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Author Penfold, A. S. ♦ Garwin, E. L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS AND MATHEMATICS ♦ ABSORPTION ♦ BREMSSTRAHLUNG ♦ CARBON 12 ♦ CROSS SECTIONS ♦ ENERGY RANGE ♦ GAMMA RADIATION ♦ LIFETIME ♦ MEASURED VALUES ♦ MEV RANGE ♦ NUCLEI ♦ OXYGEN 15 ♦ OXYGEN 16 ♦ PHOTONEUTRONS ♦ RESONANCE ♦ WIDTH
Abstract ABS>The importance of narrow, isolated, resonances in the photonuclear absorption cross sections of C and O was investigated by means of an absorption experiment performed with 30.7-Mev bremsstrahlang. The experiment yielded values for the cross sections averaged over the ( gamma ,n) cross sections for C/sup 12/ and O/sup 16/. The results for C were the same as those expected for a cross section without narrow resonances, while for O a definite resonance effect was demonstrated. The O photonuclear absorption cross section, averaged over the O/ sup 16/ ( gamma ,n)O/sup 15/ cross section, was found to be 26.7 plus or minus 3.5 millibarns, l6 plus or minus 4 millibarns higher than the value expected if narrow resonances contribute insignificantly. Estimated values for the parameters of the O resonances near 22 Mev arei average peak height, 106 plus or minus 14 mb; ratio of the radiative width (to ground state) to total width, (6.6 approximately 0.9) x 10/sup -3/; total width about 30 kev. The experimental results are insensitive to uncertainties in the non-nuclear x-ray attenuation cross sections for C and O. (auth)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1959-06-01
Publisher Department Univ. of Chicago
Journal Physical Review
Volume Number 114
Organization Univ. of Chicago


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