Title: Determination of the Neutron Resonance Parameters for 209Bi from New Capture and Transmission Measurements at GELINA
Authors: BORELLA ALESSANDROGUNSING FrankKOPECKY STEFANMUTTI P.SCHILLEBEECKX PETERSIEGLER PETERWYNANTS RUUD
Citation: 2006 Conference Proceedings of the American Nuclear Society's Topical Meeting on Reactor Physics vol. B043 p. 1-10
Publisher: American Nuclear Society
Publication Year: 2006
JRC N°: JRC36257
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC36257
Type: Contributions to Conferences
Abstract: High resolution neutron total and capture cross section measurements have been performed to determine the resonance parameters for 209Bi + 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 10B 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.
JRC Institute:Institute for Reference Materials and Measurements

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