PRODUCTION CROSS SECTIONS OF K$sup +$ MESONS BY 3-Bev PROTONS ON H, Li, AND Cu

Journal Article · Sun Dec 01 04:00:00 EST 1957 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.108.1322· OSTI ID:4338215

Baumel, P; Harris, G; Orear, J; Taylor, S

Liquid hydrogen, lithium, and copper targets were exposed to the Cosmotron 3-Bev external proton beam. Nuclear emul sion stacks were used to detect momentum-analyzed K/sup +/ and pi /sup +/ mesons of momentum 280 Mev/c leaving the target at O deg in the laboratory system. Correcting for decay in flight, the pi /sup +// K/sup +/ ratios are (630 plus or minus 11O), (290 plus or minus 48), and (304 plus or minus 50) for the respective hydrcgen, lithium, and copper tangets. The laboratory system differential cross sections for K/sup +/ production are (4.8 plus or minus 1.0) x 10/sup -32/, (3.5 plus or minus 0.7) x 1O/sup -31/, and (3.0 plus or minus 0.6) x 1O/sup -30/ cm/sup 2//sterad Mev per hydrogen, lithium, and copper nucleus, respectively. Assuming at K/sup +/ energy dependence proportional to the final state density (energy independent matrix element) the integrated K/sup +/ production cross sections are 0.21, 1.7, and 14.7 mb for hydrogen, lithium, and copper. For a matrix element proportional to the K/sup +/ momentum in the center of mass and assuming a cos/ sup 2/ THETA distribution the p-p cross section also happens to be 0.21 mb. The pi /K ratios indicate that K/sup +/ production by p-p is not suppressed significantly relative to that by p-nucleus and that the Li to Cu Zdependence of K/sup +/ production appears the same as for pi /sup +/ production. Our integrated cross sections suggest that strange particle production by 3-Bev protons occurs ~1% of the time. (auth)

• Research Organization: Columbia Univ., New York
• NSA Number: NSA-12-004410
• OSTI ID: 4338215
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 108; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ANGULAR DISTRIBUTION
ANTIPROTONS
COPPER
COSMOTRONS
CROSS SECTIONS
DECAY
ELECTRIC CHARGES
ENERGY LEVELS
ENERGY RANGE
ERRORS
HYDROGEN
KAONS
KAONS-PLUS
LIQUIDS
LITHIUM
MATRICES
MEASURED VALUES
MESONS
MOMENTUM
NUCLEAR EMULSIONS
NUCLEI
PHYSICS
PIONS
PIONS-PLUS
PRODUCTION
PROTON BEAMS
PROTONS
STRANGE PARTICLES
SYNCHROTRONS