THE COMPOUND ELASTIC SCATTERING OF FAST NEUTRONS BY LEAD-208
An attempt is made to measure the differential compound elastic scattering of neutrons of energies between 1.5 and 4.2 Mev by Pb-208 using a method based on the large dissimilarity between the energy-level schemes of Pb- 206 and Pb-208, and based further on the assumption that the shape of elastic scattering of neutrons from these two nuclei is essentially the same. The elastic differential cross sections of Pb-206 and Pb-208 for 1.52-, 1.79-, 2.03-, and 4.2-Mev neutrons were measured. The difference in the cross sections of the 2 isotopes at these energies was compared to the compound elastic cross sections of Pb-208 calculated from Hauser-Feshbach theory using the optical model to compute the penetrabilities. For 4.2-Mev neutrons, there is excellent quantitative agreement between experimental and theoretical values. At lower energies, the measured angular distributions are unsymmetricai about 90 c- , which is contrary to Hauser-Feshbach theory. It is shown that the statistical assumption of the Hauser-Feshbach theory is not experimentally fulfilled for Pb-208 below 3 Mev. (Dissertation Abstr.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-026626
- OSTI ID:
- 4702547
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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