of input: France; 22 Refs.
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCURACY
COMPUTERIZED SIMULATION
CROSS SECTIONS
DATA ACQUISITION
DATA ACQUISITION SYSTEMS
GAMMA SPECTROSCOPY
HIGH-PURITY GE DETECTORS
NEUTRON BEAMS
NEUTRON REACTIONS
NEUTRON SPECTRA
NEUTRONS
PHOTONUCLEAR REACTIONS
THORIUM 232 TARGET
TIME-OF-FLIGHT METHOD
TUNGSTEN 182 TARGET
TUNGSTEN 183 TARGET
TUNGSTEN 186 TARGET
URANIUM 235 TARGET
URANIUM 238 TARGET
ZIRCONIUM ISOTOPES