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Author McGowan, F. K. ♦ Stelson, P. H. ♦ Smith, W. G.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
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)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1964-02-24
Publisher Department Oak Ridge National Lab., Tenn.
Journal Physical Review
Volume Number 133
Organization Oak Ridge National Lab., Tenn.


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