|Author||Penfold, A. S. ♦ Garwin, E. L.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|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)|
|Learning Resource Type||Article|
|Publisher Department||Univ. of Chicago|
|Organization||Univ. of Chicago|
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