ELASTIC AND NONELASTIC NEUTRON CROSS SECTIONS FOR BERYLLIUM
A time-of-flight technique was used to measure angunlar distributions for the elastic scattering of neutrons from beryllium in the energy range from 2.6 to 6.0 Mev. Total neutron cross sections were also measured and the following nonelastic (total minus elastic) cross sections obtained: 2.60 Mev (0.27 plus or minus 0.13 barn). 3.50 (0.43 plus or minus (0.73 plus or minus 0.07). Differential cross sections were also obtained for the inelastic neutrons leaving Be/sup 9/ in the 2.43Mev excited state. integration of these angular distributions yielded the following inelastic cross sections: 3.50 Mev (0.23 plus or minus 0.04barn), 4.10 (0.25 plus or minus 0.04). and 5.00 (0.34 plus or minus 0.05). A continuous spectram of neutrons was observed which corresponds to the direct (n,2n) reaction and/or the excitation of the Be/sup 9/ level'' at 1.7 Mev. This continuum was found to have an angular distribution roughly symmetric about 90 deg . The 2.43-Mev state of Be/sup 9/ was found to decay by neutron emission to the ground state of Be/sup 8/ with a branching ratio of 12 plus or minus 5%. (auth)
- Research Organization:
- Los Alamos Scientific Lab., N. Mex.; and Univ. of Maryland, College Park; Los Alamos Scientific Lab., N' Mex.
- NSA Number:
- NSA-13-022912
- OSTI ID:
- 4227515
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 114; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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