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Author Strohal, P. P. ♦ Caretto, A. A. (Jr.)
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ ALUMINUM 27 ♦ ARSENIC 75 ♦ BROMINE 80 ♦ BROMINE 81 ♦ CERIUM 142 ♦ CROSS SECTIONS ♦ ENERGY ♦ ENERGY RANGE ♦ EXCITATION ♦ INTERACTIONS ♦ IODINE 127 ♦ ISOMERS ♦ MATHEMATICS ♦ MEASURED VALUES ♦ MONTE CARLO METHOD ♦ NEUTRONS ♦ NUCLEAR MODELS ♦ NUCLEAR REACTIONS ♦ NUCLEAR THEORY ♦ NUCLEONS ♦ PROTON BEAMS ♦ PROTONS ♦ RHENIUM 187 ♦ SODIUM 24 ♦ STANDARDS ♦ TARGETS ♦ TUNGSTEN 186 ♦ ZIRCONIUM 96
Abstract Excitation functions for the (p,pn) reaction were determined in the energy range 250 to 440 Mev for the target nuclei As/sup 75/, Br/sup 81/, Zr/sup 96/, I/sup 127/, Ce/sup 14/< s2>s, W/sup 186/, and Re/sup 187/. Both isomer products were determined in the case of the Br/sup 81/(p,pn)Br/sup 80/ reaction. Also, excitation functions were determined for the (p,2p) reaction on Zr/sup 96/, Ce/sup 142/, and W/sup 1/ s/sup 86/ and for the (p,2n) reaction on Zr/sup 96/. All cross sections were measured relative to the Al/sup 27/(p,3pn)Na/sup 24/ excitation function. The (p,pn) excitation functions are only moderately sensitive to energy showing an increase by about 30% for iodine, 20% for arsenic and cerium, and a 12% decrease for zirconium. The remaining excitation functions are flat. The ratio of sigma /sub p,p//sub n/ to sigma /sub p,2//sub p/ is 1.62 plus or minus 0.09, for the thr ee targets measured, at 440 Mev. The various mechanisms for the production of reactions of this type are examined in the light of present understanding. The suggestion is made that, despite the relative insensitivensss of these excitation functions to energy, (p,pn) and (p,2p) reactions may take place by more than one mechanism in this energy region. A comparison is made with the results of recent Monte Carlo nuclear cascade calculations applied to calculation of (p,pn) reaction excitation functions. (auth)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1961-03-15
Publisher Department Carnegie Inst. of Tech., Pittsburgh
Journal Physical Review
Volume Number 121
Organization Carnegie Inst. of Tech., Pittsburgh


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