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M. M. Bretscher, W. C. Redman
Nuclear Science and Engineering | Volume 39 | Number 3 | March 1970 | Pages 368-378
Technical Paper | doi.org/10.13182/NSE70-A19997
Articles are hosted by Taylor and Francis Online.
The effective capture-to-fission ratio has been measured for 239Pu and 235U in a low flux fast-reactor spectrum by the reactivity-reaction-rate technique. A 252Cf source and a 6Li absorber were used to measure the relative importance of fission and absorbed neutrons, respectively. The measurements were made in Assembly 24 of ZPR-9 which was designed to produce a neutron spectrum that emphasized fission and capture events in the 0.1 to 25 keV range. For 239Pu and 235U the measured values, corrected to infinite sample dilution, were 0.516 ± 0.040 and 0.337 ± 0.029, respectively. Corresponding integral alpha values calculated from ENDF/B were 0.352 and 0.346. The experimental value for 239 is in reasonable agreement with calculations based on recent differential data obtained by both the Oak Ridge-Rensselaer and the United Kingdom groups. These calculations yielded 239Pu alpha values of 0.466 (ORNL-RPI) and 0.471 (UK).
