RECENT DIFFERENTIAL LOW ENERGY CROSS-SECTIONS AND THERMAL EVALUATIONS
Shapes of the fission cross-sections of "235", "239"Pu and "233" were measured in the thermal and sub-thermal neutron energy regions, down to 2 meV, at the Geel linear electron accelerator, making use of a liquid nitrogen cooled methane moderator. For "235" also a relative fission cross-section measurement was done at the Very Cold Neutron Source of the ILL at Grenoble. Preliminary results of these measurements are reported, and Westcott g"f" factors based on these results are calculated. Also the shape of the "238"(n,gamma)-reaction was measured at the Geel Linac in the same experimental conditions, and preliminary results are reported. Recent evaluations of the thermal parameters for "233", "235", "239"Pu and "241"Pu and the fission neutron yield of "252"Cf are briefly commented, and the difference between evaluation results with and without Maxwellian data discussed.
Bibliographic Reference: IAEA ADVISORY GROUP MEETING ON NUCLEAR DATA FOR REACTIVITY COEFFICIENTS OF THERMAL REACTORS, WIEN, DEC. 7-10, 1987, AVAILABILITY: CEC-LUXEMBOURG, DG XIII/A2, BP 1907, MENTIONING PAPER ORA 33779 E
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Record Number: 1989126070000 / Last updated on: 1989-05-01
Available languages: en