Variation in U{sup 235} mass yields at neutron energies below 0.5 ev
Conference
·
OSTI ID:4670530
Variations in the shape of the fission-product mass yield distribution curve when U/sup 235/ is irradiated with neutrons of various energies up to 0.5 ev were studied by radiochemical measurements of peak-to-valley ratios. A > 30 increase in the relative amount of symmetric fission was found at the peak of the 0.29 ev resonance compared to the amount of symmetric fission produced with thermal neutrons. A decrease in the amount of symmetric fission was observed at increasing neutron energies where symmetric fission was 18% less common with epi-cadmium pile neutrons than with those at thermal energy. At neutron energies below 0.01 ev a sudden increase in the relative amount of symmetric fission was also found, even though there is no evidence from cross-section data for a resonance in this energy region. The results of this study are compared with those of other investigations at higher neutron energies. A discussion is presented regarding implications of mass-yield variations in the theory of fission through saddle-point states. (auth)
- Research Organization:
- Phillips Petroleum Co., Idaho Falls, ID (United States). Atomic Energy Div.
- Sponsoring Organization:
- US Atomic Energy Commission (AEC)
- DOE Contract Number:
- AT(10-1)-205
- NSA Number:
- NSA-17-031391
- OSTI ID:
- 4670530
- Report Number(s):
- CONF-12--2; AED- Conf--1962-105-132
- Country of Publication:
- United States
- Language:
- English
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