|Author||McGowan, F. K. ♦ Stelson, P. H. ♦ Smith, W. G.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||PHYSICS ♦ ALPHA BEAMS ♦ ANNIHILATION ♦ BETA DECAY ♦ COBALT 59 ♦ CROSS SECTIONS ♦ EFFICIENCY ♦ ENERGY RANGE ♦ GAMMA RADIATION ♦ MEASURED VALUES ♦ MEV RANGE ♦ NEUTRONS ♦ NICKEL 58 ♦ NUCLEAR REACTIONS ♦ PROTONS ♦ TARGETS ♦ THICKNESS|
|Abstract||Thick-target yields were measured for the Ni/sup 58/( alpha , gamma ) reaction from 4.9 to 6.1 Mev, the Ni/sup 58/( alpha ,p) reaction from 4.9 to 11 Mev, and the Co/sup 59/( alpha ,n) reaction from 5.8 to 10 Mev. The reactions were identified by measuring the coincident annihilation radiation from the induced BETA /sup +/ activities. The absolute thick-target position yields, which were measured at approximately 100-kev energy intervals, have an accuracy of plus or minus 6%. The reaction cross sections were obtained to an accuracy of 15 to 20% by the differentiation of the smooth thick-target yield curves. Over the measured energy range, the cross sections increase from 1 to 12 mu b for the Ni/sup 58( alpha , gamma ) reaction, 0.6 mu b to 316 mb for the Ni/sup 58/( alpha , p) reaction, and 0.06 to 228 mb for the Co/sup 59/ ( alpha ,n) reaction. The total reaction cross scction for Ni/sup 58/ is compared to some values predicted by optical models. The Co/sup 59/( alpha ,n) yields are compared 10 those obtained by measuring the neutrons directly with the graphite sphere detector. (auth)|
|Learning Resource Type||Article|
|Publisher Department||Oak Ridge National Lab., Tenn.|
|Organization||Oak Ridge National Lab., Tenn.|
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