PRODUCTION OF $lambda$$sup 0$ PARTICLES IN LEAD AND CARBON BY 2.5-Bev PROTONS

Journal Article · Fri Nov 01 04:00:00 EST 1957 · Physical Review (U.S.) Superseded in part by Phys.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.108.865· OSTI ID:4347753

Mosburg, Jr, E R; Fowler, E C; Kraybill, H L

In a systematic study of 18,000 pictures taken at the Cosmotron with the Yale diffusion cloud chamber two DELTA /sup O/ decays were found having origin in a lead plate at the upstream edge of the chamber. With corrections for the geometric efficiency of the chamber and for the scanning efficiency, this leads to an upper limit of approximately 8 mb per lead nucleus for the production of DELTA /sup O/ particles. Thirtyseven nuclear interactions, found in the methane gas of the chamber, indicate a cross section of 155 plus or minus 45 mb for star production in carbon. A two-dimensional Monte Carlo calculation of the internal pion-nucleon cascade in carbon was carried out for 45 events. Computed values for the pi /sup +// pi /sup -/ ratio and for the number of emerging charged pions per event are compared with those for the experimental carbon stars. It is concluded that the Monte Carlo calculation exaggerates the cascade and thus provides an upper limit to the multiplicity of cascade-induced events. A lower limit is provided by considering only the first collision of each Monte Carlo evcnt. A count of the Monte Carlo fast internal pion collisions for which the production of a hyperon is energetically possible leads to an upper limit of 0.7 mb and a lower limit of 0.1 mb per carbon nucleus for / DELTA /sup O/ production via the intermediate pion mechanisnm. Correction by Jastrow's lead-to-carbon production ratio yields Monte Carlo cross sections for lead which indicate that this mechanism may dominate over production in direct collisions between the incoming proton and internal nucleons. (auth)

• Research Organization: Yale Univ., New Haven, Conn.
• NSA Number: NSA-12-003097
• OSTI ID: 4347753
• Journal Information: Physical Review (U.S.) Superseded in part by Phys.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 D, Journal Name: Physical Review (U.S.) Superseded in part by Phys.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

CARBON
CHARGED PARTICLES
CLOUD CHAMBERS
CONFIGURATION
COSMOTRONS
CROSS SECTIONS
DECAY
DETECTION
DIFFUSION CHAMBERS
ENERGY RANGE
ERRORS
GASES
INTERACTIONS
LAMBDA PARTICLES
LEAD
MEASURED VALUES
METHANE
MONTE CARLO METHOD
NUCLEI
NUCLEONS
NUMERICALS
PARTICLE TRACKS
PHYSICS
PIONS
PLATES
PRODUCTION
PROTON BEAMS
SCATTERING
SYNCHROTRONS
TARGETS
THICKNESS