Filters
Results 1 - 1 of 1
Results 1 - 1 of 1.
Search took: 0.015 seconds
Brusegan, A.; Schillebeeckx, P.; Lobo, G.; Borella, A.; Volev, K.; Janeva, N.
Evaluated nuclear data for Th-U fuel cycle. Summary report2003
Evaluated nuclear data for Th-U fuel cycle. Summary report2003
AbstractAbstract
[en] To deduce the resonance parameters for 232Th in the resolved resonance region, high resolution transmission and capture measurements are being performed. The measurements are performed at the Time-Of-Flight facility GELINA. A comparison of experimental data resulting from capture (top) and transmission (bottom) are shown. The transmission measurements are performed at a 50 m flight path. The neutron are detected with a 0.25' thick lithium glass (NE912) placed in an Al sphere and viewed by a 5' EMI KQB photomultiplier orthogonal to the neutron beam axis. The injection of a stabilised light pulse in the detector during the measurements provided an efficient tool to control to better than 1% the gain of the entire electronics. The experimental set-up includes a sample-changer, placed at 23 m from the neutron source, which is driven by the acquisition system. The determination of the flight path length, was based on transmission of the 6.673 eV resonance of 238U. We summarise, for the different energy regions of interest, the scheduled measurement conditions: the operation frequency of the accelerator and the target thickness. A simultaneous analysis of the data using REFIT will result in the resonance parameters from 0 to 4 keV. We show the result of a resonance shape analysis for the resonances at 21.8 and 23.5 eV. The resulting resonance parameters are important for the energy calibration and normalisation of the capture measurements in both the resolved and unresolved resonance region. The capture measurements are completed and were performed at a 60 m flight path. The sample consisted of a metallic natural thorium disc of 8 cm diameter and 1.0 mm thick, corresponding to a thickness of 3.176 10-3 at/b. The neutron flux was measured with an ionisation chamber loaded with three back-to-back layers of about 40 μg/cm210B. The gamma rays, originating from the 232Th(n,γ) reaction, were detected by four C6D6-based liquid scintillators (NE230) placed perpendicular to the neutron beam. Each scintillator is coupled through a boron-free quartz window to an EMI9823-KQB photomultiplier. The pulse height weighting technique is used to derive the capture yield. The interpretation of the data in terms of resonance parameters is in progress and will be based on a resonance shape analysis using REFITIRMM. The energy calibration and normalisation of the capture data will be based on the parameters for the resonances at and eV obtained from transmission measurements
Primary Subject
Source
Trkov, A. (ed.); International Atomic Energy Agency, International Nuclear Data Commitee, Vienna (Austria); 250 p; Dec 2003; p. 209-213; 1. research co-ordination meeting on evaluated nuclear data for Th-U fuel cycle; Vienna (Austria); 25-29 Aug 2003; Also available on-line: http://www-nds.iaea.or.at/reports/indc-nds-447.pdf; 2 refs, 2 figs, 1 tab
Record Type
Report
Literature Type
Conference; Numerical Data
Report Number
Country of publication
BORON 10, CALIBRATION, CAPTURE, ENERGY RESOLUTION, EXPERIMENTAL DATA, IONIZATION CHAMBERS, LIQUID SCINTILLATORS, LITHIUM, NEUTRON BEAMS, NEUTRON DETECTION, NEUTRON FLUX, NEUTRON REACTIONS, NEUTRON SOURCES, NUCLEAR DATA COLLECTIONS, QUARTZ, RESONANCE, SAMPLE CHANGERS, THORIUM, THORIUM 232, THORIUM 232 TARGET, TIME-OF-FLIGHT METHOD, URANIUM 238
ACTINIDE NUCLEI, ACTINIDES, ALKALI METALS, ALPHA DECAY RADIOISOTOPES, BARYON REACTIONS, BEAMS, BORON ISOTOPES, DATA, DETECTION, ELEMENTS, EVEN-EVEN NUCLEI, HADRON REACTIONS, HEAVY NUCLEI, INFORMATION, ISOTOPES, LIGHT NUCLEI, MEASURING INSTRUMENTS, METALS, MINERALS, NUCLEAR REACTIONS, NUCLEI, NUCLEON BEAMS, NUCLEON REACTIONS, NUMERICAL DATA, ODD-ODD NUCLEI, OXIDE MINERALS, PARTICLE BEAMS, PARTICLE SOURCES, PHOSPHORS, RADIATION DETECTION, RADIATION DETECTORS, RADIATION FLUX, RADIATION SOURCES, RADIOISOTOPES, RESOLUTION, SPONTANEOUS FISSION RADIOISOTOPES, STABLE ISOTOPES, TARGETS, THORIUM ISOTOPES, URANIUM ISOTOPES, YEARS LIVING RADIOISOTOPES
Reference NumberReference Number
Related RecordRelated Record
INIS VolumeINIS Volume
INIS IssueINIS Issue