Determination of the neutron resonance parameters for{sup 209}Bi from new capture and transmission measurements at GELINA

Conference · Sat Jul 01 04:00:00 EDT 2006

OSTI ID:22039467

Borella, A; Gunsing, F ^[1]; Kopecky, S ^[2]; Mutti, P ^[3]; Schillebeeckx, P; Siegler, P; Wynants, R ^[2]

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1. CEA DAPNIA/SPhN, F-91911 Gif-sur-Yvette Cedex (France)
2. EC-JRC-IRMM, Retieseweg 111, B-2440 Geel (Belgium)
3. Institut Laue-Langevin, rue Jules Horowitz 6, F-38042 Grenoble (France)

High resolution neutron total and capture cross section measurements have been performed to determine the resonance parameters for {sup 209}Bi + n. The transmission and capture measurements were carried out at the time-of-flight facility GELINA of the IRMM in Geel (Belgium). The transmission measurements were carried out at a 30 m and a 50 m flight path using Li-glass scintillators. The capture measurements were performed at a 30 m and 60 m flight path based on the total energy detection principle. The capture detection system consisted of four C6D6 detectors and a {sup 10}B ionization chamber, which was used to determine the shape of the neutron flux. A special analysis procedure, including a sample dependent pulse height weighting function, was applied to ensure that the efficiency for a neutron capture event was independent from the {gamma}-ray cascade. From a simultaneous resonance shape analysis of the transmission and capture data we deduced the neutron width for 10 resonances and the capture area for 43 resonances up to a neutron energy of 40 keV. The resonance shape analysis was performed with the most recent version of the REFIT code. This latest version includes a direct correction for the neutron sensitivity of the capture detection system and accounts for the influence of the neutron attenuation in the sample on the weighted response. (authors)

• Research Organization: American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
• OSTI ID: 22039467
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BISMUTH 209
BORON 10
CAPTURE
CORRECTIONS
CROSS SECTIONS
EFFICIENCY
GLASS SCINTILLATORS
IONIZATION CHAMBERS
KEV RANGE 10-100
NEUTRON DIFFRACTION
NEUTRON FLUX
NEUTRON REACTIONS
RESOLUTION
RESONANCE NEUTRONS
SENSITIVITY
TIME-OF-FLIGHT METHOD
TRANSMISSION
WEIGHTING FUNCTIONS